04-14-2025, 02:46 AM
I got the same results from 3V and 5V, the real difference was between the 4-pin and 3-pin modules. The one I have is completely enclosed in a plastic case but the circuit diagram is probably this (without the LED):
So it's got an additional pullup (alongside the ones on the board) which is fine since you can use a wide range of values for it, and a decoupling capacitor. Whatever the case, this configuration works a lot better than just the raw DHT22 sensor.
If anyone else has any experience with this it'd be interesting to hear about them, there's so many DHT22 variants that it could be luck rather than the module design that has the 3-pin module perform better.
So it's got an additional pullup (alongside the ones on the board) which is fine since you can use a wide range of values for it, and a decoupling capacitor. Whatever the case, this configuration works a lot better than just the raw DHT22 sensor.
If anyone else has any experience with this it'd be interesting to hear about them, there's so many DHT22 variants that it could be luck rather than the module design that has the 3-pin module perform better.