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Sending data between bluno nano and raspberry pi 2 with serial bluetooth module

info 2017-06-22 09:11:34 12320 Views19 Replies
Im trying to send data from an arduino with integrated ble (bluno nano from DFRobot) to a raspberry pi 2 which has an hm10 ble module connected to its serial0 gpio14 and 15 pins.

Im currently using this sketch:
Code: Select all
float flow = 500.06; void setup() { Serial.begin( 9600 );} void loop() { if (Serial.available()>0) { if (Serial.read() == 'R') { Serial.print(flow) Serial.write("\n"); } } }

and Im using this python to read it:
Code: Select all
#! /usr/bin/env python import serial from time import sleep ser = serial.Serial(port='/dev/serial0',parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,bytesize=serial.EIGHTBITS,timeout=1) # Wait to read from Arduino while 1: try: time.sleep(10) ser.write("R") myData = ser.readline() print myData except KeyboardInterrupt: exit()

This should make the raspberry send R to the bluno nano after 10 seconds of running the script. But I get blank lines in the raspberry terminal every ten seconds. I guess that is the print myData line, which is coming in blank. The bluno nano bluetooth led light is on, they are connected. What could be happening?

I have confirmed that anything I type into the arduino ide serial monitor shows up in the raspberry pi. But it appears the bluno is not receiving the data sent by the pi.

bluno.jpg Download(0)

2017-06-27 02:09:55 I guess this is a trick by the AT command. Please check its wiki AT command. There are two line: AT+USBDEBUG = ON/OFF AT+BLUNODEBUG = ON/OFF. Please check what is the status of the BLUNODEBUG? Is it ON? Grey.CC

2017-06-27 00:07:34 How about using a logical level converter, since the working voltages of R pi and Bluno Nano are different robert.chen

2017-06-26 18:43:26 Yes it works with usb but I need to make it work over the serial Bluetooth info

2017-06-25 19:11:04 Have you tried to use USB serial instead of the GPIO pin 14&15 robert.chen

2017-06-25 15:30:08 Thanks, but it didnt work. I tried 20, 100 and 200. info

2017-06-25 12:27:34 Try this code

Code: Select all

 float flow = 500.06;
void setup() {
  Serial.begin( 9600 );}
void loop() {
    if (Serial.available()) {
        if (Serial.read() == 'R') {
             Serial.print(flow)
             Serial.print("\n");
        }
     delay(20);
    }
}

R2D2C3PO

2017-06-25 12:27:34 Try this code

Code: Select all

 float flow = 500.06;
void setup() {
  Serial.begin( 9600 );}
void loop() {
    if (Serial.available()) {
        if (Serial.read() == 'R') {
             Serial.print(flow)
             Serial.print("\n");
        }
     delay(20);
    }
}

R2D2C3PO

2017-06-25 07:16:03 Try to put delay(100) at the arduino side to see if it helps! R2D2C3PO

2017-06-25 04:53:00 Ok I have made them connect via AT commands on serial. Im not using bluetooth protocol, just serial. And I can send from bluno and raspberry receives it. I just CANNOT send from raspberry and receive in bluno. Can you help me figure out why? info

2017-06-24 20:17:54 Um，not sure HM10 is compatible with Bluno Nano. We need to make sure they can be paired at the first place. R2D2C3PO

2017-06-22 09:11:34 Im trying to send data from an arduino with integrated ble (bluno nano from DFRobot) to a raspberry pi 2 which has an hm10 ble module connected to its serial0 gpio14 and 15 pins.

Im currently using this sketch:

Code: Select all

 float flow = 500.06;
void setup() {
  Serial.begin( 9600 );}
void loop() {
    if (Serial.available()>0) {
        if (Serial.read() == 'R') {
             Serial.print(flow)
             Serial.write("\n");
        }
    }
}

and Im using this python to read it:

Code: Select all

 #! /usr/bin/env python
import serial
from time import sleep
ser = serial.Serial(port='/dev/serial0',parity=serial.PARITY_NONE,
        stopbits=serial.STOPBITS_ONE,bytesize=serial.EIGHTBITS,timeout=1)
# Wait to read from Arduino
while 1:
        try:
                time.sleep(10)
                ser.write("R")
                myData = ser.readline()
                print myData
        except KeyboardInterrupt:
                exit()

This should make the raspberry send R to the bluno nano after 10 seconds of running the script. But I get blank lines in the raspberry terminal every ten seconds. I guess that is the print myData line, which is coming in blank. The bluno nano bluetooth led light is on, they are connected. What could be happening?

I have confirmed that anything I type into the arduino ide serial monitor shows up in the raspberry pi. But it appears the bluno is not receiving the data sent by the pi. info

Rich Text Editor

	float flow = 500.06;
	void setup() {
	Serial.begin( 9600 );}
	void loop() {
	if (Serial.available()>0) {
	if (Serial.read() == 'R') {
	Serial.print(flow)
	Serial.write("\n");
	}
	}
	}

	#! /usr/bin/env python
	import serial
	from time import sleep
	ser = serial.Serial(port='/dev/serial0',parity=serial.PARITY_NONE,
	stopbits=serial.STOPBITS_ONE,bytesize=serial.EIGHTBITS,timeout=1)
	# Wait to read from Arduino
	while 1:
	try:
	time.sleep(10)
	ser.write("R")
	myData = ser.readline()
	print myData
	except KeyboardInterrupt:
	exit()