Distance Meter 2 PROTO User Manual
Contents
1. DistanceMeter2 PROTO manual All Mikroelektronika s development systems feature a large number of peripheral modules expanding microcontroller s range of application and making the process of program testing easier In addition to these modules it is also possible to use numerous additional modules linked to the development system through the I O port connectors Some of these additional modules can operate as stand alone devices without being connected to the microcontroller 7 MikroElektronika SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD waking ib siw ple DistanceMeter 2 PROTO The DistanceMeter 2 PROTO additional board is used to measure distance between the board and an obstacle by means of ultrasonic signals Key features Sound pressure level SPL 117dB OdB 0 2n bar Sensitivity SEN 60dB OdB 1V u bar Operating frequency 38KHz to 42KHz Power supply 3 3 or 5V Figure 1 DistanceMeter 2 PROTO additional board Figure 2 Back side of the additional board How to connect the board The DistanceMeter 2 PROTO board is connected to a microcontroller or some other device via a 1x5 connector CN1 How to use the board The operation of the DistanceMeter 2 PROTO board is based on sending and receiving ultrasonic waves Ultrasonic waves are sent by using transducer UT1 and received by using transducer UT2 Time between sending an ultrasonic wave and receiving ref2. I O pins of the microcontroller the first pin PWMB_ connection with PWM pins or I O pins of the microcontroller the second pin MB1100 MB1100 1N4148 D2 1N4148 1N4148 C2 10nF c5 R9 4k7 R4 100K 680pF AN a PWMA PWMB i OVCC BRD CN1 VCC VCC BRD 10uF 10uF Figure 3 DistanceMeter 2 PROTO additional board connection schematic 33 25mm 3 20mm PHM PHHB pe io za 2 sS D 2 Oo ot ton imi MCP6284 TU E D 8 El 8 8 llitoElekurpinha 26 82mm WLWZ9 6E Figure 4 Dimensions of the additional board MikroElektronika poddns uepios aouu mmm amp B WOOD SOJILUMPOUJO ze SN JOe UOD o e is u JOU op sjesodosd ss ulsnq 10 SIUSLULUOD suoijsenb Aue aaey no Jl ye 49491 INOA 9ejd se jd uoewoyzu jeuonppe pasu un o sjonpoid ino Jo Aue YUM suis qoid aulos SRE aJe noA jj WoT 3oy IU MMM ye IN Ino SIA sp ld slonpoud ind Jode aoi wea eter noA Jj QTYOM Q34aqGq38W3 YO4 SNOILNTOS JYVMCYVH ANY JYVMLAIOS
3. lected one determines the distance of an object UT1 transmits ultrasonic waves when appropriate signals are brought to PWMA and PWMB lines The frequency of these signals should range between 38 and 42KHz and they may be generated via PWM module s pins or I O pins of a microcontroller When an ultrasonic wave is sent time measurement should start UT2 receives transmitted ultrasonic waves after they are reflected by an obstacle wall for example Received wave is converted by UT2 into an electrical signal which is then amplified and sent to an analog pin of A D converter built into the microcontroller When microcontroller receives a signal via this pin time measurement is done and if voltage is higher than some predefined voltage threshold measurement is valid signal is not caused by some noise Measured time can now be used to calculate the distance When doing calculation it should be taken into consideration that the wave passes two distances to the obstacle and back so the time needs to be divided by two and then multiplied by the speed of sound Concrete examples on how to measure distance using DistanceMeter 2 PROTO can be found on our website at http Awww mikroe com eng products view 439 distance meter 2 proto board MikroElektronika Designations associated to the 1x5 connector CN1 indicate that it is used for AN connection with the pins of A D converter built into the microcontroller PWMA connection with PWM pins or
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