Distance Meter 2 User Manual
Contents
1. AN R3 100K D1 RI 100K MB1100 4 N4448 1N4148 C2 10nF 1N4148 r cs RIAK RTK VCC VCC BRD FERRITE 10uF 10uF ow lt L c dL VCC BRD VCC BRD Figure 2 DistanceMeter 2 additional board connection schematic 79 12mm oo zu ma UL EH ERE RR G3 eng e 5 E Ce Os mimimi Rl eo DistanceMeter 2 BY MIKROELEKTRONIKA Figure 3 Dimensions of the DistanceMeter 2 additional board MikroElektronika poddns uepios SO JU mmm ES B WOOD SOJILUMPOUJO je sn JOe UOD o ejejiseu jou op sjesodosd sseulsnq Jo SIUSLULUOD suonsenb Aue aaey no Jl ye 1exon INOA eoejd se jd uoneuuojui jeuonippe pasu un JO sjonpoid ino Jo Aue YUM E eulos penses aJe noA jj WoT 90 IUL MMM Je IN Ino SIA sp ld slonpoud ind Jode aoi T e noA Jj QTYOM Q34aqGq38W3 YO4 SNOIL TIOS 3HVMQHVH ANY 3HVM13OS2. DistanceMeter 2 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 si ple DistanceMeter 2 The DistanceMeter 2 additional board is used to measure distance by using ultrasonic waves Key features Sound Pressure Level SPL 117dB OdB 0 2n bar Sensitivity SEN 60dB OdB 1V u bar Operating Frequency 38KHz to 42KHz 3 3V or 5V power supply voltage 900m Figure 1 DistanceMeter 2 additional board How to connect the board The DistanceMeter 2 is connected to a development system via IDC10 connectors CN1 and CN2 Depending on the development system in use it is necessary to set the appropriate switch on DIP switch SW1 to the ON position How to use the board The operation of the DistanceMeter 2 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 reflected
3. 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 DIP switch SW1 is used to select which two microcontroller pins will be used for this see Figure 2 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 DIP switch SW1 is used to select which microcontroller analog pin will be used for this see Figure 2 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 example on how to measure distance using DistanceMeter 2 can be found on our website at www mikroe com MikroElektronika MB1100
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