Also, the button is connected between pin 10 and ground. As mentioned earlier, the 10 th pin of the Arduino is pulled high and as a result, it continuously detects logic HIGH. Now, we will see the theory behind the button press. The power supply to the breadboard can be given from 5V and GND pins of the Arduino UNO. Now connect one end of the switch or button to the 10 th pin of the Arduino and the other end is connected to ground. Hence, 10 th pin of the Arduino will continuously detect logic HIGH. the 10 th pin of the Arduino is pulled high. The next step is to connect a 10 Kilo Ohm resistor between 10 th pin of Arduino UNO and 5V supply i.e. The cathode of the LED is connected to ground. In this circuit, the anode of the LED is connected to 13 th pin (or any other digital pin for that matter) of the Arduino UNO through a current limiting resistor of 1 Kilo Ohms. The schematic for the project is shown below. In this project, we are going to turn on an LED when a button is pushed. For the purpose of this tutorial, we need the following components. In order to explore further in to Arduino, we will design a circuit and write our own sketch for it.

We have also seen how to modify some parameters like LED pin and duration delay. We have seen about comments, setup, loop, pin initialization, driving an output pin as HIGH or LOW and delay function. In the previous tutorial, we have analyzed the “Blink” sketch by understanding different objects of the sketch.

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