NodeMCU教程 GPIO操作与引脚映射

1、Simple Demo

We can operate the GPIO of NodeMCU like Arduino,Code block-1 is a simple demo gave by the official website.

For more you can see http://nodemcu.readthedocs.io/en/master/en/modules/gpio/

pin = 1--Define the number of GPIO which to operate

gpio.mode(pin,gpio.OUTPUT)--Define the mode of GPIO to output

gpio.write(pin,gpio.HIGH)--Output a high level

gpio.mode(pin,gpio.INPUT)--Define the mode of GPIO to input

print(gpio.read(pin))--Read the input signal,return a number, 0 = low, 1 = high

The syntax of GPIO mode definition is as follows:

gpio.mode(pin,mode[,pullup])

Parameters

pin

pin
to configure, IO index

mode

one
of gpio.OUTPUT, gpio.OPENDRAIN, gpio.INPUT, or gpio.INT (interrupt mode)

pullup

gpio.PULLUP
enables the weak pull-up resistor; default is gpio.FLOAT

2、Pin Map

The Figure-1 (NODEMCU_DEVKIT_V1.0_PINMAP.png) is the GPIO map between NodeMCU and ESP8266.

3、GPIO Index

The Table-1 is the map
between pin index and ESP8266 GPIO. Combined with Figure-1
and Table-1,we can get the pin-index corresponding the hardware GPIO.

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上面是练英语写作的，欢迎吐槽

。中文如下：

1、简单例程

我们可以像Arduino一样只需要几行代码就能方便地操作NodeMCU的GPIO。下面是官方的示例代码，更多请查看

http://nodemcu.readthedocs.io/en/master/en/modules/gpio/

示例代码code block-1

参考http://nodemcu.com/index_cn.html

pin = 1
gpio.mode(pin,gpio.OUTPUT)
gpio.write(pin,gpio.HIGH)
gpio.mode(pin,gpio.INPUT)
print(gpio.read(pin))

pin = 1--定义IO口序号
gpio.mode(pin,gpio.OUTPUT)--输出模式

gpio.write(pin,gpio.HIGH)--输出高电平

gpio.mode(pin,gpio.INPUT)--输入模式

print(gpio.read(pin))--读取输入信号,返回0或1

GPIO模式定义语法如下：

gpio.mode(pin,mode[,pullup])

参数

pin

IO
口序号

mode

可以是gpio.OUTPUT,
gpio.OPENDRAIN, gpio.INPUT, 或者 gpio.INT (中断模式)

pullup

支持gpio.PULLUP上拉模式；默认为
gpio.FLOAT浮空模式

2、引脚映射

NodeMCU与ESP8266端口对应关系Figure-1

3、GPIO序号

GPIO序号与ESP8266引脚对应关系

IO index	ESP8266 pin	IO index	ESP8266 pin
0 [*]	GPIO16	7	GPIO13
1	GPIO5	8	GPIO15
2	GPIO4	9	GPIO3
3	GPIO0	10	GPIO1
4	GPIO2	11	GPIO9
5	GPIO14	12	GPIO10
6	GPIO12

结合Figure-1与Table-1，我们就能得到NodeMCU硬件引脚对应的IO序号。

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