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    Simpler way to use the bluetooth cb module?

    Pythonista
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    • macmacmac
      macmacmac last edited by macmacmac

      The Pythonista code below connects to an HM-10 BLE module connected to an Arduino (TX>RX, RX>TX). It sends the character 'H' to turn on the internal LED of the Arduino.
      It works, but is it possible to simplify the code? I know the name of the module (HM-10-BLE) the UUID of its only service (FFE0) and the UUID of its only characteristic (FFE1). Do I really have to scan and compare, discover and compare and discover and compare each and every time I want to connect? Is there a way to connect directly using name and UUIDs?

      # Sending the character 'H' to an HM-10 BLE module
      # Module Name 'HM-10-BLE’
      # Module Service UUID 'FFE1' 
      # Module Characteristics UUID 'FFE0'
      
      import cb
      
      class MyCentralManagerDelegate (object):
      	def __init__(self):
      		self.peripheral = None
      
      	def did_discover_peripheral(self, p):
      		if p.name == 'HM-10-BLE' and not self.peripheral:
      			print 'Discovered ' + p.name
      			self.peripheral = p
      			cb.connect_peripheral(self.peripheral)
      
      	def did_connect_peripheral(self, p):
      		print 'Connected Peripheral ' + p.name
      		print 'Looking for Service FFE0'
      		p.discover_services()
      
      	def did_discover_services(self, p, error):
      		for s in p.services:
      			if s.uuid == 'FFE0':
      				print 'Found Service ' + s.uuid
      				print 'Looking for Characteristic FFE1'
      				p.discover_characteristics(s)
      			
      	def did_discover_characteristics(self, s, error):		
      		for c in s.characteristics:
      			if c.uuid == 'FFE1':
      				print 'Found Characteristic ' + c.uuid
      				print 'Writing H'
      				self.peripheral.write_characteristic_value(c, 'H', False)
      				
      
      	
      cb.set_central_delegate( MyCentralManagerDelegate() )
      print 'Looking for HM-10-BLE module'
      cb.scan_for_peripherals()
      
      # Keep the connection alive until the 'Stop' button is pressed:
      try:
      	while True: pass
      except KeyboardInterrupt:
      	# Disconnect everything:
      	cb.reset()
      

      .
      .
      Arduino code:

      /*
      Turns thes LED on pin 13 on or off
      Serial.read(); reads one byte in ASCII Format.
      The result is either 65 or ‘A’ in single quotess
      */
      
      #include <SoftwareSerial.h>
      SoftwareSerial softSerial(10, 11); // RX, TX
      
      byte command;
      
      void setup() {
        softSerial.begin(9600);
        pinMode(13, OUTPUT);
      }
      
      void loop() {
      
        command = softSerial.read(); //Read one byte
      
        if (command  == 'L') {
          digitalWrite(13, LOW);
          command=0;
        }
        if (command == 'H')  {
          digitalWrite(13, HIGH);
          command=0;
        }
       
      }
      
      sketchling 1 Reply Last reply Reply Quote 2
      • sketchling
        sketchling @macmacmac last edited by

        @macmacmac : Did you ever find out how to do this? I'd love to do it a simpler way as well. Thanks for sharing, this will help a lot.

        1 Reply Last reply Reply Quote 0
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