Esp Wroom 32 Schematic
The first release of esp-wroom-32 module datasheet Esp32 pinout reference: which gpio pins should you use? Wroom datasheet
Tiny $7 IoT module packs WiFi, BLE, and sensors, runs FreeRTOS
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Tiny $7 IoT module packs WiFi, BLE, and sensors, runs FreeRTOS

ESP32 Pinout Reference: Which GPIO pins should you use? | Random Nerd

The First Release of ESP-WROOM-32 Module Datasheet - Electronics-Lab.com