When Python talk to Arduino

Yesterday I show a code where when we send a 't' via serial connection, the LED will blink while the arduino board, send back a series of string via serial, the code below is what I used to run on arduino, to test with the python code.
link

	int incomingByte = 0;
	int ledPin = 13;
	void setup(){
	Serial.begin(9600);
	pinMode(ledPin,OUTPUT);
	}
	void loop(){
	if(Serial.available() > 0){
	incomingByte = Serial.read();
	if(incomingByte == 116){
	Serial.println("Blinky");
	digitalWrite(ledPin,HIGH);
	delay(1000);
	digitalWrite(ledPin,LOW);
	}
	}
	}

view raw gistfile1.c hosted with ❤ by GitHub

In the arduino development environment, there is a serial monitor that do the the testing.

Since it is just a standard serial interface, so one can just do it anyway they want. Here I show how to do it via python. First what we need, is the pyserial library, you can install it using pip or easy_install or grab it from pyserial site

To install, just use to following command. if you need more detail, read the docs, because I use python 2.7 it just works for me,

pip pyserial

or

easy_install pyserial

To use it, with the arduino code from the top of the page just, do the following
link

	import serial
	s = serial.Serial(2)
	s.write('t')
	print(s.readline())

view raw gistfile1.py hosted with ❤ by GitHub

The line s=serial.Serial(2) points to com3 on windows, on linux it should be s=serial.Serial('/dev/ttyUSB0'), or other port that shown by the arduino serial monitor. Pyserial actually have a few options on the Serial object, but I found that for arduino, the default is adequate.

And this is how to use arduino to interface to your computer using python. enjiy