Wednesday, October 14, 2020

AC Notification with DHT22 and ESP8266

The building installed new AC units in the building. On the new units you can actually crank up the fan and turn the unit off completely. Last summer the building would routinely heat up to over 80 degrees. We are on the west side of the building so in the afternoon it gets stuffy.

So we can control fan speed and power, but we cannot control the temperature. I wanted a solution where I could quickly determine if the AC was blowing hot or cold air. First attempt is documented here. I took a DHT22 and hooked it up to an ESP82666.

The ESP8266 takes a temperature reading every few seconds and displays the temp and humidity on a little TM1637 Display.

Here is the code

Here is a pic


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