Raspberry Pi Pico/MicroPython + HC-08 BLE 4.0 UART Module

This exercise run on Raspberry Pi Pico/MicroPython, communicate with HC-08 via UART.

Firstly, it send a sequence of AT command to HC-08 to reset the module to factory setting, and read information about it.

Then stay in a loop to wait any income data from BLE, print on REPL terminal and each to BLE.

It's tested with Android App Serial Bluetooth Terminal.

Connection:
Pico		HC-08
--------------------
3V3		3V3
GND		GND
GP4(Tx)		Rx
GP5(Rx)		Tx

Example code, mpyPico_uart_HC08.py

"""
RPi Pico (MicroPython) exercise:
work with HC-08 Bluetooth UART Module
tested with 'HC-08 V3.1,2017-07-07'
"""
import os
import utime
import machine

#print sys info
print(os.uname())

#indicate program started visually
led_onboard = machine.Pin(25, machine.Pin.OUT)
led_onboard.value(0)     # onboard LED OFF for 0.5 sec
utime.sleep(0.5)
led_onboard.value(1)

#2 sec timeout is arbitrarily chosen
def sendCMD_waitResp(cmd, timeout=2000):
    print("CMD: " + cmd)
    uart.write(cmd)
    waitResp(timeout)
    print()
    
def waitResp(timeout=2000):
    prvMills = utime.ticks_ms()
    resp = b""
    while (utime.ticks_ms()-prvMills)<timeout:
        if uart.any():
            resp = b"".join([resp, uart.read(1)])
    print(resp)

def sendCMD_waitRespLine(cmd, timeout=2000):
    print("CMD: " + cmd)
    uart.write(cmd)
    waitRespLine(timeout)
    print()
    
def waitRespLine(timeout=2000):
    prvMills = utime.ticks_ms()
    while (utime.ticks_ms()-prvMills)<timeout:
        if uart.any():
            print(uart.readline())
            
#print uart info
uart = machine.UART(1, baudrate=9600,
                    bits=8, parity=None, stop=1)
print(uart)

#clear bufer in UART
waitResp()
sendCMD_waitResp("AT")
sendCMD_waitResp("AT+")        #invalid command
sendCMD_waitResp("AT+T")       #invalid command

sendCMD_waitResp("AT+DEFAULT")
#Restore default setting
# The module will reset, restart for 200ms
utime.sleep(0.5)

sendCMD_waitResp("AT")
sendCMD_waitRespLine("AT+RX")  #check basic parameters
sendCMD_waitResp("AT+VERSION") #version and date
sendCMD_waitResp("AT+ROLE=?")  #Master/Slave role
sendCMD_waitResp("AT+ROLE=x")  #invalit setting
sendCMD_waitResp("AT+ROLE=?")
sendCMD_waitResp("AT+NAME=?")  #Name
sendCMD_waitResp("AT+ADDR=?")  #hardware address
sendCMD_waitResp("AT+RFPM=?")  #RF power
sendCMD_waitResp("AT+BAUD=?")  #UART baud
sendCMD_waitResp("AT+CONT=?")  #connect ability
sendCMD_waitResp("AT+LUUID=?") #Search UUID
sendCMD_waitResp("AT+SUUID=?") #Service UUID
sendCMD_waitResp("AT+TUUID=?") #Characteristic UUID

print("running...")
print("----------")
while True:
    line = uart.readline()
    print(line)
    uart.write(line)

print()
print("- bye -")

Next:

~ Raspberry Pi/Python remote control LED on Raspberry Pi Pico/MicroPython with HC-08 + ILI9341 SPI Display via Bluetooth

~ More exercise on Raspberry Pi Pico

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HC-08 Bluetooth UART communication module is a new generation of Bluetooth specification V4.0 BLE Bluetooth protocol based on the transmission module. 

Product page: http://www.hc01.com/products/6
HC-08 English datasheet: http://www.hc01.com/downloads/HC-08A%20version%20english%20datasheet.pdf

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