arduino的代码帮助初学者

Question

这是我的代码和我，我试图在计时器上运行.......，当我的数字写入4出现时，它会在大于2.5v且我的程序继续运行时关闭。 ...但是，我试图把它放入定时器，如果它没有，在5分钟内达到2.5V的阈值，它将关闭我的数字写入4关闭和另一个数字写入6关闭

if (analogValue < threshold2){  //less 2volts
    digitalWrite(4,HIGH) ;             //compressor on
} 
if (analogValue > threshold3){          //greater than 2.5 volts
    digitalWrite(4,LOW) ;                   // compressor off
}

Answer 1

创建一个unsigned long，它将存储一个定时值“startMillis”并使用这段代码。

//drops below threshold
if (analogValue < threshold2){ 
    //turn compressor on and start timing value
    digitalWrite(4,HIGH) ;
    startMillis = millis();

    //the block below will break if either the
    //voltage goes over the threshold or if
    //the timer variable is greater than
    //300,000ms (5min)
    //additionally, if the timer is tripped it will
    //stop channel 6 before breaking
    while ( analogValue < threshold3 ) {
        if ( millis() - startMillis > 300000 ) {
            digitalWrite(6,LOW) ;
            break;
        }
    }

    //after either condition breaks but before
    //exiting the if() code
    digitalWrite(4,LOW) ;
}