激光束报警器原理图及程序

/* A laser pointer is needed to make a light beam that will be detected by the ldr Make Sure you line up the beam and the ldr properly */ const int sensivity = 400; // 0-1023 a lower value means a more powerful laser #define ldr A0 #define redLed 7 #define blueLed 8 #define buzzer 9 #define buttonPin A2 int buttonState; int state = 0; void setup() { alarmOFF(); Serial.begin(9600); pinMode(redLed, OUTPUT); pinMode(blueLed, OUTPUT); pinMode(buzzer, OUTPUT); } void loop() { int light = analogRead(ldr); int button = analogRead(buttonPin); Serial.print("button = "); Serial.print(button); Serial.print("\n"); Serial.print("light = "); Serial.print(light); Serial.print("\n"); Serial.print("state = "); Serial.print(state); Serial.print("\n"); Serial.print("\n"); if (button >= 1020) { state = 0; } if (light > sensivity) { state = 1; } if ((light <= sensivity) && (state == 0)) { alarmOFF(); } if (state == 1) { alarmON(); } } void alarmON() { tone(buzzer, 1760); digitalWrite(redLed, HIGH); digitalWrite(blueLed, LOW); delay(500); tone(buzzer, 1319); digitalWrite(blueLed, HIGH); digitalWrite(redLed, LOW); delay(500); } void alarmOFF() { noTone(buzzer); digitalWrite(redLed, LOW); digitalWrite(blueLed, LOW); }