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Tech Note 136 - ESP32 Using its 8K of RTC RAM to retain data variables during deep sleep. - YouTube
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Use PSRAM
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Upgrade ESP32 board without psRAM with 4MB/8MB SPIRAM
Question about ESP32-DevKitC V4, WROVER vs. WROOM - Electrical Engineering Stack Exchange
ESP32 - How To Use PSRAM • ThingPulse
Upgrade ESP32 board without psRAM with 4MB/8MB SPIRAM
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ESP32 PSRAM Schematic and Notes - PCB Artists
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