Temperature switch

README.md

• GPIO pins https://www.raspberrypi.org/documentation/usage/gpio/
• 1-wire wiring https://learn.adafruit.com/downloads/pdf/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing.pdf

Similar pojects

• http://hackaday.com/2010/01/31/120v-switching/
• http://www.reefcentral.com/forums/showthread.php?t=2124770

TODO

• Fix && logic

Parts list

• Box
• Power supply
• Fan
• Latching relay $4.29
• Pi $29.95
• Wifi $12.84

check.sh

#!/bin/bash

IN=`/home/pi/opk-1-wire-cli/pull -p 0000052fc128 -s f`
OUT=`/home/pi/opk-1-wire-cli/pull -p 041471d2a2ff -s f`

echo "IN = "$IN
echo "OUT = "$OUT

if [ $IN -gt $OUT ] && [ $IN -gt 40 ]; then
    sudo ./led.py -p 17 -s on
    echo "ON"
else
    sudo ./led.py -p 17 -s off
    echo "OFF"
fi

led.py

#!/usr/bin/python

import argparse
import RPi.GPIO as GPIO

parser = argparse.ArgumentParser()
parser.add_argument("-p","--path", required=True, help="Specify which GPIO pin yy
our LED is connected to",type=int)
parser.add_argument("-s","--state", required=True, help="on/off. Turn LED on or
off.")
args = parser.parse_args()

GREEN_LED = args.path
GPIO.setmode(GPIO.BCM)
GPIO.setup(GREEN_LED, GPIO.OUT)

if args.state == "on" or args.state == 1:
    GPIO.output(GREEN_LED, True)
elif args.state == "off" or args.state == 0:
    GPIO.output(GREEN_LED, False)
else:
    print ("Something went wrong")

Testing wires

Ground = green
Hot = red
Switch = yellow

Output of check.sh

IN = 71.0
OUT = 54.0
./check.sh: line 9: [: 71.0: integer expression expected
OFF