He put the project out on Hackaday.io and also has a video tutorial you can see below. There are five input pins to the chip which lets you connect one analog pin to any one of 32 analog pins.

The isolated analog ... example found in the LM331 datasheet, published by TI. Refer to the LM331 official datasheet for more complex circuits with higher accuracy and/or faster response time. Note ...

What that means, though, is that I can’t give you a link to follow along with examples ... input to the circuit). Conversely, the comparator output and the connection to the Arduino’s analog ...

As for the pins, the UNO features 14 digital pins for both input and output use, six analog pins for input ... small using one of the built-in examples in the Arduino IDE. The most beginner ...

It is a simple digital voltmeter, which can safely measure input dc voltages in 0 to 30V range. The Arduino board can be powered from a standard 9V battery pack, as usual. As you may well know, ...

Electronic engineers, developers and hobbyists looking for a fully featured Arduino Mega compatible ... It is equipped with 32 Inputs (16 x digital 4-30V, 8 x analog 0-10V, 4 x analog 0-5V ...

The Arduino Mega's ... done by simply dividing the input value into four as seen in this basic example code or by using the map() function, as you can see in this Analog In, Out Serial sample ...