Comment on RPi Pico "disconnects" after a few minutes to days
agressivelyPassive@feddit.de 11 months agoI looked it up here: aqicn.org/air/sensor/spec/asair-dht20.pdf (I guess that’s the same datasheet you used)
There it says:
To avoid signal conflicts, the microprocessor (MCU) must only drive SDA and SCL at low level. An external pull-up resistor (for example: 4.7kΩ) is required to pull the signal to a high level. The pull-up resistor has been included in the I/O circuit of the DHT20 microprocessor.
This sounds to me like it’s already present in the package? I also haven’t seen any tutorial using any resistors (though that may be just an “error” made by all of them to keep it simple).
JoCrichton@lemmy.world 11 months ago
Yeah on that specific board it looks like it’s included . I was just going from experience. I just wired such a sensor to an Arduino the other day and I was having problems without the pull up. I was seeing garbled data packets on the data line.