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HomeElectronicsClassic rotary cellphone turns into fashionable kitchen timer

Classic rotary cellphone turns into fashionable kitchen timer


Classic rotary cellphone turns into fashionable kitchen timer

Arduino WorkforceMight twenty eighth, 2024

It looks as if every part that occurs in a kitchen requires actual timing. Whisk the batter for 3 minutes, knead the dough for quarter-hour, bake for half-hour, and so forth. A timer is a necessity for cooking and baking, however there is no such thing as a purpose you must use your cellphone or a boring egg timer from the greenback retailer. You’ll be able to observe Scott-28’s lead and convert an vintage rotary cellphone into a trendy kitchen timer.

This seems to be like a very previous rotary cellphone, however it’s really a flexible kitchen timer that counts down from as little as one second or as a lot as 99 hours and 99 minutes. Customers enter the time by spinning the rotary dial, which is nice enjoyable. Then, when the countdown ends, the old fashioned ringer bells begin chiming. A four-digit seven-segment show is a bit anachronistic, however makes the timer extra usable by displaying the countdown. Lifting after which dropping the handset turns off the timer. 

This all occurs below the management of an Arduino UNO Rev3 board, which reads the pulses from the rotary dial and the singular enter button. It additionally units the seven-segment show and the LED indicators.

The one tough half was sounding the ringer, which requires AC energy to perform. To offer that from a DC energy provide, Scott-28 used a LS057020 Black Magic Sine Wave Generator. That works like an influence inverter, turning 5VDC into 70VAC (at 20Hz) to drive the ringer. 

The result’s a timer that can impress anybody that walks into the kitchen. 



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