Hello all,
I am currently working on the coding for a conveyor belt system.
I have designed it to operate with the use of sensors. I am using an OFF push button and an ON push button both of which are momentary to disengage and engage the system respectively.
In the desired operation once the ON push button has been pressed a green LED will indicate the system is active. There is a START sensor located at the beginning of the conveyor belt and a STOP sensor located at the end of the conveyor belt. With the system activated if the Start sensor detects an object the motor shall turn on and start to move the belt and a yellow LED shall also turn on indicating the belt is in motion. Once the object reaches the end of the belt it shall be detected by the STOP sensor and this should turn off the motor and yellow LED.
If the OFF push button is pressed the system shall become inactive and a red LED will light up indicating the system is disengaged.
Main Components used:
Arduino Mega as my micro-controller
3 LED's (green, yellow, red)
DC motor (6volt)
2 ultrasonic sensors (HC-SR04)
The codes that i have drafted do not seem to be able to function properly.
I have posted my latest draft.
ANY help is much appreciated!
Thank you.
/*
This code is designed to control a conveyor system
*/
// Define pins for ultrasonic
int const trigPin = 10; //trigger pin for start sensor
int const echoPin = 9; // echo pin for start sensor
int const trigPin1 = 12; //trigger pin for stop sensor
int const echoPin1 = 11; //echo pin for stop sensor
int motorPin = 4; //conveyor belt motor
int const buttonPin = 2; //ON pushbutton pin
int const buttonPin1 = 3; //Off pushbutton pin
int const GreenledPin = 5; //system ON LED pin
int const YellowledPin = 6; //motor ON LED pin
int const RedledPin = 7; // system OFF LED pin
boolean Redbuttonstate = LOW;
boolean Blackbuttonstate = LOW;
boolean controlstate = LOW;
// variables will change:
//int ONbuttonState = 1; // variable for reading the pushbutton status
//int OFFbuttonState = 1; // variable for reading the pushbutton status
void setup() {
pinMode(trigPin, OUTPUT); // trig pin will have pulses output for start sensor
pinMode(echoPin, INPUT); // echo pin should be input to get pulse width for the start sensor
pinMode(trigPin1, OUTPUT); // trig pin will have pulses output for the stop sensor
pinMode(echoPin1, INPUT); // echo pin should be input to get pulse width for the stop sensor
pinMode(motorPin, OUTPUT); // motor pin
pinMode(GreenledPin, OUTPUT); // system ON LED
pinMode(YellowledPin, OUTPUT); // motor ON LED
pinMode(RedledPin, OUTPUT); // system OFF LED
pinMode(buttonPin, INPUT); // ON push button(momentary)
pinMode(buttonPin1, INPUT); // OFF push button(momentary)
}
void loop() {
Redbuttonstate = digitalRead(buttonPin);
Blackbuttonstate = digitalRead(buttonPin1);
//if button is pressed system should be on and allow motor to be turned on and off by the start and stop sensors
if (Redbuttonstate == HIGH) {
digitalWrite(controlstate, HIGH); //red button is the ON button so controlstate is HIGH to allow the conveyor system to operate
}
if (Blackbuttonstate == HIGH) {
digitalWrite(controlstate, LOW); //black button is the OFF button so controlstate is LOW to enable red LED and not allow conveyor system to operate.
}
while (controlstate = HIGH) {
// Duration will be the input pulse width and distance will be the distance to the obstacle in centimeters
int duration, distance; // distance and duration for the START sensor
// Output pulse with 1ms width on trigPin
digitalWrite(trigPin, HIGH);
delay(1);
digitalWrite(trigPin, LOW);
// Measure the pulse input in echo pin
duration = pulseIn(echoPin, HIGH);
// Distance is half the duration devided by 29.1
distance = (duration/2) / 29.1; //distance of object from Start sensor
int duration1, distance1; // distance and duration for the STOP sensor
// Output pulse with 1ms width on trigPin
digitalWrite(trigPin1, HIGH);
delay(1);
digitalWrite(trigPin1, LOW);
// Measure the pulse input in echo pin
duration1 = pulseIn(echoPin1, HIGH);
// Distance is half the duration devided by 29.1
distance1 = (duration1/2) / 29.1; // distance of object from STOP sensor
digitalWrite(GreenledPin, HIGH); //green LED ON because system is active
if (distance <= 10 && distance >= 0) {
digitalWrite(motorPin, HIGH); // if START sensor detects an object within 10cm motor is activated and belt begins to turn
digitalWrite(YellowledPin, HIGH); // Yellow LED is on indicating that the conveyor bely is in motion
}
if (distance1 <= 10 && distance1 >= 0) {
// Motor off
digitalWrite(motorPin, LOW); // if STOP sensor detects an object within 10 cm motor should turn OFF
digitalWrite(YellowledPin, LOW); //Yellow LED off because the system is no longer in motion
}
delay(60);
}
while (controlstate == LOW) {
digitalWrite(RedledPin, HIGH); // Red LED is off while the system is off
}
}