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Adding External Sensors via GPIO
Tutorials

Adding External Sensors via GPIO

November 4, 2025
9 min read
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GPIO Expansion

24-pin header, 3.3V logic level.

Ultrasonic Sensor

HC-SR04 for obstacle detection.

IR Sensors

Line following, edge detection, proximity.

Environmental

Temperature, light, humidity sensors.

Power

40mA limit, use external power for high-current sensors.