display_control.py

from subprocess import call

MAX_DISPLAY_IDLE_SECONDS = 60 * 5


class DisplayPower(object):
    def __init__(self):
        self.display_idle_time = 0
        self.display_on = False
        self.on()

    def off(self):
        self.display_on = False
        try:
            call(["vcgencmd", "display_power 0"])
        except FileNotFoundError:
            print("vcgencmd not found")

    def on(self):
        self.display_on = True
        try:
            call(["vcgencmd", "display_power 1"])
        except FileNotFoundError:
            print("vcgencmd not found")

    def update(self, sensor_value):
        if sensor_value == 1:
            self.display_idle_time = 0
            if not self.display_on:
                self.on()
        else:
            if self.display_on:
                self.display_idle_time += 1

        if self.display_on and self.display_idle_time > MAX_DISPLAY_IDLE_SECONDS:
            self.off()