Protect PIC's input against "high" voltage using AD

[sougata]

Hi,

A low leakage zener diode can always protect your ADC input from high as well as negative voltages. Find the proposed solution as attachment. I recommend using a MCP1541 as your voltage reference.

Thanks to the low impedance of the battery as a voltage source. Otherwise the circuit would not work on any source. As the source would get loaded and change itself.

Ensure proper acquisition delay. Try to use RC osc (ADC Clock) and execute @ SLEEP after setting go/done bit.

Best of Luck.

P.S. - I never got paid for the project. I accept Paypal.