I wonder if you can help me, I have this code below using ultrasonic sensor HCSR-04. My problem is I am only getting a printout of zero on the serial monitor.```
int trigPin = A0;
int echoPin= A1;
int pingTravelTime;
int dt = 2;
int dt1 = 10;
int dt2 = 25;
void setup() {
//Serial Port begin
Serial.begin (9600);
//Define inputs and outputs
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
Welcome! You have an interesting project, but first please read the advice in the topic "How to get the best from this forum". There is a proper way to post code, this allows us to help you. Taking what you posted and putting into a readable form takes a lot of time many do not want to spend. It will only take you another 10 seconds after your figure it out. l have no clue as to what each hardware device is or how it interacts with your code, post an annotated schematic, the language of electronics, showing how you have wired it, not pictures such as frizzy (wiring) drawings they are useless for troubleshooting. Do include links to "Technical information" on the hardware parts, links to sales outlets like azon are next to useless. Doing this will have a big positive effect on your answers and will improve the accuracy of the answer a lot.
Check this out:
I would sure like to help you but since you did not take the time to read the forum guidelines I will not burn the time trying to figure out the gibberish you posted. All I can say at this point is good luck!
I agree with gilshultz that you should have read "How to get the best out of this Forum", but since I've already spent some time reading your code, here's my 5 cents:
you don´t need analog pins to use this sensor and pulsein() expects an int as the first parameter. So, you can either still use A0 and A1 physical pins but use their digitalself ID (A0=14 and A1=15) OR choose another pair of digital pins;
pulsein() returns an unsigned long type. So pingTravelTime should obey this type
Test the code version below:
int trigPin = 14;
int echoPin= 15;
unsigned long pingTravelTime;
int dt = 2;
int dt1 = 10;
int dt2 = 25;
void setup() {
//Serial Port begin
Serial.begin (9600);
//Define inputs and outputs
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop() {
digitalWrite(trigPin, LOW);
delayMicroseconds (dt1);
digitalWrite(trigPin, HIGH);
delayMicroseconds(dt1);
digitalWrite(trigPin, LOW);
pingTravelTime = pulseIn(echoPin, HIGH);
delay(dt2);
Serial.println(pingTravelTime);
}
Thanks, because this is my first time. I will take your advice. My project is to integrate this ultrasonic sensor to read the pingTravelTime so I can use this variable to get a target distance. However sensor is printing 0 on the serial monitor. I've different iterations but I'm stucked with this sensor. Thanks
thanks for your reply. I wired this sensor as normal wiring diagram thru arduino nano. The code works but its only printing zero to the serial monitor.
I want to use this variable from the "pingTravelTime" to measure distance. If I'm getting zero variable I can't use this variable to measure distance.
Below is another Arduino code uploaded to my Arduino Uno R4 and its still printing 0 and 0cm on the serial monitor.
I wired the vcc pin of the sensor to 5 volts, trigPin to pin 6, echoPin to pin 5 and ground pin to ground of Arduino.
I hope I done this reply to you ok.
Thanks
Here is another code I tried and it's printing 0 on the serial monitor.
`t#include <HCSR04.h>
int trigPin = 6;
int echoPin = 5;
int pingTravelTime;
int dt = 10;
int dt1 = 100; //for accuracy 100 microseconds delay rate recommended
int dt2 = 200;
void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
}
void loop() {
// establish variables for duration of the ping, and the distance result
// in inches and centimeters:
long duration, inches, cm;
digitalWrite(trigPin, LOW);
delayMicroseconds(dt);
digitalWrite(trigPin, HIGH);
delayMicroseconds(dt);
digitalWrite(trigPin, LOW);
pingTravelTime = pulseIn(echoPin, HIGH);
delayMicroseconds(dt1);
Serial.println(pingTravelTime);
// 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(dt2);
}
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: https://www.parallax.com/package/ping-ultrasonic-distance-sensor-downloads/
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;
}
Thanks for your help. I tried what you suggested and its still printing 0 on the serial monitor.
I want to use this variable "pingTravelTime" to measure distance so I can incorporate this to a robot car.
Thanks
Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Can you post some images of your project?
So we can see your component layout.
Thanks for your reply, I tried your modified code wired the sensor as vcc pin of sensor to 5 volts pin of arduino, trigPin of sensor to A0 of Arduino, echo pin of sensor to A1 of Arduino and ground of sensor to ground of Arduino.
It's printing 0 on the serial monitor. What numbers should be printing on the monitor?
click on the button. When the sim starts, click on the Sonar and change the values.
I think for now you should follow @TomGeorge 's advice and use a library to get the distance without worrying with manually triggering the sensor and doing the math.
button. When the sim starts, click on the Sonar and change the values.
