Hardware

An Atmel LP microcontroller monitors sensor cleaning current.
3 relay switching outputs are controlled with a small assembler programm and the cleaning current is displayed on an 16*2 LCD.  The current is limited to 600mA by hardware (LM317 regulator) and monitored by (low-cost) RC-conversion between 500 and 250mA.

 

A picture of our prototype: The Board can be flashed via AT89ISP pinheader.The design supports 2 wire RS232 connection (RxD/TxD). A small user interface with two buttons allows the user to select different sensor signals and to start or stop the cleaning process.

Any input or questions are  welcome: Mail j.hulzebosch@gms2000.de