Home Ctrl 28 User Manual - The Klaus Pintoffl Home Page
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1. Eight Control Arduino was the first release and can be seen as an entry level internet based home control system Home Ctrl 28 in contrast is an advanced multi user system offering server sided user right administration up to 16 different user keys 28 control functions real time clock functionality multiple profiles and more Home Ctrl 28 operation is easy and error free for the USer In this manual the User is a person using an Android device to control functions on the server The Administrator is the person setting up the server even if the Administrator is often also a User The Home Ctrl 28 mobile application and server software is the result from experience with Eight Control the additional features suggested by users and my own expectations for this product I thank all the users who helped with feedback and suggestions on Eight Control A Home Ctrl 28 system not only offers the possibility to control devices at home over the Internet at a price well below comparable systems It also is a fantastic learning tool for new Arduino users and offers the possibility to add and modify the server program for advanced users to fit almost everybodys needs 2 Features This section contains general information on Home Ctrl 28 It is designed to get some basic information about the system You do not have to understand everything here it will be explained in detail in the next chapter 2 1 Is it safe The transmissio2. format KeyA 30ghjzt45d KeyB 4dfdhuiG887 Key5 AbCdEf Key8 8 4 2 3 Functions for each User Next the functions that each configured user can execute are set User A has 6 buttons on his user interface According to the pin table he can switch the output pins 22 23 24 31 32 and 33 on the Arduino Mega board FunctionsA 1 2 3 10 11 12 FunctionsB 1 2 3 10 11 12 13 17 18 19 22 Functions5 1 2 3 10 Functions8 1 2 3 11 At this point a small example should be done I have used the following Settings txt file Settings txt New Volume media New Volume gedit x T all 14 17 File Edit View Search Tools Documents Help Fight Control m Open Ra Save Settings txt l IP 19 168 178 Function 1 Function 2 MAC 0x60 0XA3 0xD5 0x00 0X6F 0x22 Port 80 Gateway 192 168 2l 1 Subnet 255 255 255 6 KeyA A KeyBR B Function 3 Function 10 FunctionsA 1 7 3 10 FunctionsB 1 2 4 Illustration 23 Example of a Settings txt file The keys are not save but OK for testing User A can expect to have 4 buttons on the UI Illustration 22 The result is like expected if Network Settings for User A are entered correctly Functions have their default name as none was set yet User A decided to use the Green Fruit profile 4 2 4 Function names In the example above the functions on the User Interface show their default names It is possible to use more meaningful names instead Again this is done with the
3. Settings txt file Settings txt New Volume media Nev A wox File Edit View Search Tools Documents Help Eight Control n F Open wv Save Settings txt 3 IP 192 168 2 178 MAC 0x68 0xA3 0x05 0x00 Ox6F Ox22 Port 80 Gateway 19 7 1 Subnet 255 25 Garage open KeyA A keyB B Garage down Arduino pin 31 Functions 1 2 3 10 FunctionsB 1 2 4 Namei Light Name Garage open Name3 Garage down Namei Arduino pin 31 Illustration 25 The updated Settings txt file includes now function names Illustration 24 Function names are now displayed as set up on the server 4 2 5 Function delays Every function can have a delay on the server which is set in seconds After this time the corresponding pin automatically goes to off The maximum number is 32767 seconds which is a little over 9 hours In our example the relays to open the garage and close the garage should only switch on for 10 seconds We can add the following 2 lines to the Settings txt file Delay2 10 Delay3 10 Functions 2 and 3 switch now off 10 seconds after executing them However the buttons on the User Interface phone will remain on They do not know that the server has meanwhile changed the state to off If any button is pressed or the application is reopened of course all button states are refreshed again To solve this issue function Properties can be used 4 2 6 Function properties We would like the Garage open and Ga
4. character of a function property is set to r Enter Code 3654 3654 Illustration 8 Function Properties for this function set to r for the 2nd character fEREEREEREEREEE TERETE EER EEE EER EEE EER EER EER EER EER EER EEE EERE EEE EER EER EER EEE EEREEEEEREEREEREED Function Properties Chari n SaveState off y SaveState on Char2 n none c confirm r randon p pin Char3 n no delay s dsec delay l 8sec delay EEEEERREERERREER ERR EEE RE EERERR EER ER EEE ERE REE EERE RE EER ERE ER ER EERE ERREREEEEEREEEREREEERE f Illustration 9 Function Properties Three characters determine the behavior of a function The Properties are set on the server but transmitted to the clients They can be visualized on the user interface when the option Show Function Properties is set in the application settings 2 5 Advanced features Until now it was explained that Home Ctrl 28 can control 28 functions micro controller pins which can be connected to relays From user feedback on Eight Control I was aware that there is a need for timer functions as well as the ability to control additional parameters on the server as well as improved flexibility in displaying readings data from the server 2 5 1 Time and Alarm functions Sync Time and Alarms to Server Daily New time Weekday Last time Weekend off Single Time 1 on Time 1 off Time 2 on Time 2 off Stop this Alarm Sync Time Set Alarms Cancel cy 21 50 3 5 a
5. the Arduino Mega board Every user can control up to 16 functions of these 28 So Users can share functions or can be the only one to be able to switch a function Looking at the same settings file again User A was allocated functions 1 2 3 10 11 12 User C was allocated more than 16 functions which is not possible as the limit is 16 per user the last two Functions 27 and 28 are ignored by the system in this case On the Android device the allocated functions show up with their names if names have been set see later If no name was set the function displays as Function and number like Function 12 FERELETELETERTELRELELELERELETERTELE ERE EREELEEER EER EERE EER EEL ERE TEER EEEEEER EERE EERE EEEEER Function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Pin 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 EEEEEERTERTEEREEELEER TELE EEE TERE EEREEEREEEREEREEEREEEE i Illustration 5 The Pin table It shows which function number 1 to 28 switches which output pin on the Arduino Mega All of these pins are located on the right side of the board Settings txt Desktop gedit Tools Documents Help _ Settings txt IP 192 168 1 5 MAC 0x90 xA2 OxDA 0x00 Ox8F Ox52 Port 50022 Gateway 192 168 1 1 Subnet 255 255 255 0 KeyA 30ghj zt45d KeyB 4dfdhuitGas7 keyC 30023 KeyS AbCdEf Keys 8 Namel Light Name Door Name3 Garage Namez 0 20
6. 7 18 19 22 FunctionsC 1 2 3 10 11 12 15 8 16 18 19 22 23 24 25 26 27 28 Functions5 1 2 3 10 Functions8 20 21 22 23 FunctionsD 20 21 22 23 Illustration 2 The blue mark shows AES keys set for Users A B C 5 and 8 These users have to enter the same key into their Android device mM F all 19 02 Eight Control Illustration 3 The user can protect the app with a pin code 2 2 Three Network profiles for each client Each Network Profile can be configured to connect to one server As an example a user can connect with his Android phone to 3 different servers To a server in his home to one in his weekend house and to a third server in his company Each profile has a name containing the color Green Fruit Blue Moon Orange Star and function buttons of the same color A user can choose which profile color he likes best for which server Once a profile is selected four network settings for this profile can be made Server IP Address Server Port User and AES Key These settings are of course remembered for this profile all E 16 21 Connect to home 1 Profile Selector Which Profile do you want to Connect to use 2nd home Connect to company Illustration 4 Profile selector Each Profile can be used to connect to a different server 2 3 The number of functions that can be controlled Home Ctrl 28 can control a total of 28 server sided functions which means that 28 relays can be connected to the output pins of
7. E Illustration 10 The time Alarm dialog is started by pressing the clock icon on the Title Bar or in the option menu In this example a weekday alarm is set to 7 17 am A user can do the following things e Set up an daily alarm weekday or weekend alarm or an alarm that goes off only once The alarm will turn pin 6 high on the Arduino board for 300 seconds or until disabled by pressing the Stop this Alarm button e Set up a daily on and off time 1 For the time interval between the 2 times pin 7 of the Arduino board will be high otherwise low Both Timer1 on and Time off have to be on e Set up a daily on and off time 2 For the time interval between the 2 times pin 8 of the Arduino board will be high otherwise low Both Timer2 on and Time2 off have to be on e Sync the RTC real time clock of the server to the current time and date of the mobile device Only Users A to F have the Sync Time button available Time 22 02 59 Date Tu Jan 1 2013 11 53 7 15 10 10 0 19 12 00 15 00 21 28 1 10 Edit ea 22 03 3 F ll E Illustration 11 This dialog is displayed after pressing Set Alarms or Sync Time from the previous dialog It displays server time date from the server RTC and the alarm status Red entries are in the on state The Edit button takes the user back to the previous dialog Server Time 22 11 17 Test Value Server Vcc Volts 332 Temp DS18820 1 Deg C 20 3 Tem
8. Home Ctrl 28 User Manual Table of Contents t Thetunny and tue Introductio Mess O E R ERES 3 Dig MANE CS Secret iss TEE esac ncaa 5 ZEE AIE e E E T AET EE EAA 5 2 2 Three Network profiles for each client cccccccccccssssscessnsssssscsccceccccccccccseeeueccceesssssssesessececceceeenes 7 2 3 The number of functions that can be controlled neeeneeenesenssesesesseesssesssesssessersssrssersserssersessessess 8 2 4 First intrOduction tO FUNCTION properties eiiie n AiE T EN E AA Ea 10 DAS Ad ANC OCI ea E eaa at canae oe anomie caste resaaumenmueconmeioemee 14 25 k Dime md Alam UNCON nasia a Soave aa a a dl cecheceabie suas cited 14 2 52 DELVED Teada Seea A A T E 16 DD PTO De E EA E T 17 2 6 The difference between Admin Users A F and Normal Users 0 9 ccce cece eeeccesccsscesccesceeees 18 2 5 3 Customization Of server SOLEW Al CiesicdeneiycGuvesssevasnsuveteuscossetuesdsavieenteeeenaupniusessusieduegeaeeeuncxeumee 19 Be Wilat the U Ser Ras to KINO Wasiacisesosc2iiess casuals a a te att date 20 AW at the Administrator NaS tO KNOW cegcicisats desttou casatesesccsusoeRebctentNces e a lace T A aE 22 AAwa e SeU Dan a a a a a a a O aa 22 Aki Tea UME COCK eea a E N 23 A Tempera Ure SENSO Srian a E ETEA 24 REC Saa Ea a E ee eee ie 25 Al AACHVY CIC ALON GE Dirse R N S 26 a A E S Wl E N EA S E E S E ee TMC EAS E tee mien T 26 A2 LNetwork parimet S eaa E E E E N 27 4 22 The AES key S hior the USES acennu O 28 42 Functi
9. None Name21 21 Confirm Name 2 2 Random Name23 23 PIN Delayi 3 Delay2 3 Propertiesi nns Properties2 ncl Properties3 nrn Propertiesi0 ypn Properties2 nnn Propertles6 yrs Properties20 ynn Properties 21 ycn Propertiles22 yrn Properties23 ypn FunctionsA 1 2 3 16 11 12 FunctionsB6 1 2 3 10 11 12 13 17 18 19 22 FunctionsC 1 7 3 16 11 12 15 8 16 18 19 22 273 274 25 26 27 28 Functtons5 1 2 3 10 Functtons8 20 21 22 23 FunctionsD 27 21 22 23 Illustration 6 The blue area shows that User 8 can use functions 20 21 22 and 23 The user interface on the phone shows the corresponding function names not the numbers T was e S yll 20 15 Eight Control 20 None 21 Confirm 22 Random Illustration 7 The device of User 8 shows the 4 functions with their names Function 20 top left was named 20 None by the administrator This given name seems to make no sense but later it will be shown that every function can have certain properties The names None Confirm Random and PIN are given in this case to demonstrate these properties security dialogs see below 2 4 First introduction to function properties First things first As User you do not have to care at all as the Administrator has to care for them As Administrator of an Home Ctrl 28 server You do not have to set up Properties For the simple scenario one press of the function button switches the function relay on another press switches the function of
10. are images of all 3 protection types determined by second character ml A 18 11 aml A 18 11 f p e gil A 18 12 Enter Code 3518 Enter PIN Code Confirm action m Illustration 27 Confirm dialog Illustration 28 Random dialog Illustration 29 PIN dialog 4 2 7 User PIN codes The PIN codes are specific for each User One PIN can be set for each of the 16 Users For every function that is PIN protected all users has to enter their individual PIN code There is no way to have different PINs for one user The PIN can range from 1 to 32767 Preceding zeros will be ignored If the PIN is outside of the mentioned range malfunctions can occur To set a PIN for User A and B enter PINA 1234 PINB 3333 This is our final Settings txt file I also passed a PIN to User B even if this user does not have a PIN protected function by now Please take a look at the last line Update 3 This line is optional Read about the meaning in the next paragraph Settings txt media New Volume gedit File Edit View Search Tools Documents Help R eoo Bo 5 Settings txt EightControl_Pro_12_Dec_27 IP 192 168 2 178 MAC 0x 0 0XA3 0XD5 0X00 X F X Por t 80 Gateway 192 168 2 1 Subnet 255 255 255 6 KeyA A KeyB B FuncttonsA 1 2 3 106 FuncttonsB 1 2 4 Namei Light Namez barage open Name3 Garage down Namel Arduino pin 31 Properties2 npl Properties3 nnl PINA 1234 PINB 777 Update 3 Illustrati
11. d at all Phone or tablet style Changes the arrangement of buttons to be displayed in one row phone or 2 4 rows depending on tablet style orientation Button Click Duration Some users want to avoid to accidentally press a function button If selected a long press is needed to switch a function Show properties Function properties set on the server can be displayed on tablet style or beside phone style a button The default property is which means no SaveState no key protection and no auto off is set Application code set a protecion code for the application This way you can borrow your phone to somebody without having to fear he will use Home Ctrl 28 Use Application Code Enable the Application Code If the user forgets the code it is necessary to completely deinstall and reinstall the application and re enter connection data Auto refresh interval If set to other than No Auto Refresh the device will periodically connects to the server It will not switch to standby and therefore an external power supply is recommended Auto Close closes the application some seconds after switching a function A t al B Network Server IP Address 10 23 At Application gil B 10 23 Phone or Tablet style Server Port Button Click Duration User Show Properties elect tn Function Properties visible SaveStat AES Key Application Code Use Application Code Auto Refresh Interva n ADD p
12. en 1 ction update p i nctUon oje Auto Close Program Illustration 15 Network settings are Illustration 16 Application settings the only necessary settings for the are advanced options and there is no User need to change them 4 What the Administrator has to know 4 1 Hardware setup Home Ctrl 28 needs an Arduino Mega board The Arduino Mega or compatible board as well as an Arduino Ethernet Shield are the basic requirements Alternatively an EtherMega board can be used which houses the Micro Controller Ethernet port and card reader on one board For how to program the Arduino and connect relays I will refer to the Arduino Eight Control website The only difference to mention is to select the correct board in the Arduino IDE and the different output pins to connect to relays FEEETETELATERTELETELTEEREEELEEEEEER EERE EEREELEEEE EEE EEREEER EEL EER EERE TERETE EERREEERERESER Function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Pin 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 EEREEELEERTEEREEELEEREEEEEEE TEER EEREEER EEE EEREEEREEEEEEREEEREEREEEREEREE ERE EER EEEEEEREEEEESE Illustration 17 The Pin table It shows which function number 1 to 28 switches which output pin on the Arduino Mega All of these pins are located on the right side of the board Optional hardware is a DS 1307 based real time clock module one to four DS18S20 temperature sensors a
13. f No function properties are needed 1 But if a function triggers a door opener The User presses the button for Door function 2 The relay for function 2 closes for 3 seconds then switches off like specified in the Settings file Delay2 3 But the button on the user interface Android phone would still show on because there was no reconnection to the server This is confusing The function properties can bring the Android button back to off state automatically after 4 or 8 seconds 2 You have a very sensitive function like opening the door to your company Would you like your employees Users to play around with their phones and accidentally open the door If no the function properties can require the user to enter a PIN code a client generated random number or at least a confirm dialog before the Users can open the door 3 You want to switch on and off a fridge in your second home to have some cold beer when you arrive How do you tell your server to remember the on off state of the fridge even in case the power drops out You can use the function properties and set the SaveState property Function properties are set up on the server Settings txt file They look like below where Properties1 sets the Properties for Function 1 Properties1 nns e The 1st character can be y yes or n no It determines if or not the server remembers the state of a function if the power drops out or if the server is res
14. mperature reading can be returned from a simple function call Pro Tab makes it possible to transmit any value from a phone to the server It is obvious that the same controller board can be used to do a lot of additional things much more than is currently implemented From Eight Control some customization examples users suggested were Switch an additional output pin according to temperature Transmit a temperature value to and from the server Time control output pins Have an all off macro button on the user interface All these wishes are too specific to be included a priori It is a feature of Home Ctrl 28 to have open source server code and therefore be able to customize the application I will not be able to do this for everyone but will help as good as possible in getting the idea how to do this and where to place the additional code in the server software 3 What the User has to know The user first loads the profile selector from the option menu and selects a profile he wants to use usually based on his color preference Then he sets IP address Port number User and AES key from the option menu gt Settings gt Network Returning from the settings menu the application automatically connects to the server transmits the function names and displays the button states There are additional setings under option menu gt Settings gt Application They are explained in detail below but do not need to be touche
15. n between server and clients is secured by AES128 That means the keys can have up to 16 characters 128 bits The server supports 16 different AES keys so 16 users named A to F and 0 to 9 can have a different key There is also a measure to prevent a third party from stealing commands sent between clients and server Both sides pack random numbers into their data If on the returning signal this random numbers have changed the commands are ignored In summary the transmission is comparatively safe Much safer than a physical key The whole mobile application can additionally be protected by a pin code The image below shows how AES keys for 5 users are set on the server configuration file Each user enters his AES key into his mobile application at configuration Settings txt Desktop gedit File Edit View Search Tools Documents Help aa Open v iv Save 3 Settings txt 3 IP 192 168 1 5 MAC 0x90 OxA2 OxDA 0x00 O0x8F 0xS2 Port 50022 Gateway 192 168 1 1 Subnet 255 255 255 0 KeyA 30ghjzt45d KeyB 4dfdhuiG887 KeyC 30023 KeyS AbCdEf Key8 8 Namei1 Light Name2 Door Name3 Garage Name20 20 None Name21 21 Confirm Name22 22 Random Name23 23 PIN Delay1 3 Delay2 3 Propertiesi nns Properties2 ncl Properties3 nrn Propertiesi10 ypn Properties20 nnn Properties6 yrs Properties20 ynn Properties21 ycn Properties22 yrn Properties23 ypn FunctionsA 1 2 3 10 11 12 FunctionsB 1 2 3 10 11 12 13 1
16. nd a small active buzzer for the alarm ra m R tipoy Ira yt i Hi Illustration 15 EtherMega 2560 board running Home Ctrl 28 software Connected is a RTC module SDA on pin 20 SCL on pin 21 and an active buzzer pin 6 Even without any relays connected this already makes up a network controlled alarm clock for daily weekday weekend and single alarm A small battery on the RTC board remembers the time the alarm times are stored in EEPROM memory 4 1 1 Teal Time Clock A DS 1307 based real time clock module is readily available for the Arduino platform It has a size similar to a stamp and a small battery which keeps the time up and running for several years There are several RTC software libraries available for the Arduino platform In most code examples the compile time time when the project is sent to the Arduino is used to set the clock Other examples use hardware buttons and LCD shields The RTC uses the 12C bus system Home Ctrl 28 takes the approach to be able to synchronize the time to the time of the Android device This is a procedure actively performed by Admin users Ato F from the Time dialog Users O to 9 are not able to perform this task although this can be changed in the server code If the time or any alarm time is changed the server time is displayed in the dialog If no RTC is connected on the server the time can of course not be correctly displayed Apart from that the server works normally Theref
17. o the server Administrator to implement this in code Pro Tab is in an early development stage and the next step could be to make it possible to constrain the values transmitted as bytes i e to for example constrain 0 to 255 to 18 to 25 degrees and show these values and their meaning on the UI Pro Tab is available to Users A F and not to Users 0 9 2 6 The difference between Admin Users A F and Normal Users 0 9 When the User sets up the mobile account consisting of IP Adress Server Port User and AES key he notices that the User can be Admin A to F and User 1 to 9 and 0 There are only a few differences Admin A to F accounts include the possibility to sync server date time to the phone time and can display the Pro Tab Normal Users 1 to 9 can not do theses 2 things However this behavior could be changed by the server administrator modification of server software 5 T all 22 55 User Admin D Admin E Admin F User 1 User 2 User 3 Cancel Illustration 14 The setup page for the user Only if the correct user is entered the server can correlate it to the correct AES key 2 5 3 Customization of server software From the 256 KB of Flash Memory that the Arduino Mega has less then 25 are used There are also a couple of free I O pins available the reason for Home Ctrl 28 to only use 28 output pins There is built in support for up to four DS18S20 temperature sensors and if connected their te
18. on 30 Remember that the PIN must be 1 to 32767 The last line is the version of the Settings txt file Changing it causes all clients to reload function names and function properties 4 2 8 Update parameter optional In the last Settings txt file the last line was Update 3 This represents the version of the file Whenever this number is changed all connecting clients are forced to reload function names and function properties The users could do that manually as well from options menu but how should he know when it is required If a user gets an additional function or gets a function removed the client refreshes function names and properties in any case If however the function number did not change the client only refreshes automatically if the Update number is different from that of the last connection function execution or if the Administrator calls the User by phone and tells him to press the Sync Fn Names button in the option menu The Update parameter can be 0 to 255 It does not matter to which number the Administrator changes it e g from 3 to 4 from 3 to 2 from 3 to 255 It only has to be different from the previous version so that the clients software knows Different version I have to update
19. ons FOF each Usei orrera a a 28 7a E EEEE EEIE E EE OA T AE A ANEN E A O E EEE AA A E T aaa dar 29 AeA PUn CHONN WIL OS ai a O O 29 AD eo WIN EE E GS A E A EA EE A E E E A 30 AZ TUNC DEO DEL LES ays tahexos E E N ea ouedueieieneateneeeeuareaanetes 31 a ae oe Wc E al Wh Ea E EAEE EOE AOAO nO PW ee en enon On ee een 32 2 6 Update parameter OpulOnal sonses caisicandacacseennistinasd aeusenadiatancemeaeaeeaee 33 1 The funny and true introduction Switching on turns on this light E 4 i h s a T OF I c j St Y We PAAS I 7 ai f ir f TA AN meek Doe at SEs os a if 7 128 a i018 Coe E ta eS Lt Em JE 1 Az tif h 1 Illustration 1 An electrical interference as stating point for building a home control system A view days before Christmas 2011 I was cooking and once again this tiny stylish touch dimmer light went on together with the cooking hood I just turned on The difference on this day was I decided to leave it on for the evening for some additional Christmas atmosphere I decided that for this evening this behavior was planned It is home automation Arising from this some questions came to my mind Can I make it more predictable Increase the range Use a second hood to switch the light off would I have room Can this be used for other lights Can one bring this to marked Some days later I decided for a completely different approach An Android and Arduino based home control system
20. or editing the file and then placed back into the server The server has then to be restarted by pressing the reset button or pulling the power cord out for a second The SD card can only contain one Settings txt file but may contain other data as well New Volume File Edit View Go Bookmarks Help minenn New Volume u New Volume i Bookmarks gt sucrat workspace il i Settings F txt SettingsWork bet cubret LOST BIR Settings txt Computer Home Illustration 21 The content of my SD card Only the Settings txt file will be read The spelling must be correct The text of the Settings txt file is used to configure the behavior of the server It is organized in lines It does not matter if empty lines are contained There are no spaces allowed between beginning and end of each line except when a function name itself contains spaces like Name1 Press me The Settings txt file contains the following parts where the order of the parts or lines does not matter 4 2 1 Network parameters The IP address has to be the internal one not the external IP the external IP has to be entered into the client if connection is planned over the Internet IP 192 168 1 5 MAC 0x60 0xA3 0xD5 0x00 0x6F 0x22 Port 50044 Gateway 192 168 1 1 Subnet 255 255 255 0 4 2 2 The AES key s for the User s Also here no spaces on either side of the sign Here keys for Admin A Admin B and User 5 and 8 are set Use the following
21. ore there is no need to connect a RTC if the time and alarm options are not needed Four wires have to soldered to the RTC recommend the usual and inexpensive flexible jumper wires and cut off their edges on the battery side of the RTC Then 5 Volts and ground can be connected easily to the socket of the Ethernet Shield or Arduino Mega The SDA connector has to be connected to pin 20 SLC to pin 21 The RTC can be glued to the Arduino board with a double sided gluing strip See image above SINPoW JLy Illustration 18 A RTC module Flexible jumper wires can be soldered to the board This is the only situation where soldering is needed in the project The SQW pin is not needed in this project There is a link to the board on sparkfun https www sparkfun com products 99 4 1 2 Temperature sensors Of course many temperature sensors can be connected to Arduino boards choose the DS18S20 because it is well Supported and often used in forums so that example code is available Also as this sensor transmits digital signals instead of temperature proportional voltage it should be less dependent on cable properties and length The sensors look like transistors but they are micro controllers They have an electronic ID and this way it is possible to have more sensors on the same bus system in a parallel order used a small breadboard to wire up everything There is a good image on http bildr org 2011 07 ds18b20 arduino
22. p DS18S820 2 Deg C 20 1 Temp DS18S820 3 Deg C Temp DS18820 4 Deg C 19 3 Update Sync V Names ey 22 11 3 L Illustration 12 The Server Data dialog displays all values configured on the server It would not difficult to change the server code to selectively display values to individual users 2 5 2 Server readings When pressing the chart symbol in the action bar or option menu on Android 2 xx devices the Server Data dialog pops up It is easy for the Administrator to modify the server code to display values selectively to Users The server software has built in support for up to 4 DS18S20 one wire temperature sensors The server has 16 analog input pins that can deliver analog readings of 10 bit precision The number of values that can be displayed is not limited as the dialog window contains a scroll view 2 5 3 Pro Tab Boolean Values Integer Values 0 255 99 101 ey 22 22 3 F aE Illustration 13 The equalize symbol in the action bar or option menu brings up this dialog Pro stands for Professional or Programmer The values set in the Pro Tab by toggle buttons sliders and EditTexts are transmitted to the server and stored in EEPROMs and are therefore accessible like global variables They are however not used on the server in any way and have no connection to the 28 output pins The idea is to use the values to for example set up a temperature for a heating system It is fully up t
23. rage down button to return off automatically after 4 seconds Also the opening of the garage should be protected by a PIN code The Administrator has to set function Properties for function 2 Garage open and function 3 Garage down fEEEREEREEREER EERE EER EEE EEL EEE EER EER EER EER EER EEE EEE EEE EER EEE EER EER EER EEE EER EEEEELEEREEREED Function Properties Chari n SaveState off y SaveState on Char n none c confirm r random p pin Char3 n no delay s dsec delay l 8sec delay EEERERKLERERREER ERE ERREREEERERR EER ERE ERE ERE EERE EER EREEER ER EERE EERE EEEEREEERERREREE f Illustration 26 Function Properties Three characters determine the behavior of a function Properties2 npl Properties3 nnl For function 2 Garage open the first character n means no SaveState The status of the pin does not have to be remembered So After a restart it will always be off The second character p requires the user to enter a PIN code when opening the garage We will set up a PIN which is specific to a user not to a function in the next chapter The 3rd character 1 stands for long delay The button on the user interface not the relay on the server which is set with the Delay2 10 line will auto release after 8 seconds For function 3 Garage close the 1st and 3rd character are the same However the 2nd character none means that no kind of confirm dialog pin random or confirm are required when closing the garage Below
24. tarted if set to y the on off state is being written to an EEPROM and restored If no function property is set for a function this function is always off after restart or power down e The second character can be n none c confirm r random or p PIN It determines what a user has to do to switch this function If n the User can just press the button and switch the function If c a confirm dialog prompts the User to confirm the action If r the User is confronted with a dialog that needs him to enter a displayed 4digit random number an absolute measure against accidentally executing a function The correctness of the entered number is checked on the client If p is set the User has to enter a PIN code into a pop up dialog The correctness of the PIN is checked on the server An measure to exclude that the wrong user executes the function A PIN code can be set for each user not for each function e The 3rd character can be n none s short or long If set to none the User button on the phone tablet has the usual on off behavior If s is set the client button automatically goes to off state after 4 seconds And if IP is selected it goes to off after 8 seconds That is the whole magic of the function properties that always consist of 3 characters A full table of the options will be given in the next sections Below is a screenshot of the random number dialog that appears if the second
25. that displays how to connect the DS18S20 G FP Fa F A A Illustration 19 Image displays connection of DS18S20 The black wire is going to Arduino ground the red one to 5 Volts The orange one is connected to pin 2 The resistor has 4 7 kilo ohms yellow violet red and tolerance 4 1 3 Relay cards There a many products on the marked that can be used It has to me mentioned that the Arduino can not directly drive a relay Suitable relay cards contain components to avoid this current overload and therefore the cards require a power supply Below is an example of the ones I use There are also SSD relays available that do not contain moving parts Usually their current load is lower but sufficient for many purposes Illustration 20 A typical relay card that can be used for Arduino A card like this should cost below 10 Euros A power supply has to be connected Take care not to take this power supply from the Arduino pins their current is limited 4 1 4 Activity indicator LED A simple LED can be connected to pin 9 via a resistor of about 1200 Ohms The LED will blink every second after the server has read the data stored on the SD card successfully 4 2 Settings file The Ethernet Shield contains a card reader for a micro SD card On this card the Settings txt file has to be contained If the server is installed somewhere and the server configuration has to be changed the card can simply be taken to a PC f
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