Wire up

After soldering headers to the FONA module, plug it into a breadboard. We'll use an UNO, other Arduinos may be different

  • Vio connects to 5V (or, with a 3V logic Arduino, 3V)
  • GND connects to GND
  • Key connects to GND (always on)
  • RX connects to digital 2
  • TX connects to digital 3 (9 on Leo/Micro, 10 on Mega)
  • RST connects to digital 4

We'll be using software serial to talk to the module. The Mega ('2560 based) can't use Digital 3 for FONA TX, so use digital 10 instead.  The Leonardo and Micro ('32u4 based) can't use digital 3 for FONA TX, so use digital 9 instead.  See this page for other pins you can use for FONA TX (SoftwareSerial Receive) on the Mega, Leonardo, and Micro.

 At this time we don't have support for Hardware Serial to talk to the FONA

This guide was first published on May 29, 2015. It was last updated on Mar 08, 2024.

This page (Wiring to Arduino) was last updated on May 29, 2015.

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