Reading Inputs with Pull Up & Pull Down

Shows how to read switches and sensor connected to Arduino.

Aug 15, 2020

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environmental sensing

lights

embedded

data collection

Devices & Components

Arduino Uno Rev3

Tactile Switch, Top Actuated

Resistor 4.75k ohm

Breadboard (generic)

5 mm LED: Red

Software & Tools

Arduino IDE

Project description

Code

Switch Interface

arduino

1//CURIE PROJECTS
2const int ledPin1 = 13; // choose the pin for the  LED1
3const int ledPin2=12;  // choose the pin for the LED1
4const int inputPin1  = 9;  // choose the input pin input1
5const int inputPin2=10;  // choose the input  pin input2
6int SW1State ; // Pullup resistor connected to GPIO 9
7int SW2State;  // Pulldown resistor connected to GPIO 9
8int value1 = HIGH;  // variable for  reading the pin status
9int value2=LOW;
10 
11void setup()
12{
13  pinMode(ledPin1,  OUTPUT);      // declare LED1 as output
14  pinMode(ledPin2, OUTPUT);      // declare  LED2 as output
15  pinMode(inputPin1, INPUT);     // declare switch1 as input  
16  pinMode(inputPin2, INPUT);     // declare switch2 as input 
17}
18 
19void  loop()
20  {
21  value1 = digitalRead(inputPin1);  // read input1 value
22  value2  = digitalRead(inputPin2);  // read input2 value
23          if (value1== HIGH)
24          SW1State = HIGH;
25          if (value1 == LOW)
26          SW1State  = LOW;
27          
28          if (value2== HIGH)
29          SW2State = HIGH;
30          if (value2 == LOW)
31          SW2State = LOW;
32    if(SW1State==HIGH)
33    {
34    digitalWrite(ledPin1,HIGH);
35    }
36    else
37    {
38    digitalWrite(ledPin1,LOW);
39     
40    }
41
42    if(SW2State==HIGH)
43    {
44    digitalWrite(ledPin2,HIGH);
45    }
46    else
47    {
48    digitalWrite(ledPin2,LOW);
49     
50    }
51
52  }

//CURIE PROJECTS
const int ledPin1 = 13; // choose the pin for the  LED1
const int ledPin2=12;  // choose the pin for the LED1
const int inputPin1  = 9;  // choose the input pin input1
const int inputPin2=10;  // choose the input  pin input2
int SW1State ; // Pullup resistor connected to GPIO 9
int SW2State;  // Pulldown resistor connected to GPIO 9
int value1 = HIGH;  // variable for  reading the pin status
int value2=LOW;
 
void setup()
{
  pinMode(ledPin1,  OUTPUT);      // declare LED1 as output
  pinMode(ledPin2, OUTPUT);      // declare  LED2 as output
  pinMode(inputPin1, INPUT);     // declare switch1 as input  
  pinMode(inputPin2, INPUT);     // declare switch2 as input 
}
 
void  loop()
  {
  value1 = digitalRead(inputPin1);  // read input1 value
  value2  = digitalRead(inputPin2);  // read input2 value
          if (value1== HIGH)
          SW1State = HIGH;
          if (value1 == LOW)
          SW1State  = LOW;
          
          if (value2== HIGH)
          SW2State = HIGH;
          if (value2 == LOW)
          SW2State = LOW;
    if(SW1State==HIGH)
    {
    digitalWrite(ledPin1,HIGH);
    }
    else
    {
    digitalWrite(ledPin1,LOW);
     
    }

    if(SW2State==HIGH)
    {
    digitalWrite(ledPin2,HIGH);
    }
    else
    {
    digitalWrite(ledPin2,LOW);
     
    }

  }

Switch Interface

arduino

1//CURIE PROJECTS
2const int ledPin1 = 13; // choose the pin for the   LED1
3const int ledPin2=12;  // choose the pin for the LED1
4const int inputPin1   = 9;  // choose the input pin input1
5const int inputPin2=10;  // choose the input   pin input2
6int SW1State ; // Pullup resistor connected to GPIO 9
7int SW2State;   // Pulldown resistor connected to GPIO 9
8int value1 = HIGH;  // variable for   reading the pin status
9int value2=LOW;
10 
11void setup()
12{
13  pinMode(ledPin1,   OUTPUT);      // declare LED1 as output
14  pinMode(ledPin2, OUTPUT);      // declare   LED2 as output
15  pinMode(inputPin1, INPUT);     // declare switch1 as input  
16   pinMode(inputPin2, INPUT);     // declare switch2 as input 
17}
18 
19void   loop()
20  {
21  value1 = digitalRead(inputPin1);  // read input1 value
22  value2   = digitalRead(inputPin2);  // read input2 value
23          if (value1== HIGH)
24           SW1State = HIGH;
25          if (value1 == LOW)
26          SW1State   = LOW;
27          
28          if (value2== HIGH)
29          SW2State = HIGH;
30           if (value2 == LOW)
31          SW2State = LOW;
32    if(SW1State==HIGH)
33     {
34    digitalWrite(ledPin1,HIGH);
35    }
36    else
37    {
38    digitalWrite(ledPin1,LOW);
39      
40    }
41
42    if(SW2State==HIGH)
43    {
44    digitalWrite(ledPin2,HIGH);
45     }
46    else
47    {
48    digitalWrite(ledPin2,LOW);
49     
50    }
51
52   }

//CURIE PROJECTS
const int ledPin1 = 13; // choose the pin for the   LED1
const int ledPin2=12;  // choose the pin for the LED1
const int inputPin1   = 9;  // choose the input pin input1
const int inputPin2=10;  // choose the input   pin input2
int SW1State ; // Pullup resistor connected to GPIO 9
int SW2State;   // Pulldown resistor connected to GPIO 9
int value1 = HIGH;  // variable for   reading the pin status
int value2=LOW;
 
void setup()
{
  pinMode(ledPin1,   OUTPUT);      // declare LED1 as output
  pinMode(ledPin2, OUTPUT);      // declare   LED2 as output
  pinMode(inputPin1, INPUT);     // declare switch1 as input  
   pinMode(inputPin2, INPUT);     // declare switch2 as input 
}
 
void   loop()
  {
  value1 = digitalRead(inputPin1);  // read input1 value
  value2   = digitalRead(inputPin2);  // read input2 value
          if (value1== HIGH)
           SW1State = HIGH;
          if (value1 == LOW)
          SW1State   = LOW;
          
          if (value2== HIGH)
          SW2State = HIGH;
           if (value2 == LOW)
          SW2State = LOW;
    if(SW1State==HIGH)
     {
    digitalWrite(ledPin1,HIGH);
    }
    else
    {
    digitalWrite(ledPin1,LOW);
      
    }

    if(SW2State==HIGH)
    {
    digitalWrite(ledPin2,HIGH);
     }
    else
    {
    digitalWrite(ledPin2,LOW);
     
    }

   }

Downloadable files

Interfacing Switch

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