The thermometer is assembled on Arduino, uses a temperature sensor DS18B20 and OLED display 128x64. As a voltmeter, the same Arduino board is used. At the input was a voltage divider with two ...

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Voltmeters aren’t terribly expensive, but it’s always more fun to build your own devices. YouTube DIYer Educ8s builds a cheap voltmeter for less than $10 using an Arduino and a voltage sensor.