Dual Voltage Display (0-20v)

 Hello Everyone,

More developement on Digital Voltmeter Using PIC16F688.

 In previous voltmeter we used to measure only one voltage value.But the voltmeter is modified to diplay two voltages simutaneously.

In modified voltmeter we have assigned pin12 (RA1) as one input and pin11(RA2) as the other input to PIC16F688. The voltage to be measured is fed to one of the 8 analog channels. The reference voltage for AD conversion is chosen to be the supply voltage Vdd (+5 V).A resistor divider network is used at the input end of pin12 and pin11 to map the range of input voltage to the ADC input voltage range (0-5 V).

 Modified Program:Click here

Output

 The  DVM is tested for various input voltages ranging from 0-22 V and some snapshots of the tested DVM are given below.