### Project 9 Digital Push Button

![](media/image-20251124174803530.png)

**1.Introduction**
This is a basic application module. You can simply plug it into an IO shield to have your first taste of Arduino.

Advantages:

- Wide voltage range from 3.3V to 5V
- Standard assembling structure (two 3mm diameter holes with multiple of 5mm as distance from center)
- Easily recognizable interfaces of sensors ("A" for analog and "D" for digital)
- Icons illustrate sensor function clearly
- High quality connector
- Immersion gold surface

**2.Specification**

- Supply Voltage: 3.3V to 5V
- Easy to 'plug and operate'
- Large button keypad and high-quality first-class cap
- Achieve interesting and interactive work
- Interface: Digital
- Size: 30*20mm
- Weight: 4g

**3.Connection Diagram**

![](media/image-20251125173809196.png)

**4.Sample Code**

```c
int ledPin = 13;                // choose the pin for the LED
int inputPin = 3;               // Connect sensor to input pin 3 

void setup() 
{
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare pushbutton as input
}

void loop()
{
  int val = digitalRead(inputPin);  // read input value
  if (val == HIGH) 
  {            // check if the input is HIGH
    digitalWrite(ledPin, LOW);  // turn LED OFF
  } 
  else 
  {
    digitalWrite(ledPin, HIGH); // turn LED ON
  }
}
```