@[esp8266接口状态设置和读写]

esp8266的IO口

esp8266有GPIO0-GPIO15

GPIO0-15有内置上拉电阻

GPIO16内置下拉电阻

上拉电阻与下拉电阻

esp8266的IO口在没有接上拉或下拉电阻的时候，会处在悬空状态可能是高电平/低电平不确定。esp8266内置了上拉与下拉电阻。

设置上拉模式并读取接口电平

int key1 = D6;
int key1State = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(key1,INPUT_PULLUP);  //输入模式并启用上拉电阻
  pinMode(GPIO1,OUTPUT);
  Serial.begin(115200);//串口速率
}

void loop() {
  // put your main code here, to run repeatedly:
  key1State = digitalRead(key1);
  Serial.println(key1State);//串口发送
  digitalWrite(GPIO1,1);//设IO口为高电平
  delay(300);
  }