Bastelanleitung: Arduino-basierter Lichtschranken-Trigger

  // Schwellenwert ausrechnen aus durchschnittlichem Messwert und festgelegtem Faktor
  sensor_trigger_threshold[SENSOR_ID] = sensor_trigger_threshold[SENSOR_ID] * sensor_trigger_threshold_percentage[SENSOR_ID] / 100;
  
  int sensorValue = analogRead(sensor_pin[SENSOR_ID]);

  //lcd_print_string(TEXT_SENSORCALIBRATED);
  lcd.setCursor(1,1);
  lcd.print(sensorValue, DEC);
}

  // Schwellenwert ausrechnen aus durchschnittlichem Messwert und festgelegtem Faktor
  sensor_trigger_threshold[SENSOR_ID] = sensor_trigger_threshold[SENSOR_ID] * sensor_trigger_threshold_percentage[SENSOR_ID] / 100;  
lcd_print_string(TEXT_SENSORCALIBRATED);
  
}

#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
 
// define some values used by the panel and buttons
int lcd_key     = 0;
int adc_key_in  = 0;
#define btnRIGHT  0
#define btnUP     1
#define btnDOWN   2
#define btnLEFT   3
#define btnSELECT 4
#define btnNONE   5
 
// read the buttons
int read_LCD_buttons()
{
 adc_key_in = analogRead(0);      // read the value from the sensor 
 // my buttons when read are centered at these valies: 0, 144, 329, 504, 741
 // we add approx 50 to those values and check to see if we are close
 if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result
 if (adc_key_in < 50)   return btnRIGHT;  
 if (adc_key_in < 195)  return btnUP; 
 if (adc_key_in < 380)  return btnDOWN; 
 if (adc_key_in < 555)  return btnLEFT; 
 if (adc_key_in < 790)  return btnSELECT;   
 return btnNONE;  // when all others fail, return this...
}

//KAMERA
#define CAM_TRIGGER_PIN 12
#define FLASH_TRIGGER_PIN 11
#define SENSOR_PIN A1
#define STANDBY 0
#define ACTIVE 1
#define SENSOR_THRESHOLD 400

int mode = STANDBY;
long flashDelayMS = 10;

void setup() 
{
	pinMode(CAM_TRIGGER_PIN, OUTPUT);
	pinMode(FLASH_TRIGGER_PIN, OUTPUT);
        lcd.begin(16, 2);              // start the library
        lcd.setCursor(0,0);
        lcd.print("HighSpeedTrigger"); // print a simple message
        Serial.begin(9600);
}


void loop() {
       lcd_key = read_LCD_buttons();  // read the buttons
       lcd.setCursor(10,1);
       lcd.print(analogRead(SENSOR_PIN), DEC);
       lcd.setCursor(10,1);
       delay(500);
       lcd.print("   ");
       
      {
   if (lcd_key == btnRIGHT)
	
      {
            
		mode = ACTIVE;

	        delay(2000); 
		digitalWrite(CAM_TRIGGER_PIN, HIGH); // open the camera shutter
	}

	if ((mode == ACTIVE) && (analogRead(SENSOR_PIN) < SENSOR_THRESHOLD)) //
	{ //If we're in ACTIVE mode and we sense a pop:
		delay(flashDelayMS);
		digitalWrite(FLASH_TRIGGER_PIN, HIGH); // fire flash
		delay(50);
		digitalWrite(FLASH_TRIGGER_PIN, LOW);
		digitalWrite(CAM_TRIGGER_PIN, LOW); // close camera shutter
                
	        mode = STANDBY;
                lcd.setCursor(0,1);
                lcd.print("fertig");
                delay(3000);
                lcd.setCursor(0,1);
                lcd.print("         ");
                 
      }
 }
 
}