Created
October 6, 2023 10:14
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| const int TRIG_PIN = 4; | |
| const int ECHO_PIN = 5; | |
| const int BUZZER_PIN = 3; | |
| const int DISTANCE_THRESHOLD = 30; | |
| // variables will change: | |
| float duration_us, distance_cm; | |
| void setup() { | |
| Serial.begin (9600); | |
| pinMode(TRIG_PIN, OUTPUT); | |
| pinMode(ECHO_PIN, INPUT); | |
| pinMode(BUZZER_PIN, OUTPUT); | |
| } | |
| void loop() { | |
| // generate 10-microsecond pulse to TRIG pin | |
| digitalWrite(TRIG_PIN, HIGH); | |
| delayMicroseconds(10); | |
| digitalWrite(TRIG_PIN, LOW); | |
| // measure duration of pulse from ECHO pin | |
| duration_us = pulseIn(ECHO_PIN, HIGH); | |
| // calculate the distance | |
| distance_cm = 0.017 * duration_us; | |
| if(distance_cm < DISTANCE_THRESHOLD) | |
| digitalWrite(BUZZER_PIN, HIGH); // turn on Piezo Buzzer | |
| else | |
| digitalWrite(BUZZER_PIN, LOW); // turn off Piezo Buzzer | |
| // print the value to Serial Monitor | |
| Serial.print("distance: "); | |
| Serial.print(distance_cm); | |
| Serial.println(" cm"); | |
| delay(500); | |
| } | |
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