The voltmeter (pictured above) was extra, and it was a very power and space inefficient way of measuring voltage on two channels which could have been implemented so much easer with and LCD, but I wanted to use seven segment displays and didn't spend a lot of time on research, so I used 74LS47N which require a 4-bit input, which I had the ATMEGA328P output to four d-flip flops for each 7 segment display. The bulkiness of the design could also have been solved with different IC selection, but through-hole is easier to solder manually so that is what I chose. Since this was an extra circuit just for fun, my partner and I did not document it in our reports, so the code and circuit diagram may be found at the bottom of this page instead.