3.3 V vs 5 V: why it matters (read this before wiring)

[OFFICIAL POST] EEDIY Team (official)

ESP32 chips run at about 3.3 V. For example, the ESP32-C6 datasheet gives a recommended supply of 3.0 to 3.6 V.

What this means for you:

1. Power sensors from the board’s 3.3V pin unless the sensor’s instructions say otherwise.
2. Don’t connect 5 V signals straight to ESP32 pins. The ESP32-C6 datasheet lists a maximum high-level input voltage of VDD + 0.3 V (about 3.6 V at a 3.3 V supply), and an absolute maximum of 3.6 V on its power pins. If a part only works at 5 V, use a level shifter (a small board that converts 5 V signals to 3.3 V).
3. Many older Arduino tutorials use 5 V boards, so check before copying their wiring.

Common mistake: wiring a 5 V module’s output straight into a GPIO “because it worked on an Arduino Uno”.

Sources:

• Espressif, ESP32-C6 Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-c6_datasheet_en.pdf

EEDIY Team (official)