Bench supply precision voltage and amperage measurement

Here is the complete software project for the precision measurement of voltage and current measurement of a bench power supply.

This software files are only for the measurement system of voltage and amperage that is fitted to the bench supply I already got (single channel 30V and 5A and about 50W).

This measurement system uses an old micro-controller (I already had a board with it): Microchip PIC 16F876A with 16MHz external crystal, a ADS1112 16 bit ADC which works in differential mode both for voltage and current measurement and a HD44780 compatible LCD screen.

I don't have a schematic for this project, everything is soldered on a breadboard but can be easily figured out from the board.h file.

For the current measurement I used a 0.5 ohm resistor and measure differentially the voltage across it's terminals for current conversion. I didn't use a voltage divider for the current reading but I used one for voltage measurement because the voltage here can be much higher.

More info about the ADC and driver here.

I'm very happy with this bench supply and I am using it reliably for many years now

Recently I finished the bench supply housing, here are some pictures: