10mm槽寬 LM393 光電對射式計數感測器模組 | 馬達測速 | 紅外線遮斷開關 | 附 Arduino 範例

商品說明

Slotted LM393 Beam Infrared Light Counter Photoelectric Sensor Module

產品參數

• PCB兩圓孔（點到點中心的距離）為 1.5cm，孔徑為0.3cm
• 槽型光耦槽寬10mm
• 主要晶片：LM393、槽型光耦H2010
• 工作電壓：直流5伏

產品特點：

• 具有信號輸出指示。
• 單路信號輸出。
• 有遮擋物時輸出高電平(LED燈滅)，無遮擋物時輸出低電平(LED燈亮)
• 靈敏度不可調。
• 可用於工件計數、電機測速。。。。
• 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);
 }
 }