Build Instructions

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• 1

  Let's Build

  • First connect five push switches to a bread board.
  • Of course you can connect maximum of 1023 switches theoretically to a 8 bit micro controller like Arduino. 
  • then inter connect resistors in between the push switches as shown in the diagram.
  • connect the other end of all the switches to 5v of Arduino, as you can see here I have connected the in such a way that one end is connected to the blue line of the beard board which is connected to the 5v.
  • then from the end of the final switch connect a wire to analog pin A1 of Arduino.
  • then connect a resistor across A1 and GND of Arduino, which is for pull down, That is to keep the value to zero when no switch is pressed.

• 2

  Connect some LEDs

  Let's connect some LEDs to check the functioning of our circuit.

  Connect the LEDs as shown in the circuit,

  • connect all the positive terminal all LEDs to the 5v.
  • connect the negative terminal of each LEDs to the Digital pin D12 to D8 of Arduino respectively.
  • Practically we have to connect the LEDs through resistors for good life time.

• 3

  Coding

  Take a look at the program, all the lines are commented properly. Now let's upload the code and see it in action.

  //www.diyusthad.com
  //https://www.youtube.com/channel/UCjwtJsOrZyH7E6sBr_YJSeA
  //Code by Najad
  
  #define sw A1 //name for analog pin A1
  #define led1 12
  #define led2 11
  #define led3 10
  #define led4 9
  #define led5 8
  
  void setup() 
  {
    Serial.begin(9600);
    pinMode(led1,INPUT); digitalWrite(led1,HIGH); //setting led1 pin HIGH ie LED will be off according to our circuit
    pinMode(led2,INPUT); digitalWrite(led2,HIGH); //setting led2 pin HIGH ie LED will be off according to our circuit
    pinMode(led3,INPUT); digitalWrite(led3,HIGH); //setting led3 pin HIGH ie LED will be off according to our circuit
    pinMode(led4,INPUT); digitalWrite(led4,HIGH); //setting led4 pin HIGH ie LED will be off according to our circuit
    pinMode(led5,INPUT); digitalWrite(led5,HIGH); //setting led5 pin HIGH ie LED will be off according to our circuit
  
  }
  
  void loop() 
  {
    Serial.println(analogRead(sw)); // reading and printing the values from analog pin A1
  
    if(analogRead(sw) >197 && analogRead(sw) <207 )
    digitalWrite(led1,LOW);// LED will turn ON
    else if(analogRead(sw) >248 && analogRead(sw) <258)
    digitalWrite(led2,LOW);// LED2 will turn ON
    else if(analogRead(sw) >333 && analogRead(sw) <343)
    digitalWrite(led3,LOW);// LED3 will turn ON
    else if(analogRead(sw) >509 && analogRead(sw) <514)
    digitalWrite(led4,LOW);// LED2 will turn ON
    else if(analogRead(sw) >1015 && analogRead(sw) <1023)
    digitalWrite(led5,LOW);// LED2 will turn ON
    
  
  }

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