光電對射式計數感測器模組 10mm槽寬 光遮斷式電機馬達測速感測器 紅外計數傳感器模組

商品說明

產品特點

一、長尺寸：27.6mm X寬20mm X高17mm
二、主要晶片：LM393、對射式紅外頭
三、工作電壓：直流5伏
四、特點：
1 、具有信號輸出指示。
2 、單路信號輸出。
3 、輸出有效信號為低電平。
4 、靈敏度不可調。
5 、可用於工件計數、電機測速。
6 、電路板輸出開關量！

範例碼

int encoder_pin = 2; // The pin the encoder is connected 
unsigned int rpm; // rpm reading
volatile byte pulses; // number of pulses
unsigned long timeold; 
// The number of pulses per revolution
// depends on your index disc!!
unsigned int pulsesperturn = 20;

 void counter()
 {
 //Update count
 pulses++; 
 }

void setup()
 {
 Serial.begin(9600);
 //Use statusPin to flash along with interrupts
 pinMode(encoder_pin, INPUT);
 
 //Interrupt 0 is digital pin 2, so that is where the IR detector is connected
 //Triggers on FALLING (change from HIGH to LOW)
 attachInterrupt(0, counter, FALLING);
 // Initialize
 pulses = 0;
 rpm = 0;
 timeold = 0;

 }

 void loop()
 {
 if (millis() - timeold >= 1000){ /*Uptade every one second, this will be equal to reading frecuency (Hz).*/
 
 //Don't process interrupts during calculations
 detachInterrupt(0);
 //Note that this would be 60*1000/(millis() - timeold)*pulses if the interrupt
 //happened once per revolution
 rpm = (60 * 1000 / pulsesperturn )/ (millis() - timeold)* pulses;
 timeold = millis();
 pulses = 0;
 
 //Write it out to serial port
 Serial.print("RPM = ");
 Serial.println(rpm,DEC);
 //Restart the interrupt processing
 attachInterrupt(0, counter, FALLING);
 }
 }