Hello, I have been working on this project for quite some time. It uses an Arduino UNO, a humidity sensor, a CO2 sensor and a 4 channel relay, all powered externally by a 12v 800ma source. I finally have got it to work perfectly, but only while the Arduino is connected to my MacBook. while only c…

Environmental control system does not work properly unless connected via USB

profk007 April 22, 2018, 7:54pm 10

Very cool. Thank you gentleman. You just helped save the world.

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