When Arduino debuted, most sensors and other interfacing devices ran on 5 volts. This tutorial shows how to hack your 5 volt Arduino board to run on 3.3 volts. It is a simple procedure involving ...

I checked the USB host shield mini information, and I know it should work with Arduino Pro Mini 3.3V, the problem Arduino Pro Mini 3.3V is very difficult to power it with a UBS power （5v） supply. Now ...

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VCC is the power supply pin of the soil moisture sensor that can be connected to 3.3V or 5V of the supply. But do note that the analog output will vary depending on the provided supply voltage. GND is ...