void setup () {
Serial.begin(115200);
}

void loop () {

unsigned long begt = 0, begt2 = 0, runt = 0;
int v1 = 0;

begt = micros();//记录开始微秒数

for (unsigned long i = 0; i < 1000000; i++)
{
v1 = analogRead(32);
}

begt2 = micros();//记录结束微秒数
runt = begt2 - begt; //计算用时

Serial.println(String ...