Raspberry Pi 3B+ BLE communication to Arduino Nano 33 IOT

Question

I have an Arduino Nano 33 IOT and it uses BLE. I want it to talk to my Pi 3B+ and send all of its sensor data. I cannot figure out a way to do it using Python for the Pi and ArduinoBLE library for my Nano IoT. Is it possible?

• jsotola: this describes the Arduino side ... you will have to figure out the RPi side since it is off topic here .. arduino.cc/en/Reference/ArduinoBLE

Answer 1

For completeness, it appears an appropriate Python library can be installed with:

pip3 install adafruit-circuitpython-ble

The test code, used with the Arduino code 'Echo' from the ArduinoHardwareBLE library is below. This was updated to let you choose the name of the device (here, MY_BLE) rather than any random device that has UART capability. It also allows you to send a small file from a few lines, with a "#" denoting a comment (first character in the line). ESC and a return quits the program.

# Connect to an "eval()" service over BLE UART.
 
from adafruit_ble import BLERadio
from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
from adafruit_ble.services.nordic import UARTService
ble = BLERadio()
 
uart_connection = None
def send_stuff(s):
 uart_service.write(s.encode("utf-8"))
 uart_service.write(b'\n')
 readline=uart_service.readline().decode("utf-8")
 while(len(readline)>0):
 print(readline)
 readline=uart_service.readline().decode("utf-8")
 
while True:
 
 if not uart_connection:
 print("Trying to connect...")
 print("ESC then RETURN to exit.")
 for adv in ble.start_scan(ProvideServicesAdvertisement):
 if UARTService in adv.services:
 regular_name = adv.complete_name
 if(regular_name=='MY_BLE'):
 uart_connection = ble.connect(adv)
 print("Connected")
 # for some reason, we have to read a line...
 uart_service = uart_connection[UARTService]
 print(uart_service.readline().decode("utf-8"))
 break
 ble.stop_scan()
 
 if uart_connection and uart_connection.connected:
 uart_service = uart_connection[UARTService]
 while uart_connection.connected:
 s = input("Prompt: ")
 if(len(s)>0):
 if(ord(s[0])==27):
 print("done.")
 exit()
 else:
 
 # Check if "!" character is used; if so, send contents of a file
 if(s[0]=="!"):
 print("sending commands")
 count=0
 file1=open('commands.txt','r')
 Lines=file1.readlines()
 for line in Lines:
 count=count+1
 tmp=line.strip()
 if(len(tmp)>0):
 if(tmp[0]=='#'):
 print("comment:" + tmp)
 else:
 print("Line{}: {}".format(count, tmp))
 send_stuff(tmp)
 
 else:
 send_stuff(s)

• DragonflyRobotics: Will this work on the Pi 3B+ because I don't know if it has BLE.
• asylumax: If you add a BT adapter, you should be able to.
• asylumax: The specs on the 3B+ say it has BLE, so this might work. I have not tested it however; only with an Ubuntu 20.04 LTS system with (Anaconda) Python 3.7.7.