PyFirmata code for Freetronics Experimenter's Kit

11_piezo.py

import pyfirmata
import math

board = pyfirmata.Arduino("/dev/ttyACM0")

# connect piezo to pin 9 to use PWM
SENSOR_PIN = 0
PIEZO_PIN = board.get_pin('d:9:p')

it = pyfirmata.util.Iterator(board)
it.start()

board.analog[SENSOR_PIN].enable_reporting()

# check buzzer is working
PIEZO_PIN.write(0.2)
board.pass_time(0.5)
PIEZO_PIN.write(0.6)
board.pass_time(0.5)
PIEZO_PIN.write(0.8)
board.pass_time(0.5)
PIEZO_PIN.write(0)

while True:
    light_level = board.analog[SENSOR_PIN].read()
    if (light_level != None):
        # you may wish to adjust the raw reading here to get a better range of beeps
        buzzer_value = light_level
        print "setting piezo to %s" % buzzer_value
        PIEZO_PIN.write(buzzer_value)
        board.pass_time(0.5)
        PIEZO_PIN.write(0)
        board.pass_time(0.5)

1_blink.py

import pyfirmata

LED_PIN = 13

# This is the port on the raspi, you will need to change this for Windows or Mac
# e.g. '\\.\COM3' for Windows or /dev/tty.usbmodemfa131' for Mac 
board = pyfirmata.Arduino("/dev/ttyACM0")

print "Running pyFirmata version:\t%s" % pyfirmata.__version__
print "Firmata version on board:\t%i.%i" % (board.get_firmata_version()[0], board.get_firmata_version()[1])

while True:
    board.digital[LED_PIN].write(0)
    board.pass_time(1)
    board.digital[LED_PIN].write(1)
    board.pass_time(1)

2_eight_leds.py

import pyfirmata

board = pyfirmata.Arduino("/dev/ttyACM0")
ledPins = [6,7,8,9,10,11,12,13]

while True:
    for x in range(0,8):
        print "lighting up led on pin %i" % ledPins[x]
        board.digital[ledPins[x]].write(1)
        board.pass_time(1)
        board.digital[ledPins[x]].write(0)
        board.pass_time(1)

3_digital_input.py

import pyfirmata

board = pyfirmata.Arduino("/dev/ttyACM0")

button = board.get_pin('d:2:i')

it = pyfirmata.util.Iterator(board)
it.start()

button.enable_reporting()

while True:
    if str(button.read()) == 'True':
        print "Pressed!"
    board.pass_time(1)

4_analog_input.py

import pyfirmata

board = pyfirmata.Arduino("/dev/ttyACM0")

SENSOR_PIN = 0
LED_PIN = 13

it = pyfirmata.util.Iterator(board)
it.start()

board.analog[SENSOR_PIN].enable_reporting()

while True:
    light_level = board.analog[SENSOR_PIN].read()
    print "Reading from analog sensor: %s" % light_level
    board.pass_time(1)
    # EXERCISE add blinking of LEDs in response to reading
    # delay = ...
    # board.digital[LED_PIN].write(1)
    # board.pass_time(delay)
    # board.digital[LED_PIN].write(0)
    

5_pwm_led.py

import pyfirmata

DELAY = 0.5
brightness = 0

board = pyfirmata.Arduino("/dev/ttyACM0")

led = board.get_pin('d:11:p')

# increase
for i in range(0, 10):
    brightness = brightness + 0.1
    print "Setting brightness to %s" % brightness
    led.write(brightness)
    board.pass_time(DELAY)

# decrease
for i in range(0, 10):
    print "Setting brightness to %s" % brightness
    led.write(brightness) 
    brightness = brightness - 0.1       
    board.pass_time(DELAY)

board.exit()

6_servo.py

import pyfirmata

DELAY = 1
MIN = 5
MAX = 175
MID = 90

board = pyfirmata.Arduino("/dev/ttyACM0")

servo = board.get_pin('d:11:s')
 
def move_servo(v):
    servo.write(v)
    board.pass_time(DELAY)

move_servo(MIN)
move_servo(MAX)
move_servo(MID)

board.exit()

7_rgb_led.py

import pyfirmata
import random

board = pyfirmata.Arduino("/dev/ttyACM0")
RED_PIN = board.get_pin('d:9:p')
GREEN_PIN = board.get_pin('d:10:p')
BLUE_PIN = board.get_pin('d:11:p')

# light up red, green, blue
RED_PIN.write(1)
board.pass_time(0.5)
RED_PIN.write(0)
GREEN_PIN.write(1)
board.pass_time(0.5)
GREEN_PIN.write(0)
BLUE_PIN.write(1)
board.pass_time(0.5)

# randomly change colour every half second
while True:
    RED_PIN.write(random.random())
    GREEN_PIN.write(random.random())
    BLUE_PIN.write(random.random())
    board.pass_time(0.5)

README.md

This Gist contains code samples showing how to use PyFirmata 0.9.5 with the Freetronics Experimenter's Kit

More info on pyfirmata here: https://github.com/tino/pyFirmata

Info on the kit here: http://www.freetronics.com/products/experimenters-kit-for-arduino

These examples were prepared for PyConAU 2014 Introduction to Electronics in Python Workshop, and can be run from iPython Notebook running off a Raspberry Pi

Thank you very much. I just started. It helped me a lot.