Hi everyone,
Why arduino executes this function continuously even if the push button isn't pressed?
{
if (digitalRead(Exit) == HIGH)
{
if (Available != CAPACITY) {
Available++;;
myservo.write(BarUp);;
delay(3000);
myservo.write(BarLow);
}
}
//========================
This is the sketch:
#include <LiquidCrystal.h>
#include <Servo.h>
#include <SPI.h>
#include <MFRC522.h>
Servo myservo;
#define ServoM 6
#define Exit 16
#define BarLow 177 //Low position of the barrier.
#define BarUp 95 //Up position of the barrier.
#define CAPACITY 8 //Capacity
#define SS_PIN 10
#define RST_PIN 9
#define redLed 14
#define greenLed 15
MFRC522 mfrc522(SS_PIN, RST_PIN);
LiquidCrystal lcd(8, 7, 5, 4, 3, 2);
void setup() {
Serial.begin(9600);
SPI.begin();
mfrc522.PCD_Init();
myservo.attach(ServoM);
Serial.println("Approximate your card to the reader...");
Serial.println();
myservo.write(BarLow);
pinMode(Exit, INPUT);
pinMode(redLed, OUTPUT);
pinMode(greenLed, OUTPUT);
lcd.begin(16, 2);
}
int Available = 9; // Number of places available.
//================================================================
void loop() {
if (digitalRead(Exit) == HIGH)
{
if (Available != CAPACITY) {
Available++;;
myservo.write(BarUp);;
delay(3000);
myservo.write(BarLow);
}
}
if (Available == 0) {
lcd.setCursor(0, 0);
lcd.print("Full");
} else {
lcd.setCursor(0, 0);
lcd.print("Empty : ");
lcd.print(Available);
}
{
if (Available >= 1) {
digitalWrite(greenLed, HIGH);
digitalWrite(redLed, LOW);
} else {
digitalWrite(greenLed, LOW);
digitalWrite(redLed, HIGH);
}
{
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent())
{
return;
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial())
{
return;
}
//Show UID on serial monitor
Serial.print("UID tag :");
String content = "";
byte letter;
for (byte i = 0; i < mfrc522.uid.size; i++)
{
Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
Serial.print(mfrc522.uid.uidByte[i], HEX);
content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
content.concat(String(mfrc522.uid.uidByte[i], HEX));
}
Serial.println();
Serial.print("Message : ");
content.toUpperCase();
if (content.substring(1) == "2C 61 A8 B2")
{ if (Available != 0) {
Available--;
myservo.write(BarUp);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("open bar");
lcd.setCursor(0, 1);
lcd.print("warning");
delay(5000);
myservo.write(BarLow);
lcd.clear();
}
}
}
}
}
