//第一节
#define freq 50//频率20ms
#define channel 0//通道号
#define reso 8//分辨率8，表示2的8字方
#define servo 13//舵机引脚
int calculatePWM(int degree){
 int min_width=0.5/20*pow(2,reso);
 int max_width=2.5/20*pow(2,reso);

return (max_width-min_width)*degree/180+min_width;


}

void setup() {
  // put your setup code here, to run once:
  //Serial.begin(115200);
  //Serial.println("Hello, ESP32!");
//建立ledc函数
ledcSetup(channel,freq,reso);
//关联gpio口与ledc通道
ledcAttachPin(servo,channel);

}

void loop() {
for(int i=0;i<180;i+=30){
  ledcWrite(channel,calculatePWM(i));
delay(500);
}
}

/*//第二节
#include <Servo.h>
//定义对象
Servo my_servo;
#define servo_pin 13
#define max_width  2500
#define min_width  500
void setup(){
  //分配硬件定时器
  ESP32PWM::allocatetimer(0);
  //设置频率
  my_servo.setPeriodHertz(50);
  //关联servo与gpio引脚，设置脉宽范围
  my_servo.attach(servo_pin,min_width,max_width);
}
void loop(){
  my_servo.write(180);
delay(1000);

 my_servo.write(0);
 delay(1000);
}*/