DHT_Simulator

Arduino sketch to simulate a DHT22 temperature and humidity sensor.

Description

The DHT22 is an often used sensor and many libraries are written for it including my own https://github.com/RobTillaart/DHTNew library. To better understand the protocol and to be able to debug my library I wrote a simulator for the DHT sensors in 2014.

The simulator can be used to test applications to that use a DHT sensor, e.g. to get high alarm temp or whatever.

Currently the code uses two analogue ports to get a value for temperature and humidity. Just connect two potentiometers to play and simulate increase and decrease of the temperature and humidity.

2022-11-01

add RP2040 to build-CI
update license

0.2.1

added pin to trigger CRC errors
added temp and hum pin for input for CI
added pins for CRC error, pulse length error and timeout error (to be tested in detail)

0.2.0 version

added flag for random generation of data
added flag for debug
explicit support ESP32 & ESP8266
added counter # samples generated per second ==> so one sees it still runs
added error and debug messages // some commented

The simulator is not tested extensively so please report bugs.

Future

use the simulator-core as a bridge to other sensors. Idea is to use the code of the simulator in combination with a Sensirion or two separate sensors (DS18B20 + ? ) to provide an accurate temperature and humidity. These could then be readable with any DHT library with the performance of a DHT (~ 5ms). (when time permits)
implement a recorder mode, to be able to replay a certain behaviour time after time.

Operation

adjust the pins in the head of the program to meet your setup
compile, connect, run

And have fun.

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