Connect multiple OneWire Maxim DS1820/DS18S20/DS18B20 thermometers to Arduino, and program it to measure the temperatures - Quick and Easy!
by Boian Mitov
Measure rotation speed (RPM) with Optocoupler and Encoder disk and Arduino - Quick and Easy!
There are a lot of tutorials, on how to control Servos with joysticks, or analog sensors, but sometimes we need to control them with buttons
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