Freezer to Refrigerator Conversion: Difference between revisions

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{{Hint|The trigger values below did not work. See [[Talk:Freezer to Refrigerator Conversion]]. Try 298 and 301}}
{{Hint|The trigger values below did not work. See [[Talk:Freezer to Refrigerator Conversion]]. Try 298 and 301}}


Code history - [[File:fridge_code.ini]]
Code history - [[File:fridge_code.rtf]]


  <nowiki>
  <nowiki>

Revision as of 01:56, 12 March 2019


HintLightbulb.png Hint: Good job Dorkmo

/Manufacturing Instructions

Introduction

Convert a freezer to a refrigerator, and reduce energy consumption 12x so that your refrigerator uses 8 Watts of average power.

This translates to about 50 million megawatt hours of electricity (126M households with 1 fridge) saved per year in the USA if everyone converted to an energy saving fridge from a 1kWhr/day scenario today. This is about $5 billion dollars saved per year in America.

Nearly every household on Earth has a verticaldoor fridge that uses 100W of power on average - or about 2.4 kWh per day. In a country of a few million households, replacing vertical door refrigerators with chestfridges can save enough energy to allow closing down at least one large power station. Alternatively, construction of a new power station to meet the increasing energy demand could be avoided or delayed. http://mtbest.net/chest_fridge.html

In money terms, the Superfridge costs 2 cents per day to run (assuming 10 vent per kWh electricity cost). This is about $7 per year - compared to $88 for an average fridge.

For the Seed Eco-Home, the cost is actually even better. The off-grid energy system cost $3000 for 3kW not including labor. This translates to 2 cents per kWh energy cost over a 20 year life of the PV system. That is about $1.50 electricity cost to run the refrigerator for a whole year!

Original Work

This work is based on the Mt_Best_Freezer_to_Refrigerator_Conversion.

edit

Wiring Diagram

OSE Fridge Conversion Wiring.png

google doc

Wiring Harness

OSE - Fridge Conversion v0318 - Wiring Harness.png

google doc

BOM

HintLightbulb.png Hint: Transition to Arduino Nano, which is less expensive and appears not to need special libraries to run like the Sparkfun Pro Micro

Bill of Materials' lists all parts required to build a machine.

amazon

sparkfun

Luxury Edition

Tools

  • step drill bit amazon
    • drill
  • butt connector crimper amazon
  • small blade screw driver
  • phillips head screw driver
  • soldering iron - for adding headers amazon
  • electrical tape ace

Arduino Code

HintLightbulb.png Hint: Sparkfun Pro Micro controller appears to require Arduino IDE v1.0.1. Not. See installation notes at https://learn.sparkfun.com/tutorials/pro-micro--fio-v3-hookup-guide/installing-mac--linux


HintLightbulb.png Hint: The trigger values below did not work. See Talk:Freezer to Refrigerator Conversion. Try 298 and 301

Code history - File:Fridge code.rtf 

//A1 read voltage
//D3 sensor power
//D14 relay (-)


  volatile int sensorvalue = 328; //define the variable
  int triggeron = 328;         //number that will trigger fridge on
  int triggeroff = 304;        //number that will trigger fridge off


// the setup function only runs once every time the chip is reset
void setup() {
  digitalWrite(3, HIGH); //for powering thermister  
  digitalWrite(14, HIGH);  //for switching relay
  pinMode(3, OUTPUT);    //begin operating pin
  pinMode(14, OUTPUT);    //begin operating pin
  delay(20000);          // wait for thermister to get a good initial reading
}

// the loop function runs over and over again forever
void loop() {
  sensorvalue = analogRead(A1);   //read sensor
if (sensorvalue > triggeron){     //if sensor reads over triggeron, turn on
  digitalWrite(14, LOW);       //turn on relay
  delay(8000);                 //wait 8 seconds
}
if (triggeroff > sensorvalue){   //if sensor reads below triggeroff, turn off
  digitalWrite(14, HIGH);         //turn off relay
  delay(8000);                  //wait 8 seconds
}
}

Other Options

Further Reading

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