041 – MicroPython TechNotes: Bluetooth HC-06
In this article, I will talk about the (external) BLUETOOTH module with ESP32 using MicroPython.
BILL OF MATERIALS:
To follow this lesson you will need the following:
- ESP32 development board.
- Gorillacell ESP32 shield.
- 4-pin female-female dupont wires.
- Gorillacell Bluetooth module.
PINOUT:
- GND – for the ground pin.
- VCC – for the supply voltage.
- TX – for the UART transmit pin.
- RX – for the UART receive pin.
HARDWARE INSTRUCTION
- Connect the Bluetooth module GND pin to ESP32 GND pin.
- Connect the Bluetooth module VCC pin to ESP32 3.3V pin.
- Connect the Bluetooth module TX pin to ESP32 GPIO 23 pin.
- Connect the Bluetooth module RX pin to ESP32 GPIO 25 pin.
SOFTWARE INSTRUCTION:
- Copy the sample source code below and paste it to your Thonny IDE.
- Run it then modify according to your needs.
- Enjoy and happy learning.
VIDEO DEMONSTRATION:
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– George Bantique | tech.to.tinker@gmail.com
SOURCE CODE:
1. Example # 1, exploring the basics:
# More details can be found in TechToTinker.blogspot.com
# George Bantique | tech.to.tinker@gmail.com
from machine import UART
bt = UART(2, baudrate=9600, tx=25, rx=23)
# The following lines of code can be tested using the REPL:
# 1. To check if there is available serial data
# bt.any()
# 2. To read all data available:
# bt.read()
# 3. Or you can input the number of bytes as parameter
# you want to read from uart
# bt.read(num_here)
# 4. Or you can read 1 line
# bt.readline()
# 5. Now to write / transmit uart data
# bt.write(your_data)
2. Example # 2, controlling an output:
# More details can be found in TechToTinker.blogspot.com
# George Bantique | tech.to.tinker@gmail.com
from machine import Pin
from machine import UART
bt = UART(2, baudrate=9600, tx=25, rx=23)
led = Pin(2, Pin.OUT)
while True:
if bt.any()!=0:
msg = bt.read(bt.any()).decode().strip('rn')
print(msg)
if "ON" in msg:
led.value(1)
if "OFF" in msg:
led.value(0)
3. Example # 3, reading an input:
# More details can be found in TechToTinker.blogspot.com
# George Bantique | tech.to.tinker@gmail.com
from machine import Pin
from machine import UART
from machine import Timer
from time import ticks_ms
bt = UART(2, baudrate=9600, tx=25, rx=23)
led = Pin(2, Pin.OUT)
sw = Pin(0, Pin.IN)
tim0 = Timer(0)
t_start = ticks_ms()
while True:
if bt.any()!=0:
#msg = bt.read(bt.any()).decode().strip('rn')
#print(msg)
msg = bt.read(bt.any()).decode()
if "ON" in msg:
led.value(1)
tim0.deinit()
print('LED is ON')
elif "OFF" in msg:
led.value(0)
tim0.deinit()
print('LED is OFF')
elif "BLINK" in msg:
tim0.init(period=250, mode=Timer.PERIODIC, callback=lambda t: led.value(not led.value()))
print('LED is blinking')
else:
print(msg.strip('rn'))
if ticks_ms()-t_start >= 300:
if sw.value()==0: # BOOT button is pressed
bt.write('Boot button is pressed.rn')
print('Sending "Boot button is pressed."')
t_start=ticks_ms()
REFERENCES AND CREDITS:
1. Purchased your Gorillacell ESP32 development kit at:
WOW your article is amazing.Many interesting information. recently I got interested in the topic UART https://www.micros.com.pl/uklady-scalone/uklady-interfejsowe/uart/ Maybe you will bring up such a topic
Do you mean like this? https://techtotinker.blogspot.com/2020/10/013-esp32-micropython-uart-serial-in.html