DevHeads IoT Integration Server•6mo ago

How to Fix "Failed to Read Sensor" Error on ESP32 with DHT22 in MicroPython?

Hey guys @Middleware & OS am building a Temperature and Humidity Monitoring System with ESP32 and DHT22 Sensor Using MicroPython, my aim is to create a temperature and humidity monitoring system using an ESP32 microcontroller and a DHT22(Temperature and humidity) sensor, read temperature and humidity data from the DHT22 sensor, display the data on the serial monitor and update the readings every 2 seconds. But i keep getting the error failed to read sensor here's my code

from machine import Pin
import dht
import time

# Initialize DHT22 sensor
sensor = dht.DHT22(Pin(16))

while True:
    try:
        sensor.measure()
        temp = sensor.temperature()
        hum = sensor.humidity()
        print('Temperature: %3.1f C' % temp)
        print('Humidity: %3.1f %%' % hum)
    except OSError as e:
        print('Failed to read sensor.')
    time.sleep(2)

from machine import Pin
import dht
import time

# Initialize DHT22 sensor
sensor = dht.DHT22(Pin(16))

while True:
    try:
        sensor.measure()
        temp = sensor.temperature()
        hum = sensor.humidity()
        print('Temperature: %3.1f C' % temp)
        print('Humidity: %3.1f %%' % hum)
    except OSError as e:
        print('Failed to read sensor.')
    time.sleep(2)

Solution:

Also could you check with a logic analyzer if the Data in pin is always high cuz If signal from DHT22 is always high-voltage-level, it means DHT22 is not working properly, please check the electrical connection status....

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2 Replies

melta101•6mo ago

Could you share the entire log

Solution

melta101•6mo ago

Gaming

Programming

How to Fix "Failed to Read Sensor" Error on ESP32 with DHT22 in MicroPython?