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); } }