This power supply meter allows you to keep you eye on your load and voltage with a nice digital display without hooking up a bunch of separate meters. How many times have you hooked up a current meter to a project being constructed to see how much juice it’s pulling? Well with this display that second meter can be put to better use! Schematics and code is provided.

“This multimeter was designed to measure output voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An additional function of the multimeter is that it can control (switch on and off) an electric fan used to cool the main heatsink. The power threshold at which the fan switches on can be adjusted using One Touch Button Setup.”