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Arduino
Arduino Forum Arduino Uno Rev 3 + MIT App Inventor + Bluetooth Module HC05 + Door Magnetic Switch
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Arduino Uno Rev 3 + MIT App Inventor + Bluetooth Module HC05 + Door Magnetic Switch

kikovader
kikovader over 5 years ago

Hello, so this is my first time learning on how to use a Microcontroller like Arduino Uno and currently, I am planning to do on some mini project which uses these items below:

1. Arduino Uno Rev 3

2. Bluetooth Module HC-05

3. An App to receive the data which I created using MIT App Inventor

4. Door Magnetic Switch.

 

 

To be very honest I do not know where to start but I have already designed the User Interface of the Application without the Programming Block. I want it to work in away, when the Door Magnetic Switch formed closed circuit, it will send 1 or "ON" in the App through the Arduino Uno. However, when the Door Magnetic Switch formed an open circuit, it will send "0" of "OFF" in the App.

 

Is this possible?

Please help me. I am begging you. Please imageimage


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  • neilk
    neilk over 5 years ago in reply to kikovader +4 suggested
    Looking at your Arduino code, I can see that you are intending to connect the HC-05 Bluetooth module directly to the hardware Rx and Tx of the Arduino. Whilst this will work, it can be unreliable. It's…
  • neilk
    neilk over 5 years ago in reply to kikovader +4 verified
    Hi Kim Here is a slightly modified version of your Arduino Sketch: //Define the pins being used. //Connect the Door Magnetic Switch or Sensor to pin 4. // int ledOpen=2; int ledClose=3; int switchReed…
  • neilk
    neilk over 5 years ago in reply to kikovader +4 suggested
    You are welcome, Kim. Very pleased that it worked for you . You can't change the colour of the text you send from the Arduino to the App. You can, however, change the colour of the text displayed in the…
Parents
  • dougw
    0 dougw over 5 years ago

    The state can be changed in the UNO firmware or the App Inventor software with one or two lines of code or it can be changed in the hardware at the switch by altering how the magnetic switch is connected. Which method would you prefer?

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  • kikovader
    0 kikovader over 5 years ago in reply to dougw

    I am planning go display change of state in the MIT App Inventor Application which I built. In a way that, I want to use this App to monitor whether the door is close or open.

    I am just confused whether my codes in the Adruino IDE is correct and at the same I am also doubting my programming block in MIT App Inventor.

    Do you think it is possible to do this Sir?

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  • dougw
    0 dougw over 5 years ago in reply to kikovader

    I expect if you post your code here, the members will provide advice.

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  • kikovader
    0 kikovader over 5 years ago in reply to dougw

    Hi Sir, I am sorry for the delay in replying to your help. But here is the code:

     

     

     

    //Define the pins being used.

    //Connect the Door Magnetic Switch or Sensor to pin 4.

    int ledOpen=2;

    int ledClose=3;

    int switchReed=4;

     

     

    //When the Door Magnetic Switch formed Closed Circuit = 1

    //When the Door Magnetic Swich formed Open Circuit = 0

     

     

    void setup()

    {

      //Initialize serial communication with Bluetooth Module HC-05

     

      Serial.begin(9600); //Serial.begin is used to set the speed of communication in bits per second. By default it is 9600. In short, changing the number will change the speed of transferring data.

      //Set the speed of transferring data to default speed.

     

     

      pinMode(ledOpen, OUTPUT);

      pinMode(ledClose, OUTPUT);

      pinMode(switchReed, INPUT);

     

     

    }

     

     

    void loop()

    {

     

     

      if (digitalRead(switchReed)==HIGH)

        {

          digitalWrite(ledOPen, LOW);

          digitalWrite(ledClose, HIGH);

          Serial.print("detected");

        }

      else

        {

          digitalWrite(ledOpen, HIGH);

          digitalWrite(ledClose, LOW);

          Serial.print(notDetected");

        }

        delay(100);

    }

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  • Jan Cumps
    0 Jan Cumps over 5 years ago in reply to kikovader
    digitalWrite(ledOPen, LOW);

     

    You need to fix a typo in this line. Lower case P

     

     

    Serial.print(notDetected");

     

     

    Opening quotes missing.

     

     

    You could take care to only communicate if the status of the reedswitch changed between digital reads.

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  • Jan Cumps
    0 Jan Cumps over 5 years ago in reply to kikovader
    digitalWrite(ledOPen, LOW);

     

    You need to fix a typo in this line. Lower case P

     

     

    Serial.print(notDetected");

     

     

    Opening quotes missing.

     

     

    You could take care to only communicate if the status of the reedswitch changed between digital reads.

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