This short uses a CD4026, a 7 segment display, 9V battery, some resistors, an IR LED and a CdS photocell or phototransistor. Break the IR beam and the display advances to the next digit.
https://www.facebook.com/reel/525596709839365?mibextid=9drbnH
Electronics & Stuff, a lot about LEDs
This short uses a CD4026, a 7 segment display, 9V battery, some resistors, an IR LED and a CdS photocell or phototransistor. Break the IR beam and the display advances to the next digit.
https://www.facebook.com/reel/525596709839365?mibextid=9drbnH