May 2019
Intermediate to advanced
542 pages
13h 37m
English
Content preview from Mastering GUI Programming with Python
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Connecting the sensor circuit
The DHT 11 and DHT 22 sensors are both temperature and humidity sensors that can easily work with the Raspberry Pi. Both are packaged as four-pin components, but only three of the pins are actually used. Some component kits even mount the DHT 11/22 on a small PCB with only the active three pins for output.
In either case, if you're looking at the DHT's front (that is, the grill side), then the pins from left to right are as follows:
- The input voltage—either 5 or 3 volts
- The sensor output
- The dead pin (on a 4-pin configuration)
- Ground
Either the DHT 11 or the DHT 22 will work equally well for this project. The 11 is smaller and cheaper, but slower and less accurate than the 22. Otherwise, they are functionally ...
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