new to arduino programming, making a proximity sensor with an HC-SRO4 module. It works almost flawlessly when connected to my computer via USB, but whenever I connect it to the wall, it stops working. What I've noticed is that the "TX" light also isn't on when it's connected to the wall, but it is when connected to the PC. The adapter i'm using when it's plugged into the wall is 9V/1A DC that came with the arduino.
void setup() {
#define LED 8
#define trigPin 12
#define echoPin 13
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(LED, OUTPUT);
}
void loop() {
int duration, distance;
digitalWrite(trigPin, HIGH);
delayMicroseconds(1000);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1
;if (distance >= 60 || distance <= 0){
Serial.println("no object detected");
digitalWrite(LED, LOW);}
else {
Serial.println("object detected");
digitalWrite(LED, HIGH);
}}
There is a bug where the serial command suche as serial.begin, serial.write and serial.read if they are meant to for debug purposes on your cpu have a blocking effect on your program. I've experienced it once or twice so try commenting those lines out.
Related
So, I know it's probably SUPER simple, but I'm new to arduino and I'm just drawing a blank. I'm making a motion detector with an HC-SRO4 ultrasonic sensor. Right now I have it set so whenever it senses an object within 60 cm, it turns on an LED light, but when the object disappears, the LED turns off. What I would like to happen is that it would stay on until I press a button to reset it. Any help is really appreciated and i thank you in advance.
void setup() {
#define LED 8
#define trigPin 12
#define echoPin 13
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(LED, OUTPUT);
}
void loop() {
int duration, distance;
digitalWrite(trigPin, HIGH);
delayMicroseconds(1000);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1
;if (distance >= 60 || distance <= 0){
Serial.println("no object detected");
digitalWrite(LED, LOW);}
else {
Serial.println("object detected");
digitalWrite(LED, HIGH);
}}
for this you have make low pushbutton pin while pressing.once the oobject came near the flag will set once the set it will move to while loop and run until the button pressed
#define LED 8
#define trigPin 12
#define echoPin 13
#define push_button 5
int flag=0;
void setup() {
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(LED, OUTPUT);
pinMode(push_button,INPUT);
}
void loop() {
int duration, distance;
digitalWrite(trigPin, HIGH);
delayMicroseconds(1000);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
if(digitalRead()==0)
{
flag=0;
}
if (distance >= 60 || distance <= 0){
Serial.println("no object detected");
digitalWrite(LED, LOW);}
else {
Serial.println("object detected");
flag=1;
while(flag=1)
{
digitalWrite(LED, HIGH);}
}}
I created a program that is intended to turn a servo motor 180 degrees then back if an object is within 20cm of the ultrasonic sensor. This works fine except sometimes when the if condition is not met. In this case, the motor doesn't move at all and the distance is put into the serial monitor. This works fine sometimes, but in most cases the serial monitor just prints 0 repeatedly and I have to restart the program for it to work again. Even when I put an object within 20cm of the sensor it still prints 0. I am quite new to Arduino so this really just stumped me haha. Any tips or help would be greatly appreciated.
#include <Servo.h>
Servo servo1; // create servo object to control a servo
#define trigPin 13
#define echoPin 12
void setup()
{
Serial.begin(9600);
servo1.attach(9); // attaches the servo on pin 9 to the servo object
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop()
{
long duration = 0, distance = 0;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
duration = pulseIn(echoPin, HIGH);
distance = (duration / 2) / 29.1;
if(distance > 2 && distance < 20){
servo1.write(180);
Serial.println(distance);
delay(1000);
servo1.write(-180);
}
else{
servo1.write(0);
Serial.println(distance);
}
delay(2000);
}
See what happens when you try this code, as I cleaned it up a little bit:
#include <Servo.h>
#define trigPin 13
#define echoPin 12
Servo servo1; // create servo object to control a servo
void setup() {
Serial.begin (9600);
servo1.attach(9); // attaches the servo on pin 9 to the servo object
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop() {
float duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration / 2) * 29.1;
if (duration) {
if (distance > 2 && distance < 20) {
servo1.write(180);
Serial.println(distance);
delay(1000);
servo1.write(-180);
}
else {
servo1.write(0);
Serial.println(distance);
}
}
delay(2000);
}
I think if you use a float it might work. However, if it doesn't work, try switching up the pin assignments to different pins on the Arduino and see if that works. If the distance measurment is off the best way to adjust it is with the multiplied value in the distance variable in the void loop ().This one works for me.
I am tring to build a line follower robot, i have an h-bridge and arduino to control the direction and speed.
I burnt this code to my arduino board, but the robot just go forward and never go on the oppsite direction:
int enA = 10;
int in1 = 9;
int in2 = 8;
// motor two
int enB = 5;
int in3 = 7;
int in4 = 6;
void setup()
{
pinMode(enA, OUTPUT);
pinMode(enB, OUTPUT);
pinMode(in1, OUTPUT);
pinMode(in2, OUTPUT);
pinMode(in3, OUTPUT);
pinMode(in4, OUTPUT);
}
void demoOne()
{
digitalWrite(in1, HIGH);
digitalWrite(in2, LOW);
analogWrite(enA, 200);
// turn on motor B
digitalWrite(in3, HIGH);
digitalWrite(in4, LOW);
// set speed to 200 out of possible range 0~255
analogWrite(enB, 200);
delay(2000);
// now change motor directions
digitalWrite(in1, LOW);
digitalWrite(in2, HIGH);
digitalWrite(in3, LOW);
digitalWrite(in4, HIGH);
delay(2000);
// now turn off motors
digitalWrite(in1, LOW);
digitalWrite(in2, LOW);
digitalWrite(in3, LOW);
digitalWrite(in4, LOW);
}
void loop()
{
demoOne();
delay(1000);
demoTwo();
delay(1000);
}
How to adjust the code to make it go for both directions?
UPDATE:
I am using h bridge l298n and four dc motors "2 right and 2 left", powering it with two 9v batteries and powering the arduino uno with 5v which i get from the h bridge based on this article:
https://hackerstore.nl/PDFs/Tutorial298.pdf
enA, in1, and in2 for the two right motors
enB, in3, and in4 for the two left motors
Your code looks perfectly fine, make sure your hardware is working properly and that everything is connected properly, also make sure that you are not using the 5V from your Arduino to power the motors since the small voltage regulator on the Arduino board is not capable of handling high currents such as 500mA (Unless you replace it with a bigger regulator and give it a big heatsink), if you are powering the arduino and motors from USB make sure your USB port can handle the power required by the two motors, oh and make sure pins 10 and 5 are PWM pins
Also using a dedicated motor library may help to simplify your code, I wrote you one here:
#include <Arduino.h>
#include <stdbool.h>
#define enA 10
#define enB 5
#define i1 8
#define i2 9
#define i3 6
#define i4 7
void initMotors(){
pinMode(enA, OUTPUT);
pinMode(enB, OUTPUT);
pinMode(i1, OUTPUT);
pinMode(i2, OUTPUT);
pinMode(i3, OUTPUT);
pinMode(i4, OUTPUT);
}
void motor1Stop(){
digitalWrite(i1, LOW);
digitalWrite(i2, LOW);
}
void motor2Stop(){
digitalWrite(i3, LOW);
digitalWrite(i4, LOW);
}
void motorsEnabled(bool en){
digitalWrite(enA, en);
digitalWrite(enB, en);
}
void enableMotors(){
motorsEnabled(HIGH);
}
void motor1Forward(){
digitalWrite(i1, HIGH);
digitalWrite(i2, LOW);
}
void motor1Backward(){
digitalWrite(i1, LOW);
digitalWrite(i2, HIGH);
}
void motor2Forward(){
digitalWrite(i3, LOW);
digitalWrite(i4, HIGH);
}
void motor2Backward(){
digitalWrite(i3, HIGH);
digitalWrite(i4, LOW);
}
To include this just make a new tab and name it whatever you want (as long as there are no spaces and it ends in .h), then add #include "name.h" to the beginning of your code, this will help you to reduce future bugs
For speed control you can add this:
void setMotorSpeeds(int motor1, int motor2){
analogWrite(enA, motor1);
analogWrite(enB, motor2);
}
Your code is fine, so you will need to identify the problem by "divide and conquer"
Connect a single motor to each channel, and forget the arduino part for now.
Connect the L298 power supply. If you read the instructions you will see that you can use the integrated 5V power regulator, or you can supply an external 5V. If using a different power supply for 5V and Motors make sure you connect both GND together otherwise it won't work.
Make sure you have the driver properly connected to power supply, take two cables and use them to connect in1 to GND, in2 to 5V and enA to 5V (without the arduino, just manually connect them with a cable). One of the motors should turn one side.
Now connect in1 to 5V and in2 to GND (keeping enA connected to 5V), the motor should turn to the other side.
If this does not happen then you are not properly connecting the L298 or it is damaged.
If it works then the problem comes from your arduino. Connect 3 LEDs, one in the pin9, one in the pin 8 and one in the pin 10 (which are the pins you connect to in1 and in2 and enA).
Run your program and you should see the LEDS turn on and off accordingly.
If not, your arduino has a problem in some pins (maybe you short circuited them?)
If both experiments work there is absolutely no reason for them to not work together, so start small, divide your problem into pieces and identify it.
Good luck.
I have a ultrasonic sensor (SR04T) that I have connected to my Arduino. I'm using the TX and RX port at the Arduino UNO. The problem is that it only reads value 0 cm. Could anyone help me find the error?
The code I'm using looks like this:
const int trigPin = 1;
const int echoPin = 0;
void setup() {
Serial.begin(9600);
}
void loop()
{
long duration, inches, cm;
pinMode(trigPin, OUTPUT);
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);
// convert time into cm
cm = microsecondsToCentimeters(duration);
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
}
long microsecondsToCentimeters(long microseconds)
{
return microseconds / 29 / 2;
}
You are doing two things incorrectly here.
You are setting pinMode in the Loop. No need for that. Put them in the Setup. You don't need to set pinmode continuously.
You are using pin 0 and 1 for your input and output while using Serial. Serial uses pin 0 and 1 for serial communication. Use other pins for your input and output. Have a look at http://marcusjenkins.com/wp-content/uploads/2014/06/ARDUINO_V2.png
I am doing a basic project in Arduino UNO connecting an Ultra Sonic sensor (HC-SR04) which should print in the serial monitor the distance of the closest object but it always print 0.
This is my code:
long distance;
long time;
void setup(){
Serial.begin(9600);
pinMode(4, OUTPUT);
pinMode(2, INPUT);
}
void loop(){
digitalWrite(2,LOW);
delayMicroseconds(5);
digitalWrite(2, HIGH);
delayMicroseconds(10);
time = pulseIn(4, HIGH);
distance = int(0.017*time);
Serial.print("Distance: ");
Serial.print(distance);
Serial.println(" cm.");
delay(1000);
}
And this is the breadboard:
The primary issue that I see is that your code doesn't match your wiring diagram.
For example, your diagram shows Trig connected to pin 4. The Trig should be the output from your Arduino but you have it defined as an input.
The Echo is connected to pin 2 and it should be an input, but you have it defined as an output.
Finally, in your loop(), you are not even using pin 2 or pin 4, but pins 9 and 8. Another issue is the timing you use in setting the trigger pulse - it does not match the datasheet. I would do something like this (assuming that you are actually connected to the pins shown in your diagram):
#define sensorTrigPin 4
#define sensorEchoPin 2
void setup()
{
Serial.begin(9600);
pinMode(sensorTrigPin, OUTPUT);
pinMode(sensorEchoPin, INPUT);
}
void loop()
{
int pulseWidth = 0;
digitalWrite(sensorTrigPin, HIGH);
delayMicroseconds(10);
digitalWrite(sensorTrigPin, LOW);
pulseWidth = pulseIn(sensorEchoPin, HIGH);
Serial.print("Pulse Width: ");
Serial.print(pulseWidth);
delay(1000);
}
Note that pulseWidth is just the amount of time that it takes from the beginning of the Echo pulse going high to the end of the same pulse (when it goes low). You would still have to calculate the distance based on the value of pulseWidth.
UPDATE BASED ON RECENT EDIT TO THE QUESTION
If you change a portion of your loop() code to this, it should work:
void loop(){
digitalWrite(4, HIGH); //was (2, LOW)
delayMicroseconds(10); //was (5)
digitalWrite(4, LOW); //was (2, HIGH)
//REMOVED EXTRA DELAY
time = pulseIn(2, HIGH); //was (4,HIGH);
... //Keep the rest of your code the same.
}
Try connecting your VCC of the sensor to 3V3 instead of 5V. This might sound odd, but I tried it and it worked well. Also, please make sure that your echo and trig pin match the code.