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Tech Note 081 - ESP32 Using the Hardware Serial Ports - YouTube
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152 Additional ESP32 Serial Channels in Arduino IDE (Quickie) - YouTube
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Hardware Connection - ESP32 - — ESP-AT User Guide latest documentation
DOIT ESP32 DevKit V1 Wi-Fi Development Board – Pinout Diagram & Arduino Reference - CIRCUITSTATE Electronics
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ESP32 Pinout: How use GPIO pins ?
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ESP32 Pinout: How use GPIO pins ?
ESP 32 serial1 or serial2 map to different pins than default – ESP32 & ESP8266 – DroneBot Workshop Forums
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