Chest Freezer To Refrigerator Conversion
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BOM
- Arduino Gemma $9.95
- or adafruit Trinket $6.95
- or sparkfun Pro Micro $19.95
- 24-280VAC Relay $9.95
- Thermister $0.75
- 10k Resistor $0.95
- USB 5V Charger $3.95
- USB Micro Cable $1.95
- Junction Box $7.23
Arduino Code
/*
Blink
Turns on an LED on for one second, then off for one second, repeatedly.
Most Arduinos have an on-board LED you can control. On the Uno and
Leonardo, it is attached to digital pin 13. If you're unsure what
pin the on-board LED is connected to on your Arduino model, check
the documentation at http://www.arduino.cc
This example code is in the public domain.
modified 8 May 2014
by Scott Fitzgerald
*/
//A1 read voltage
//D3 sensor power
//D5 relay low
//D7 relay high
volatile int sensorvalue = 330;
int triggeron = 330;
int triggeroff = 300;
void setup() {
digitalWrite(3, HIGH); // turn the LED on (HIGH is the voltage level)
digitalWrite(7, LOW); // initialize in OFF setting
digitalWrite(5, LOW); // set pin 5 low
pinMode(3, OUTPUT);
pinMode(7, OUTPUT);
delay(20000);
}
// the loop function runs over and over again forever
void loop() {
sensorvalue = analogRead(A1); // turn the LED on (HIGH is the voltage level)
if (sensorvalue > triggeron){
digitalWrite(7, HIGH);
delay(8000);
}
if (triggeroff > sensorvalue){
digitalWrite(7, LOW);
delay(8000);
}
}
Other Options
- http://mikeysklar.blogspot.com/p/yatc.html
- https://www.amazon.com/gp/product/B0002EAL58
- https://johnlvs2run.wordpress.com/2009/10/08/chest-fridge-conversion/