PyFirmata summary

For using a firmata (Respberry <-> Arduino) you must install it on:

• Arduino (Firmata - Arduino)
• Raspberry Pi (Firmata - Raspberry Pi)

Statement of connection types:

device/connection type	get_pin(...) string	available values
relay shield	d:pin_no:o	0 and 1
DC motor	d:pin_no:p	0.0 - 1.0
servo	d:pin_no:s	0 - 255
analog input (*)	a:pin_no:i	0.0 - 1.0

(*) you must start reading analog input:

from pyfirmata.util import Iterator
...
board = ArduinoMega('/dev/ttyUSB0')
iterator = Iterator(board)
iterator.start()
...

Example use servo:

from pyfirmata import ArduinoMega
board = ArduinoMega('/dev/ttyUSB0') # Arduino usb port
servo = board.get_pin('d:2:s')      # pin PWM no 2
servo.write(50)                     # set servo position 0-255