design the circuit at the Proteus in arduino

absf

Joined Dec 29, 2010
1,942
But your attached zip file is different from what you displayed on post #1.

And you didn't describe what is that "something mistake........"

Allen
 

absf

Joined Dec 29, 2010
1,942
The value of R5/R1 pair is a divider taking 5V and bring it down to (20K/(120K) )*5V=0.83V then feeding your analog input of the Arduino.

All the data processing is done in Arduino and the output is fed to the PCF8574 serial to parallel chip then display on the 4x16 LCD. If you measure the voltage between R5/R1, it will probably be correct. The problem I think is in your Arduino codes.

I did change the value of R5 to 20K and the voltage display on the LCD remains the same. The Proreus 8 that I used is a demo copy and it times out in a few minutes. And I dont know enough in Arduino language in order to help you.

Allen
 
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