pico-arduino

The Pico does not provide any wireless communication, but we can use a good old HC-05 to Bluetooth-enable the Pico. The HC-05 uses simple serial communication and because we can use any GPIO pin we prefer to use SoftwareSerial.

This module uses 3.3V logic - so this is fitting quite nicely!

Connections

Device Pico
VCC VBUS (5V)
GND GND
TX RX GP15
RX TX GP14

Steps

To test the functionality, the sketch is just copying the input from one Serial device to the other. We assume you use the default settings of the HC-05.

  1. In Bluetooth menu connect your PC to the HC-05 device (using the password 1234)
  2. Open a Terminal to connect to the Bluetooth port (Speed 9600, 8 Data bits, 1 Stop bit, no parity)
  3. Open a Terminal and connect to the Pico
  4. In the Bluetooth Terminal you can see ping messages
  5. If you enter a string in the Bluetooth Terminal it will appear in the Pico Terminal
  6. If you enter a string in the Pico Terminal it will appear in the Bluetooth Terminal

hc-05

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