/*
 * Robojax Arduino Step-by-Step Course
 * Lesson 17: NJK-5002C hall proximity sensor
 * This is the Arduino code to use the NJK-5002C hall sensor to control a DC or AC load.
 
  Please watch video instructions here: https://youtu.be/AGXJKU2mHsE
 This code is available at: http://robojax.com/course1/?vid=lecture11
 
 With over 100 lectures free on YouTube! Watch it here: http://robojax.com/L/?id=338
 Get the code for the course: http://robojax.com/L/?id=339 

 * Written by Ahmad Shamshiri for Robojax, www.Robojax.com
 * Date: November 10, 2018, Saturday at 09:34 in Ajax, Ontario, Canada


 * 
 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.
 * This code has been downloaded from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#define sensorPin  2 // pin 2 
#define relayPin 8 // pin

const int wait = 3000;// after switched ON, wait for this amount of time

void setup() {

  	//Robojax Arduino Step-by-Step Course http://robojax.com/L/?id=338
  pinMode(sensorPin, INPUT_PULLUP);// define pin as input for sensor
  // watch video explaining the INPUT_PULLUP
  	//Robojax Arduino Step-by-Step Course http://robojax.com/L/?id=338
  
  pinMode(relayPin, OUTPUT);// define pin as output

  Serial.begin(9600);// initialize serial monitor with 9600 baud.
}

void loop() {
  	//Robojax Arduino Step-by-Step Course http://robojax.com/L/?id=338
  int sensed = digitalRead(sensorPin);// read pin 2 and put the result in the "sensed" variable
  if(sensed == LOW){
    Serial.println("Sensed");
    digitalWrite(relayPin, LOW);// if sensed turn relay ON
    delay(wait);// keep the relay ON for the "wait" amount of time
  }else{
    digitalWrite(relayPin, HIGH);// else turn the relay OFF
    Serial.println("====");
  }
 delay(300);// delay for 0.3 seconds
  	//Robojax Arduino Step-by-Step Course http://robojax.com/L/?id=338
}