understand in more detail ou must read this Arduino introduction article. as you read above the same instruction applicable for the rest of all. it means on which pin what will be the mode. here is a word pinMode which carr two words pin & Mode. the whole line meaning is pin number 1 will act as an output pin. ( according to this statement the LED_1 variable which is assigned above on pin 1 will work as an output. there we initiate the program data as given as below for example to set and output and input pins, setting up of baud rate, initiate another peripheral like Bluetooth, wifi, and much more.Īnd there are two curly braces open and close we have to write the statement of function inside in these braces. Void setup is the function to set the initial for the main functions. The second step is to make a void function as given below:. initialize digital pin 13 as an output and pin 2 as input.In the above line, we are assigning and variable LED_1 to the 1 pins of Arduino, variable LED_2 to the 2 pins of Arduino. Then load this sketch and save it as “Switch LED “: Now let’s modify the program above to respond to an input. Removing the delay would mean the two digitalWrite() commands will be separated by less than 100 nanoseconds only! Your eyes would not be fast enough to see the LED blinking if that’s the case. It is necessary to introduce a delay between calls to digitalWrite() so that you can see the blinking. There you see the part where the LED on pin 13 is on and off. The blinking part is inside the loop() function. For the Arduino UNO, that LED is tied to pin 13. Most Arduino boards have at least one onboard LEDs whose digital pin is assigned to the constant LED_BUILTIN. Setting the mode of the pin is usually done inside the setup() function as seen above. Here you have your two “bare minimum” functions: setup() and loop(). the loop function runs over and over again foreverĭigitalWrite(LED_BUILTIN, HIGH) // turn the LED on (HIGH is the voltage level)ĭigitalWrite(LED_BUILTIN, LOW) // turn the LED off by making the voltage LOW initialize digital pin 13 as an output. the setup function runs once when you press reset or power the board
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