User Manual
Contents
1. Decide if you want to use the normal serial lines DO and D1 or two of the other I O pins DO and D1 are shared with the USB port to the development PC If you use the standard lines you must remove G2 when you upload a new sketch program into the Arduino Put G2 back in after the upload is complete press the Reset switch and the Arduino will communicate properly with the ATS 1 If you wish to use other pins and leave DO and D1 dedicated to the USB port read the section on Using Software Serial UARTS 2 Plug the ATS 1 into the Arduino compatible host Connect the USB cable and start programming 4 Trimmer R1 mounted on the bottom of the board is used to adjust the display contrast It is set at the factory but we can be adjusted by the user if needed 5 Decide if you want to use the LED back light on the display The backlight makes viewing easier in dark locations but requires more power This can be an issue if your project draws a lot of current especially if you are powering it off the USB port which is limited to 5 00ma Remove jumper G3 to disable the back light You might need to re adjust R1 for best viewing Programming information It is assumed that the user is familiar with the Arduino Serial functions More information is available at the Arduino web site Www arduino cc Before the Arduino can communicate with the ATS 1 the serial port must be set up Be sure the Serial begin 4800 statement is in the setup function at2. available on the Arduino web site Look for Soft Serial or Software Serial in the contributed libraries in the Arduino Language Reference pages This software allows you to specify two pins for an additional serial port You can pick two unused digital I O pins and use these to communicate with the ATS 1 Software UARTs may require additional software considerations Read the documentation with the software UART library and account for any limitations in your applications To use I O lines other than DO and D1 perform the following steps a Remove jumpers on G1 and G2 b Solder a wire from the pad labeled TX next to G1 to a pad connected to J3 or J4 c Solder a wire from the pad labeled RX next to G2 to another pad connected to J3 and J4 d Follow the software UART s instructions for specifying the pins used for TX and RS TX is data LCD LED Buzzer sent from the Arduino RX is data switch received by the Arduino Note Soldering or other modifications to the ATS 1 may void the warranty It is recommended you test the ATS 1 on the standard serial lines before attempting to use alternate ones Using the ATS 1 with Non Arduino Systems The ATS 1 can be used with other microcontroller system hosts You will need to provide 5V DC for power plus connect to the serial lines of the host system Power and ground can be supplied through pins 2 and 3 of connector J5 If you are powering the ATS 1 from a separate supply from the host be
3. UM S cms ATS 1 User s Manual Microsystems Revision 3 00 For Revision C Assembly February 2015 Overview The ATS 1 is an Arduino compatible shield that acts as a small terminal Long time computer developers who used dumb terminals will be familiar with this concept The ATS 1 features a 16X2 LCD 6 navigation switches user controllable buzzer and LED and a master reset switch It plugs into Arduino Uno Duemilanove and other CPU modules with the same foot print The ATS 1 communicates with the host through only two serial lines leaving the rest of the I O lines for the use by your application The ATS 1 normally uses the DO and D1 lines but can be configured to use any two of the other digital lines Communications with the ATS 1 is done using the standard Arduino Serial write Q Serial print and Serial read functions Specifications Size 4 0 X 2 35 Power AST 1 5V at 150ma typical 15ma with LED backlight disabled supplied by Arduino host Communications Serial 4800 Baud No parity 1 stop bit 5V TTL UART signal levels not RS 232 Features LCD 16 X 2 characters Switches 6 navigation communicate with Arduino host Reset Resets both ATS 1 and host Arduino LED red controlled by software Buzzer controlled by software Contrast adjust user LCD contrast adjustment Installation Caution The ATS 1 is a solid state electronic device Use proper electronic static protection practices to prevent damage 1
4. ay in its current state until it gets another LED command Sending the Beep command turns the buzzer on for 1 3 of a second after which it will stop If a second Beep command is sent before the first one is completed an internal timer will be reset for an additional 1 3 second of the buzzer running from the time the second command is sent Sending a series of Beep commands will not accumulate the amount of time the buzzer operates For example sending the command 3 times in succession with no delays between them will only play a few milliseconds longer than the normal 1 3 second Pressing a switch sends a serial byte of data to the Arduino The switches are numbered 1 6 and have labels shown below Pressing switch 1 will send an ASCII 1 to the Arduino Pressing switch 2 gt sends an ASCII 2 etc Switches 1 4 are arranged in a cross pattern with arrow legends for UP DOWN LEFT and RIGHT Your software can use them for moving the LCD cursor around selecting options in a menu or whatever you want your program to use them for Switches 5 and 6 are labeled F1 and F2 and can be used for any purpose you define them for Switch Label Character Returned A 1 gt 2 lt 3 V 4 Fl 5 F2 6 Pressing a switch will send a single ASCII character The switch must be released before it or another switch closure will be recognized by the ATS 1 microcontroller The RESET switch does not send commands but rather do
5. es a hard reset on the ATS 1 and the Arduino host board The Serial read function is used to catch switch press characters Example char Key define the variable to hold the byte send back Key Serial read wait until the user presses a switch Key will get the value of the switch pressed 1 6 if Key 1 see if they pressed switch 1 do the stuff for switch 1 press if Key 2 check for switch 2 do the switch 2 thing you may also want to use the switch case program structure for selecting among multiple switch type presses Using Software Serial UARTS The Arduino uses the microcontroller s internal hardware UART peripheral for sending and receiving serial data Using an internal hardware peripheral reduces the software overhead to conduct serial communications The USB connection to the PC also uses this port for uploading software to the Arduino The ATS 1 will interfere with data transfer between the PC and Arduino Removing jumpers G1 and G2 disconnect the ATS 1 from the Arduino when uploading new software onto the Arduino G2 must be removed when uploading new programs into the Arduino when using the DO and D1 serial lines If you wish you can use a software UART which allows you to use different digital I O pins on the Arduino to communicate with the AST 1 Some applications require additional serial ports and developers have written software implementing software UARTS At least two versions are
6. sure the host and ATS 1 grounds are connected together The host system must be a 5V system Connect a wire from the pad labeled TX to the serial out port of the host system Connect a wire from the RX pad to the serial input to the host Be sure the host serial port connections are to 5V signal levels and not RS 232 levels or the ATS 1 will be damaged Set the UART settings on the host for 4800 baud 1 stop bit no parity Checking the ATS 1 Firmware Version You can check the version of the firmware by holding the key down and then turning on the power Press the reset button to return the ATS 1 to normal operation Warranty and Support The ATS 1 is warranted for 90 days from purchase date Unified Microsystems will at its option repair or replace defective units returned during the warranty period Unified Microsystems reserves the right to change specifications of it products at any time without notice Schematics sample programs FAQs additional information can be found at www unifiedmicro com support Support is provided by email only w9xt unifiedmicro com Include ATS 1 in the subject line Www unifiedmicro com APPENDIX 1 ASCII Commands Sent to ATS 1 Terminal Shield Command Hex Decimal Description Example CLR_DISP 0x01 1 Clear display amp home cursor Serial write 1 CUR_BACK_SPACE 0x08 8 Move cursor home and leave displayed Serial write 8 characters LED_ON 0x11 17 T
7. the start of your program void setup Serial begin 4800 opens serial port sets data rate to 4800 bps Sending data to be displayed on the LCD display is very simple You use the standard Serial print functions If you are using a software UART there will be a similar function The first program written by programmers is the Hello world program Printing this only requires the following line of code Serial print Hello world When a character is sent to the ATS 1 to be displayed it will show up at the position indicated by the cursor just like when typing on a PC After a reset the ATS 1 will have the visible cursor turned off You can optionally display a cursor in the form of a blinking box or an underline See Appendix 1 for instructions on controlling the cursor display Serial write is used to issue commands to the LCD Some of the commands allow the program to clear the display position the cursor select the cursor type and turn it on or off etc These are described in Appendix 1 Note that the commands use non printable characters requiring the Serial write n statement Note that the Serial print n B YTE statement which was an alternative way to send non printable characters is not supported starting with the Arduino 1 0 development environment The buzzer and LED are also controlled with Serial write n commands There is a command to turn the LED ON and another to turn it OFF The LED will st
8. urn the LED on Serial write 17 LED_OFF 0x12 18 Turn LED off Serial write 18 CUR_RIGHT 0x15 21 Move cursor right 1 char arrow key Serial write 21 does not change displayed character CUR_LEFT 0x16 22 Move cursor left 1 char arrow key Serial write 22 does not change displayed char CUR_OFF Ox1C 28 Turn cursor off do not display Serial write 28 CUR_BOX_ON 0x1D 29 Display blinking box cursor Serial write 29 CUR_LINE_ON OxlE 30 Display underline cursor on Serial write 30 CUR_CR 0x0D 13 Carriage Return moves cursor to first Serial write 13 position on current line CUR_LF 0x0A 10 Line Feed moves cursor to other line Serial write 10 same horizontal position Bell 0x07 7 Turns buzzer on for 1 3 second Serial write 7 GOTOXY 0x14 20 Moves cursor to selected location See Below The LCD display holds two rows of 16 characters The upper left character home position has X Y coordinates 1 1 The X coordinate or horizontal position ranges from 1 left most character to 16 the right most character The top row has a Y coordinate value of 1 and the bottom row has a coordinate value of 2 The GOTOXY command is the only command with data bytes following the command To move the cursor to a location the GOTOXY byte is first sent followed by the X coordinate 1 16 and finished with the Y coordinate 1 2 If the coordinate data is outside the valid range the entire command is canceled Example to move the c
9. ursor to the 8 position on line 2 Serial write 0x14 command to move the cursor Serial write 8 Specify the X location to position 8 Serial write 2 Specify the line number Y location to the bottom line To save programming time and space create a function void Lcd_pos char X char Y Serial write 0x14 command Serial write X horizontal position Serial write Y Line number To use this function just call it with the position and row as parameters Led_pos 4 1 4 position in row 1 Led_pos 10 2 10 position in row 2
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