PurimIrisBox - Servo and Led

servo_and_led.py

from gpiozero import Servo
from time import sleep
from gpiozero.pins.pigpio import PiGPIOFactory
import sys
import time
import sys
from rpi_ws281x import PixelStrip, Color
import os
import errno
import ast

# LED strip configuration:
LED_COUNT = 1         # Number of LED pixels
LED_PIN = 18          # GPIO pin connected to the pixels (18 uses PWM)
LED_BRIGHTNESS = 255  # Set to 0 for darkest and 255 for brightest

# Create PixelStrip object with appropriate configuration
strip = PixelStrip(LED_COUNT, LED_PIN, brightness=LED_BRIGHTNESS)
strip.begin()

#servo init
factory = PiGPIOFactory()
servo = Servo(12, min_pulse_width=0.5/1000, max_pulse_width=2.5/1000, pin_factory=factory)



def set_led_color(red, green, blue):
    try:
        # Color the pixel
        strip.setPixelColor(0, Color(red, green, blue))
        strip.show()
    except KeyboardInterrupt:
        # Turn off the pixel on Ctrl+C
        strip.setPixelColor(0, Color(0, 0, 0))
        strip.show()

#range is -1 to 1
def set_servo(value):
    servo.value = value


FIFO = 'mypipe'
try:
    os.mkfifo(FIFO)
except OSError as oe:
    if oe.errno != errno.EEXIST:
        raise

#servo.min()
servo.value = 0.9

#Examples of write servo commands
#echo "{'servo':-1}" > mypipe
#echo "{'servo':-1}" > mypipe
#echo "{'servo':-1}" > mypipe

#led
#echo "{'led':(255,0,0)}" > mypipe
#echo "{'led':(255,255,0)}" > mypipe
#echo "{'led':(255,255,255)}" > mypipe

while True:
    fifo_data = ""
    print("Opening FIFO...")
    with open(FIFO) as fifo:
        print("FIFO opened")
        while True:
            buffer = fifo.read()
            if len(buffer) == 0:
               print("Writer closed")
               break
            else:
               fifo_data = fifo_data + buffer
    read_dict = ast.literal_eval(fifo_data)
    if type(read_dict) == dict:
         print(read_dict)
         for key in read_dict:
            if key == 'servo':
                if read_dict['servo'] >= -1 and read_dict['servo'] <= 1: 
                    set_servo(read_dict['servo']) 
            if key == 'led':
                red = read_dict['led'][0]
                green = read_dict['led'][1]
                blue  = read_dict['led'][2]
                set_led_color(red, green, blue)         
    else:
         print ("Not a dict")


while True:
    try:
        # This can be a sleep statement or some other logic
        sleep(1)
    except KeyboardInterrupt:
        break