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Using ESP32's Flash Memory for data storage - Electronics-Lab.com
Adafruit's Metro ESP32-S3 Puts Two Cores, 8MB PSRAM, and 16MB Flash in an Arduino UNO Footprint - Hackster.io
Getting Started with ESP32 using Arduino IDE - Blink LED
ESP32 - Wikipedia
ESP32-S2 WROOM Module with PCB Antenna - 4 MB flash and no PSRAM [4MB Flash] : ID 4919 : $3.25 : Adafruit Industries, Unique & fun DIY electronics and kits
ESP32-CAM - Getting Started & Solving Common Problems