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Amazon.com: KeeYees ESP8266 ESP-12F Mini WLAN WiFi Development Board 4M Bytes for Arduino for NodeMcu for WeMos (5PCS) : Electronics
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arduino - ESP-12 wifi module's the GPIO pin is HIGH on turning it on but should be LOW - Stack Overflow
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Amazon.com: ideaspark 3pcs ESP8266 NodeMCU CH340 ESP-12E WiFi Wireless Internet Development Board Serial Module with Micro USB Cable Works Great for Arduino IDE : Electronics
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