SDA and SCL – Like the UNO, the Arduino Leonardo i2c protocol has the SDA and SCL.VIN – You can use the VIN pin to power other Arduino boards, drivers, and sensors.Įach specialized function/ digital input and output pins operate at 5V and receive a maximum current of 40mA.5V – This pin can power shields and drivers like Bluetooth, sensors, and RFID.
3.3V – The 3.3V is a regulated output pin you can use to power components running at 3.3V or less. Second, you can use an AC-DC adaptor from an external power supply.įurthermore, here’s a look at the various Arduino UNO R3 and Leonardo pinouts. 
First, you can use a Printer Cable to power the Arduino board from your computer. On both boards, the pins are pretty much similar in their operation.Īdditionally, here’s how you can power your Arduino boards. In this section, we’re looking at the various Arduino pins. Pin Descriptions of Arduino UNO and Leonardo
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