Raspberry pi pico with hc05 Bluetooth module using micropython

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Interfacing HC-05 Bluetooth Module With Raspberry Pi Pico

HC-05 Bluetooth Module With Raspberry Pi Pico using Micropython

Table of Contents

Introduction

In this article, we will show you how to use a Bluetooth module with Raspberry Pi Pico. The Pico is a powerful yet small board that is perfect for projects. The Bluetooth module we will be using is the HC-05, which is a low-cost and easy-to-use module that is perfect for projects like this.

Required Material

Raspberry Pi Pico
HC05 Bluetooth Module
Jumper Wire
Breadboard

What is the HC05 Bluetooth Module?

The HC05 Bluetooth Module is a small, inexpensive module that can be used to add Bluetooth connectivity to a project. It can be used to connect to a wide variety of Bluetooth devices. . It can be used for a variety of applications including data transfer, remote control, and wireless networking.

Spec

Bluetooth protocol: Bluetooth Specification v2.0+EDR
Frequency: 2.4GHz ISM band
Emission power: ≤4dBm, Class 2
Sensitivity: ≤-84dBm at 0.1% BER
Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps
Security: Authentication and encryption
Profiles: Bluetooth serial port
Range: <100m
Supported baud rate: 9600,19200,38400,57600,115200,230400,460800.

HC-05 Default Settings

Default Bluetooth Name: “HC-05”
Default Password: 1234 or 0000
Default Communication: Slave
Default Mode: Data Mode
Data Mode Baud Rate: 9600, 8, N, 1
Command Mode Baud Rate: 38400, 8, N, 1
Default firmware: LINVOR

HC05 Bluetooth Module Pinout

How does the HC05 Bluetooth Module work with the Raspberry Pi Pico?

The HC05 Bluetooth Module is a small, inexpensive module that is used to add Bluetooth functionality to the Raspberry Pi Pico. The HC-05 Bluetooth module communicates with the Raspberry pi Pico over the UART interface and can be configured to use either the hardware UART. The module can be powered from the Pico’s 3.3V power supply, or from an external power source.

What is UART?

UART, or universal asynchronous receiver transmitter, is a type of asynchronous serial communication protocol. UART allows two devices to communicate with each other without the need for a common clock signal.

The UART is a very important factor in any serial communications system, as it is responsible for converting data between serial and parallel forms. Without a UART, data transfer would be very slow and ineffective.

Schematic Diagram – Bluetooth Module With Raspberry Pi Pico

Micropython Code

Copy the following code and paste it into the Thonny Editor. Check Also Getting Started With Raspberry Pi Pico With Thonny IDE

test.py

This is an example code for checking connections.

from machine import Pin,UART

uart = UART(0,9600)

while True:
    if uart.any():
        command = uart.readline()
        print(Commands)

from machine import Pin,UART

uart = UART(0,9600)

while True:

if uart.any():

command = uart.readline()

print(Commands)

main.py

#Diyprojectslab.com

from machine import Pin, UART

uart = UART(0, 9600)
led = Pin(13, Pin.OUT)

while True:
  if uart.any() > 0:
    data = uart.read()
    print(data)
    if "on" in data:
      led.value(1)
      print('LED on \n')
      uart.write('LED on \n')
    elif "off" in data:
      led.value(0)
      print('LED off \n')
      uart.write('LED off \n')

#Diyprojectslab.com

from machine import Pin, UART

uart = UART(0, 9600)

led = Pin(13, Pin.OUT)

while True:

if uart.any() > 0:

data = uart.read()

print(data)

if "on" in data:

led.value(1)

print('LED on \n')

uart.write('LED on \n')

elif "off" in data:

led.value(0)

print('LED off \n')

uart.write('LED off \n')

Install Bluetooth Terminal Application

We suggest using the Android app “Serial Bluetooth Terminal” available in the Play Store. You need to download the Serial Bluetooth Terminal App. When you will open the app you can see the next layout. At the base of the app, you can see that we have some buttons marked“M1”, “M2” and so on. We must set up the “M1” as the “On” button and the “M2” as the “Off” button.

Arduino serial Bluetooth terminal Android app

Conclusion

The HC-05 Bluetooth Module can be easily interfaced with the Raspberry Pi Pico.

Go to your smartphone and open the “Serial Bluetooth Terminal” app. Make sure you’ve allowed your smartphone’s Bluetooth. To connect to the Pico for the first time, you need to pair a new device.

Then, you can write the“On” and “Off” messages to control the LED.