DHT22 measure fails

[dsaad]

My esp32 is loaded with 'esp32-20220117-v1.18.bin' firmware. I have tried to read the DHT measurement, but every time it failed. I have tried one time GPIO 23 and one time 4 and both of them failed.

Worth mentioning it is not my first time, I have used the same code on other esp32 boards with the exact same DHT22 sensor and worked every time, but now I don't know why I'm failing here.

Code: Select all

import machine
import dht
PIN23 = machine.Pin(23, machine.Pin.IN, machine.Pin.PULL_UP)
sensor = dht.DHT22(PIN23)
sensor.mearure()

Code: Select all

Traceback (most recent call last): File "<stdin>",
line 1, in <module> File "dht.py",
line 23, in measure OSError: [Errno 116] ETIMEDOUT

[OlivierLenoir]

I'm maybe wrong, but, can you check gnd braising on ESP32 board, it does not seem good on the picture.

[Roberthh]

Are pull-up resistors present on the data line? At the DHT22 sample I have it is soldered to the backside of the sensor.

[Shards]

I've tested it with an ESP-32,running v1.18. It works just fine with your code. However, if I disconnect ground, power or data I get exactly the error you are seeing.

This is with no additional pull-up resistor.

Looks like Olivier is right to suspect the solder joint(s).

[dsaad]

I have re-soldered everything and added a 10 K ohm resistor and check the solders and connections with multimeter and tried the code and again same error.

Is it possible, there is a problem with the sensor?