Temperature-Humidity Meter

Posted on: Wed, 23/05/2018 - 13:19 By: Peter


This project describes a simple device to measure temperature and relative humidity and displays their values, along with the apparent temperature, often describe as “feels like”.


The Circuit

The sensor used is the ubiquitous DHT21, a digital sensor which in this case is read via a small MCU chip, an ATtiny84, and the output displayed on a 16 character by 2 line LCD display.

The circuit schematic is shown below, and dxf files are available for download at the bottom of the page.

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