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ESP8266 Node MCU board specifications and pins descriptions. Frequently asked questions related to WI-FI board esp8266 node MCU
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I am getting “espcomm_sync failed” error when trying to upload my ESP. How to resolve this issue? — ESP8266 Arduino Core 3.1.2-21-ga348833 documentation
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esp8266 - What is the use of reserved pins and SDD2, SDD3 pins of the NodeMCU? - Arduino Stack Exchange
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ESP8266 module comparison: ESP-01, ESP-05, ESP-12, ESP-201, Test Board and NodeMCU - Squix - TechBlog
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