Addicore ESP8266 ESP-01 WiFi Wireless Tranceiver Module 1MB (8Mbit) Flash Memory
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NodeMCU ESP8266 Specifications, Overview and Setting Up
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Tech Note 136 - ESP32 Using its 8K of RTC RAM to retain data variables during deep sleep. - YouTube
Electronics Gate
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Amazon.com: DIYmall ESP8266 ESP-01S WiFi Serial Transceiver Module with 4MB Flash : Electronics
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Amazon.com: NodeMCU ESP8266 Development Board with 0.96 Inch OLED Display, CH340 Driver, ESP-12E WiFi Wireless Module, and Micro USB Works Great for Arduino IDE/Micropython Programming (Pin Header Soldered) : Electronics
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