PinNinja

you won't need a multimeter ever again

Identify all UART pins by flashing a simple script.

Quickstart

• Flash the script to an Uno.
• Connect the UART Pins to A0,A1,A2,A3 in any order.
• Switch on the device.
• Connect the Arduino to your PC.
• Open up the Serial Monitor.
• See the magic happen.

This has been tested on a couple of routers and on an ESP8266 with 100% success rate.