This STEM exhibit/demonstration teaches students about computer algorithms. This exhibit has an analog input control which sets a specific voltage which is shown on the meter which is covered up. The student then performs the algorithm starting with the most significant bit 5V and reads the display which will indicate High or Low. If high, you turn off the switch. If low, you leave the switch on. The numeric display shows the value of the switches that are on. The student then continues to the next bit and repeats until they finish with the least significant bit.

At that point they can read the numeric value of the conversion, and then raise the cover on the meter to see what it was set at.

Volunteer Bob Puckette designed the exhibit and the numeric displays. Volunteer Gary Johnson built the cabinet.

This video shows it running in automatic demonstration mode. The high / low text above the Guess (displaying auto in the above image) are a bit washed out on the video.