ULTRASONIC MKIII

It's here the Ultrasonic MkIII board, based on the Ultrasonic MkII board the MkIII has the LM393 dual comparator IC replaced with the onboard PIC16F628's comparators.

 

Click on image for larger view.

 

 ZiBOT's Ultrasonic MkIII Board.

Features:

  • PIC16F628 controller with ICSP header
  • Dual ultrasonic transmitters / receivers
  • On board 5V regulator
  • Voltage doubler to provide +17V
  • Trimmer for trigger level
  • Max range approx 2 metres
The Ultrasonic MkIII board works in a similar way to the MkII board except that the LM393 comparators have been replaced with the onboard PIC16F628 comparators.  This simplifies the circuit and reduces the PCB footprint.

The circuit has one adjustment, the trigger level for the comparators.  This is the level at which the echo (return signal) has to be before it triggers the output.  This has the effect of reducing/increasing the sensitivity of the circuit. Turn clockwise to increase the sensitivity.

The board has an ICSP for in circuit programming, you can program it from scratch if you wish or use the download area to download files and programs.

 
The Ultrasonic Board MkIII Component Layout

Board size 60mm x 57mm

 

 Prototype PCB Top
Prototype PCB Bottom
 

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