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Wednesday, May 20, 2015

Arduino thermostat with 2 thresholds on 4 digit 7-segment display

   This thermostat with few components has same schematic with previous thermostat:
 
   Few pics with Arduino Mega board (must just few changes in sketch for works with Uno or Mega):
- desired temperature is ok:
- actual temperature is less than desired temperature:
- actual temperature is much than desired temperature:
   After push the MENU button, low threshold can be set:
and if I push the "-" button value is decrease with 1 degree Celsius at every push and if I push the "+" button value is increase with 1 degree Celsius at every push.
   If I push MENU button, high threshold can be set:
and if I push the "-" button value is decrease with 1 degree Celsius at every push and if I push the "+" button value is increase with 1 degree Celsius at every push. If high threshold is set less low threshold, Arduino automatically change high threshold = low threshold + 1 degree Celsius.
   Sketch for this thermostat is put at https://github.com/tehniq3/!
   For best results, I use internal reference (1.1V) and for Arduino Uno board in sketch must see:
and for Mega board must comment fisrt line and uncomment next line !!!
   Fist time when upload the sketch, must write default value for low and high thesholds:
after that must put comments and upload the sketch again:
   I made a movie with this thermostat, named Arduino thermostat with 2 thresholds

6 comments:

  1. Hello, nice just what i'm looking for, can u add a relais in the code so i can use it as a thermostate?

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  2. sketch is ready as thermostat.. connect relay module at A4 for heather thermostat or at A5 for cooler thermostat... ;)

    ReplyDelete
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