Hi, I'm a beginner but have lots of interest in the principles.
I'm doing my project with the DHT22.
I have a question about the principle of the sensor.
DHT22 sends the signal to the MCU in the Digital signal.
There is an Analog to Digital Converter in the sensor.
How does it convert the analog to digital signal?
When I give the 5V power to the part, what's going on after the sensor takes the power?
Please help me to satisfy my curiosity, thank you.
How works DHT22?
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Please be positive and constructive with your questions and comments.
- mikeysklar
- Posts: 13936
- Joined: Mon Aug 01, 2016 8:10 pm
Re: How works DHT22?
Good question about how the DHT22 works. It is using analog component for the sensors a thermistor (temp) and capacitive sensor (humidity), but it also has a digital chip for the conversion to digital and serial output.
https://learn.adafruit.com/dht?view=all
https://learn.adafruit.com/dht?view=all
- rpiloverbd
- Posts: 198
- Joined: Mon Nov 29, 2021 8:13 am
Re: How works DHT22?
Hello,
DHT22 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humiditysensing technology. Following are some resources that will let you know further about this sensor.
1) Datasheet: https://pdf1.alldatasheet.com/datasheet ... DHT22.html
2)Internal structure, communication protocol and working principle: https://www.theengineeringprojects.com/ ... dht22.html
DHT22 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humiditysensing technology. Following are some resources that will let you know further about this sensor.
1) Datasheet: https://pdf1.alldatasheet.com/datasheet ... DHT22.html
2)Internal structure, communication protocol and working principle: https://www.theengineeringprojects.com/ ... dht22.html
Please be positive and constructive with your questions and comments.