1/21/2024 0 Comments Arduino uno led datasheet![]() ![]() This on/off alternation will not stop until the control board runs out of energy.ĭigitWrite(Pin): Write a HIGH or a LOW value to a digital pin. The MCU will run this program repeatedly and you will see that the LED brightens for 500ms and then dims for 500ms. Set ledPin as LOW to turn the LED off and also delay 500ms. ![]() This program is to set ledPin as HIGH to turn on the LED, with a delay of 500ms. Otherwise there will be errors in compiling. Even when no pins need to be initialized, you still need this function. The void before the setup means that this function will not return a value. PinMode(Pin): Configures the specified pin to behave either as an input or an output. The setup() function here sets the ledPin as OUTPUT. It will not stop unless something happens like power outages. The loop() function contains what the MCU will run circularly. The setup() function is usually used to initialize the digital pins and set them as input or output as well as the baud rate of the serial communication. You can also directly use pin 9 instead.Ī typical Arduino program consists of two subprograms: setup() for initialization and loop() which contains the main body of the program. In the following code, ledPin stands for pin 9. You should define every variable before using in case of making mistakes. ![]()
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