A quick way of keeping the temperature inside an enclosure / greenhouse under control. In my case I had two enclosures, and I used:- 1 x Arduino UNO board;- 2x DHT temperature / humidity sensors;- 2x relays;- 2x hairdryers;- (optionally) 2x fans (12V) to better circulate the air inside the enclosure…By: Studvio // Read more: original article.