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GPIO Pins of ESP32 | ESP32 Tutorials | by Harshvardhan Mishra | Medium
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L4: Analog input - Physical Computing
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DOIT ESP32 DevKit V1 Wi-Fi Development Board - Pinout Diagram & Arduino Reference - CIRCUITSTATE Electronics
ESP32 Pin Reference | Wiki.js
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ESP32 Pinout simplified: No more confusion when choosing GPIOs.
