Read power from a power meter and control a analog gauge and a RGB-led.

washerMeter.py

#!/usr/bin/env python
import urllib
import json
from time import sleep
import os

# Used to control Gpios
import pigpio
pi = pigpio.pi()
pi.set_mode(13, pigpio.OUTPUT)  # GPIO as output Green led
pi.set_mode(19, pigpio.OUTPUT)  # GPIO as output Blue led
pi.set_mode(26, pigpio.OUTPUT)  # GPIO as output Red led
pi.write(13, 0)
pi.write(19, 0)
pi.write(26, 0)

# On Broadcom Gpio12 (physical pin 32) we have a analog gauge
dial = 12

# Test
#pi.write(13, 1)
#pi.hardware_PWM(dial, 2000, 250000) 
#sleep(1)
#pi.write(13, 0)
#pi.hardware_PWM(dial, 2000, 0) 


# Create temp file if it doesnt exist
if os.path.exists("/tmp/washerRunning"):
    target = file("/tmp/washerRunning", "r+")
else:
    target = file("/tmp/washerRunning", "w")
target.close

# Get data from server
url = "http://192.168.1.117/"
f = urllib.urlopen(url)
data = f.read()
parsed_json = json.loads(data)
curP = int((parsed_json['power']))
if curP > 100:
    # Washer draws power, it's on
    print "Running"
    # Check if the washer already are marked as running
    target = open("/tmp/washerRunning", 'r')
    washerRuns = target.read
    if washerRuns != "True":
        # No it aint
        # Light led
        pi.write(19, 1)
        pi.hardware_PWM(dial, 2000, 900000) 

        # Set it as running      
        print "Opening the file..."
        target = open("/tmp/washerRunning", 'w')
        target.write("True")
        target.close
else:
    # Power is low...
    print "P is low"
    target = open("/tmp/washerRunning", 'r')
    washerRuns = target.read()
    print "WR: " + washerRuns
    if washerRuns == "True":
        # But washer has status of running
        # Check power again after 180s
        print "Washer is running but power is low"
        sleep(180)

        f = urllib.urlopen(url)
        data = f.read()
        parsed_json = json.loads(data)
        curP = int((parsed_json['power']))
        if curP < 100:
            # Power is still low, the machine is done
            print "P is still low"
            target = open("/tmp/washerRunning", 'w')
            target.write("False")
            target.close
            pi.write(19, 0)
            pi.hardware_PWM(dial, 2000, 0) 

print "Washer is idle"