GY-63_MS5611/sketches/DHT_Simulator

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

1. 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)

2. 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.