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Nodemcu ESP8266 Pinout, Features, and specifications
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  1. Random Nerd Tutorials
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    ESP8266 Pinout Reference: Which GPIO pins should you use?

    • Learn how to properly use the ESP8266 GPIOs and avoid hours of frustration by using the most suitable pins for your projects. See pinout diagrams, functions, notes and tips for different ESP8266 development boa… 展开

    Pins Used During Boot

    The ESP8266 can be prevented from booting if some pins are pulled LOW or HIGH. The following list shows the state of the following pins on BOOT: 1. GPIO16: pin is high at BOOT … 展开

    Random Nerd Tutorials
    Pins High at Boot

    There are certain pins that output a 3.3V signal when the ESP8266 boots. This may be problematic if you have relays or other peripherals connected to those GPIOs. The following GPIOs … 展开

    Random Nerd Tutorials
    Analog Input

    The ESP8266 only supports analog reading in one GPIO. That GPIO is called ADC0 and it is usually marked on the silkscreen asA0. The maximum input voltage of the ADC0 pin is 0 to … 展开

    Random Nerd Tutorials
    On-Board Led

    Most of the ESP8266 development boards have a built-in LED. This LED is usually connected to GPIO2. The LED works with inverted logic. Send a HIGH signal to turn it off, and a LOW s… 展开

    Random Nerd Tutorials
    What pins are used as SPI in the ESP8266?
    The pins used as SPI in the ESP8266 are: ESP8266 allows software PWM in all I/O pins: GPIO0 to GPIO15. PWM signals on ESP8266 have 10-bit resolution. Learn how to use ESP8266 PWM pins: The ESP8266 supports interrupts in any GPIO, except GPIO16.
    randomnerdtutorials.com
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    目录
    Pins Used During Boot
    Pins High at Boot
    Analog Input
    On-Board Led
    What pins are used as SPI in the ESP8266?