maxsonar-mb1240-trigger with push button

maxsonar-mb1240-trigger with push button

/* Arduino example code for MaxBotix MB1240 XL-MaxSonar-EZ4 ultrasonic distance sensor with push button. More info: www.makerguides.com */


#define readPin 2
#define triggerPin 3
#define buttonPin 4


long distance = 0;
long duration = 0;


int buttonState = HIGH;
int previous = HIGH;
long time = 0;
long debounce = 200;


void setup() {
pinMode(readPin, INPUT);
pinMode(buttonPin, INPUT_PULLUP);
pinMode(triggerPin, OUTPUT);
digitalWrite(triggerPin, LOW);
Serial.begin(9600);
delay(3000);
Serial.println("Sensor is ready, waiting for button press!");
}


void read_sensor() {
digitalWrite(triggerPin, HIGH);
delayMicroseconds(20);
digitalWrite(triggerPin, LOW);
duration = pulseIn(readPin, HIGH);
distance = duration / 58;
delay(100);
}


void print_data() {
Serial.print("distance = ");
Serial.print(distance);
Serial.println(" cm");
}


void loop() {
buttonState = digitalRead(buttonPin);


if (buttonState == LOW && previous == HIGH && millis() - time > debounce) {
read_sensor();
print_data();
time = millis();
}


previous = buttonState;
}