You can also use an Arduino Uno instead of a console cable. We spliced alligator clips with breadboard wires and connected D0 on GEMMA to pin 0 (aka RX) on the Arduino Uno board, D1 on GEMMA to Arduino pin 1 (aka TX), GEMMA GND to Arduino GND, and clip your sensor between GEMMA A1/D2 and GND.

Load a blank sketch onto your Arduino Uno:

void setup() {


void loop() {

Load the code from the previous page onto your GEMMA. Power GEMMA over USB or with a battery, open up the serial montitor and watch your sensor values pour in!

This guide was first published on Aug 20, 2014. It was last updated on Mar 08, 2024.

This page (Use an Arduino Uno instead) was last updated on Nov 13, 2014.

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