Im working on a project for obstacle detecting glasses for visually impared people. When I upload y code too my arduino Uno board, the sensor only reads up to one inch. Can someone look at my code and tell me what i did wrong or what I should change?
This is my code below
/*
Ping))) Sensor
int trigPin = 7; // declarring an interger variale for a digital pin
This sketch reads a PING))) ultrasonic rangefinder and returns the distance
to the closest object in range. To do this, it sends a pulse to the sensor to
initiate a reading, then listens for a pulse to return. The length of the
returning pulse is proportional to the distance of the object from the sensor.
The circuit:
- +V connection of the PING))) attached to +5V
- GND connection of the PING))) attached to ground
- SIG connection of the PING))) attached to digital pin 7
created 3 Nov 2008
by David A. Mellis
modified 30 Aug 2011
by Tom Igoe
This example code is in the public domain.
https://www.arduino.cc/en/Tutorial/BuiltInExamples/Ping
*/
// this constant won't change. It's the pin number of the sensor's output:
const int trigPin = 7;
const int echoPin = 8;
void setup() {
// initialize serial communication:
Serial.begin(9600);
pinMode(trigPin,OUTPUT);
pinMode(echoPin,INPUT);
}
void loop() {
// establish variables for duration of the ping, and the distance result
// in inches and centimeters:
long duration, inches, cm;
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// The same pin is used to read the signal from the PING))): a HIGH pulse
// whose duration is the time (in microseconds) from the sending of the ping
// to the reception of its echo off of an object.
duration = pulseIn(echoPin, HIGH);
// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
}
long microsecondsToInches(long microseconds) {
// According to Parallax's datasheet for the PING))), there are 73.746
// microseconds per inch (i.e. sound travels at 1130 feet per second).
// This gives the distance travelled by the ping, outbound and return,
// so we divide by 2 to get the distance of the obstacle.
// See: PING))) Ultrasonic Distance Sensor - Downloads - Parallax
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds) {
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the object we
// take half of the distance travelled.
return microseconds / 29 / 2;
}