Simply connect the red wire to a positive power supply from 4.5 to 28VDC, and brown to the common ground to power the display. Finally, connect the orange wire to whatever you want to measure the voltage of. The display has a microcontroller that will read the voltage, compare it to a stable reference and display the voltage with 0.1V precision on a 3-digit 7-segment display. it can read from 0V to 99.9VDC so it will be good for any electronic project! The meter draws 3-4mA to power the microcontroller and display. This particular LED display is a nice vivid green, which we found very readable. Mounting tabs make this module easy to attach to any box or plate.
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For those outside the US: that coin is about half the size of a silver 10 Dutch Guilders coin, right? Right. 😉
Power supply range 4.5V to 28V, and measurement range 0V to 99.9V? I’d love to see a data sheet about how they did that well, because those are some pretty impressive ranges to maintain .1V precision. Any word on what the accuracy is on that .1V precision?