Schematic of the Arduino Timer Circuit. When you Press the RESET Button on the Arduino board, the timer will countdown from 60 seconds, as programmed. Once the timer countdown reaches 0 seconds, the ...

[Hlesliebole] wired a 7-segment display to show the current time delay between photos. This can be set on the fly with a potentiometer, so there’s no need to stop and reprogram the Arduino.

It’s safe to say that few people still use rotary phones on a daily basis. Hell, most of us don’t even use landline telephones anymore. But just because these classic phones are no long… ...