27/08/2025 5:38 am
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How can I connect sensors like DHT11, PIR motion sensor, and MPU6050 to an ESP32? Do they work directly with 3.3V, and are there any specific libraries or wiring tips I should know about?
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28/08/2025 4:55 am
Yes, you can connect sensors like the DHT11, PIR motion sensor, and MPU6050 directly to the ESP32, but you need to be mindful of voltage and wiring. Since the ESP32 works at 3.3V logic, the DHT11 is safe to run at 3.3V, and it requires a pull-up resistor (4.7k–10k) on its data pin.
Most PIR modules have onboard regulators, so they can be powered with 3.3V or 5V, and their output is 3.3V compatible, making them safe for direct connection to an ESP32 GPIO.
The MPU6050 typically supports 3–5V, and since it communicates via I²C, you can wire SDA to GPIO 21 and SCL to GPIO 22 on the ESP32 without additional level shifting.
For software support, the Adafruit DHT library works well with the DHT11, the PIR sensor can be read directly as a digital input without a library, and for the MPU6050 you can use either the Adafruit MPU6050 library. With this setup, all three sensors work reliably with the ESP32 at 3.3V.
