[英]LED Won't turn off when output mode is set to LOW
I am making an alarm system using an ultrasonic distance sensor. 我正在使用超声波距离传感器制造警报系统。 It can be armed and disarmed using a remote, and I want a green led to be on when it is disarmed, and a red led to be on when it is armed. 可以使用遥控器进行布防和撤防,我希望在撤防时绿色指示灯亮,在布防时红色指示灯亮。 The red led works fine, but the green one stays on. 红色的LED可以正常工作,但绿色的LED可以保持点亮。
I have tried commenting out the line that turns on the green led, but it seems to be on by default, so when I start the program, it is already on and won't turn off. 我尝试注释掉打开绿色led的行,但是默认情况下它似乎是打开的,因此当我启动程序时,它已经打开并且不会关闭。 The code in question is near the bottom, marked by a comment that says //HERE 有问题的代码在底部附近,并带有注释,表示// HERE
#include "IRremote.h"
#include "SR04.h"
#define TRIG_PIN 12
#define ECHO_PIN 11
SR04 sr04 = SR04(ECHO_PIN,TRIG_PIN);
long distance;
int receiver = 10;
IRrecv irrecv(receiver); // create instance of 'irrecv'
decode_results results; // create instance of 'decode_results'
int buzzer = 3;
int red_led = 2;
int green_led = 0;
bool can_sense = false;
bool release_pressed = false;
bool alarm_off = false;
/*-----( Function )-----*/
void translateIR() // takes action based on IR code received
// describing Remote IR codes
{
switch(results.value)
{
case 0xFFA25D: Serial.println("POWER"); alarm_off = true; break;
case 0xFFE21D: Serial.println("FUNC/STOP"); break;
case 0xFF629D: Serial.println("VOL+"); break;
case 0xFF22DD: Serial.println("FAST BACK"); break;
case 0xFF02FD: Serial.println("PAUSE"); release_pressed = true; break;
case 0xFFC23D: Serial.println("FAST FORWARD"); break;
case 0xFFE01F: Serial.println("DOWN"); break;
case 0xFFA857: Serial.println("VOL-"); break;
case 0xFF906F: Serial.println("UP"); break;
case 0xFF9867: Serial.println("EQ");release_pressed = false; break;
case 0xFFB04F: Serial.println("ST/REPT"); break;
case 0xFF6897: Serial.println("0"); break;
case 0xFF30CF: Serial.println("1"); break;
case 0xFF18E7: Serial.println("2"); break;
case 0xFF7A85: Serial.println("3"); break;
case 0xFF10EF: Serial.println("4"); break;
case 0xFF38C7: Serial.println("5"); break;
case 0xFF5AA5: Serial.println("6"); break;
case 0xFF42BD: Serial.println("7"); break;
case 0xFF4AB5: Serial.println("8"); break;
case 0xFF52AD: Serial.println("9"); break;
case 0xFFFFFFFF: Serial.println(" REPEAT");break;
default:
Serial.println(" other button ");
}// End Case
delay(100);
}
void setup() {
Serial.begin(9600);
pinMode(buzzer,OUTPUT);
pinMode(red_led,OUTPUT);
pinMode(green_led,OUTPUT);
irrecv.enableIRIn();
}
void loop() {
if (irrecv.decode(&results)) // have we received an IR signal?
{
translateIR();
irrecv.resume(); // receive the next value
}
distance = sr04.Distance();
if (distance < 70)
{
can_sense = true;
}
if (can_sense==true and release_pressed==false)
{
while (alarm_off==false)
{
digitalWrite(buzzer,HIGH);
digitalWrite(red_led,HIGH);
delay(500);
digitalWrite(buzzer,LOW);
digitalWrite(red_led,LOW);
delay(250);
if (irrecv.decode(&results)) // have we received an IR signal?
{
translateIR();
irrecv.resume(); // receive the next value
}
}
}
if (release_pressed==false) //HERE
{
digitalWrite(red_led,HIGH);
digitalWrite(green_led,LOW); // This should turn off the green led, but it doesn't
}
if (release_pressed==true)
{
digitalWrite(red_led,LOW);
digitalWrite(green_led,HIGH);
}
alarm_off = false;
can_sense = false;
}
Thanks for any help :) 谢谢你的帮助 :)
Pins 0
and 1
on an Uno are used for serial communication. Uno上的引脚0
和1
用于串行通信。
As soon as you did Serial.begin(9600);
一旦完成Serial.begin(9600);
, you enabled those pins for serial comms, so you can't also use them as standard digital pins. ,您为串行通信启用了这些引脚,因此也不能将它们用作标准数字引脚。
Simply use another pin for your green LED. 只需为绿色LED使用另一个引脚即可。
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