Light meter made from only a 7-segment display

This is a demo showing a simple light meter using a 7-segment display as both a photovoltaic sensor and the output device for its readings. An LED in the display (the dot) serves as the sensor. It's controlled by an Adafruit ItsyBitsy M4 running CircuitPython.

Code:
https://gist.github.com/tomkinsc/eeed...