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DHT22 sensor on Raspberry Pi with WiringPi

Home Page: https://qengineering.eu/opencv-c-examples-on-raspberry-pi.html

License: BSD 3-Clause "New" or "Revised" License

C++ 100.00%
dht22 dht11 raspberry-pi raspberry-pi-3 raspberry-pi-4 raspberry-pi-64-os wiringpi temperature-sensor relative-humidity-sensors humidity temperature

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dht22-raspberry-pi's Issues

prog delivers confused/zero values inbetween

When compiling and running your program with g++

$ g++ ./src/main.cpp ./src/DHT22.cpp -I./include -lwiringPi -o dht22

$ ./dht22

the output looks like

Temp : 12.00 °C,  Humidity : 99.90 %                                                            
Temp :  0.00 °C,  Humidity :  0.00 %                                                            
Temp : 12.00 °C,  Humidity : 99.90 %                                                            
Temp : 24.00 °C,  Humidity : 199.80 %                                                           
Temp :  0.00 °C,  Humidity :  0.00 %                                                            
Temp :  0.00 °C,  Humidity :  0.00 %                                                            
Temp :  0.00 °C,  Humidity :  0.00 %                                                            
Temp : 12.00 °C,  Humidity : 99.90 %                                                            
Temp : 12.00 °C,  Humidity : 99.90 %                                                            
Temp : 12.10 °C,  Humidity : 99.90 %                                                            
Temp : 12.10 °C,  Humidity : 99.90 %                                                            
Temp : 24.20 °C,  Humidity : 199.80 %

Note
I've been reformatting the output a bit and changing the loop delay to 5000ms inmain.cpp.

We can see zero values and sporadic doubled temperature values and +100 humidity values.

Why is that?

Loop interval timing

In the documentation, it says that the loop timing must be >2 seconds while the code only waits 1 seconds. I set my pause to 2.5 seconds and it helped somewhat. Still throws quite a few errors (I am testing 7 of them simultaneously).

Thanks a million for this work! It really helped me.

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