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This is a poor man's geyser. It also saves electricity. The temperature is controlled by a microcontroller i.e., Digispark Attiny85.

Step 1: Parts Needed

  • Plastic enclosure
  • 12v 500ma step down transformer
  • Relay board
  • Digispark Attiny85
  • Switches
  • Buzzer
  • Led
  • Temperature sensor
  • Mains cord
  • 3pin Mains Socket
  • 4.7k resistor

Step 2: Cutting the Enclosure

Cut and fit the switches and socket as shown in the pictures.

Step 3: Code

I took onewire temperature example and modified so that the heater turns OFF at 46 degrees and 44 degrees centigrade and beeps. Slide switch is used to change the temperature mode. It starts again if temperature drops.

Step 4: Assembly and Wiring

  • Upload the sketch to the digispark.
  • Solder 4.7k resistor between p0 and +5v pin in the digispark board.
  • Now assemble and wire according to the pictures.

Note: Use same wire guage for the relay as heater's wire because it draws more power.

<p>Very nice and quick developed prototype!. I really love digispark for its USB form factor, and i think is the cheapest development plattform. Some clones are as low as USD $1.20 ( <a href="http://s.click.aliexpress.com/e/r3FQzBU" rel="nofollow">http://s.click.aliexpress.com/e/r3FQzBU</a> ). Software setup is tricky (somethimes) but nothing to worry!</p>
Thank you
<p>Thanks for the instructable, I intend to use a lot of what you've done. Incase you haven't already thought about it, you should beware of legionaire's bacteria growing the water at temperatures up to 48 degrees. You'd need to periodically get the water to 60-odd degrees to kill off the bacteria that have already grown.</p>
<p>Thanks for the instructable, I intend to use a lot of what you've done. Incase you haven't already thought about it, you should beware of legionaire's bacteria growing the water at temperatures up to 48 degrees. You'd need to periodically get the water to 60-odd degrees to kill off the bacteria that have already grown.</p>

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