🌡️ ESP8266 DHT22 Temperature & Humidity Sensor — MicroPython

🧠 Overview

This project shows how to interface a DHT22 (AM2302) sensor with an ESP8266 using MicroPython.
It reads temperature and humidity values every 2 seconds and displays them on the Thonny IDE console.

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⚙️ Hardware Setup

Component	ESP8266 Pin	Description
DHT22 (Data)	GPIO4 (D2)	Sensor data output
VCC	3.3V	Power supply
GND	GND	Common ground

🪛 Connections:

• DHT22 VCC → 3.3V
• DHT22 GND → GND
• DHT22 Data → GPIO4 (D2)
• Add a 10kΩ pull-up resistor between VCC and Data for stable readings.

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🧩 Code

# GPIO04 = D2 = Data of DHT22

import machine
import dht
import utime

dh = dht.DHT22(machine.Pin(4))

while True:
    dh.measure()
    utime.sleep_ms(2000)
    tem = dh.temperature()
    hum = dh.humidity()
    print('Humidity:', hum, 'TEMPERATURE:', tem)