Sending Arduino data to Raspberry via Bluetooth in Python

Using Arduino Project Guidance
#1

Dear Arduino Forum!

I’ve tried my best to read enough material on this topic to be able to do it myself but unfortuantely I was unsuccessful.

Currently my Arduino is only connected to a HC-05 bluetooth module on pins 10 and 11. What I’d like to achieve is to be able to send numbers or other data periodically to my raspberry which I would eventually store in a text file.

Ultimately it would be thermometer numbers but in order for me to do it a simple loop’d i++ is enough as an example since only the variable’s calculation would differ the rest would stay the same.

This is the code on the Arduino’s end.

#include <SoftwareSerial.h>
 
SoftwareSerial mySerial(10, 11); 

int i;
 
void setup()
{
  Serial.begin(9600);
  i = 0;
  delay(800);
  mySerial.begin(9600);
}
 
void loop() // run over and over
{
    Serial.println(i);
    i++;
    delay(800);
    mySerial.println(i);
  
}

This is the python code

#! /usr/bin/python
import serial
ser = serial.Serial('/dev/rfcomm0' , 9600)
print(ser.name)

ser_bytes = ser.readline()
print = ser_bytes

I have no prior knowledge to this so apologies if I’m missing something obvious. I have managed to establish the connection between the 2 devices and with a different project I have tested and double checked.

My issue is that while the loop’d numbers are showing nicely on COM3 the result on my Raspberry on the other hand is but a single number with the delay added.

So ultimately my question would be how to achieve this:

and not just a single number like so:

I’ve already tried it with while True: but unfortunately I get an error in that case.
As I’m not experienced with python cannot help but think the print line is missing something but cannot firgure it out.

Sincerely,
Nyanpasu

#2

It looks like your python code is doing exactly what you would expect. You're going to need a loop to read more numbers. What error did you get when you tried one?

#3

wildbill:
It looks like your python code is doing exactly what you would expect. You're going to need a loop to read more numbers. What error did you get when you tried one?

When I added while True: to the beginning I got this:

#4

you need to indent the While structure, e.g.

while True: 
    ser_bytes = ser.readline()
    print = ser_bytes
#5

horace:
you need to indent the While structure, e.g.

while True: 

ser_bytes = ser.readline()
print = ser_bytes

134×512 2.75 KB

I feel incredibly silly but good news is that it is working. Thanks for your patience.

#6

This Simple Python - Arduino demo may help.

...R

#7