Making an ATtiny85 thermometer with a binary display @MicrochipMakes

FritzenLab electronics shows how to make an Attiny85 thermometer with binary display using six LEDs. It only uses three microcontroller pins for the six LEDs, using charlieplexing. The temperature sensor is the DHT11, communicating with a Digispark ATtiny85 via a single wire.

The DHT11 is read every five seconds, while each LED is updated every 1 millisecond. This is to give the impression that they are all turned on at the same time, while in reality only one is turned on at a time. This is the basic precept of charlieplexing.

See the blog post here.


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