Once you've understood this example, check out the DigitalReadSerial example to learn how read a switch connected to the board.ĪnalogReadSerial - Read a potentiometer, print its state out to the Arduino Serial Monitor.īareMinimum - The bare minimum of code needed to start an Arduino sketch.ĭigitalReadSerial - Read a switch, print the state out to the Arduino Serial Monitor.įade - Demonstrates the use of analog output to fade an LED. Once you've understood the basic examples, check out the BlinkWithoutDelay example to learn how to create a delay while doing other things. When you use the delay() command, nothing else happens for that amount of time. In between the on and the off, you want enough time for a person to see the change, so the delay() commands tell the board to do nothing for 1000 milliseconds, or one second. That takes the LED_BUILTIN pin back to 0 volts, and turns the LED off. That creates a voltage difference across the pins of the LED, and lights it up. In the main loop, you turn the LED on with the line: The first thing you do is to initialize LED_BUILTIN pin as an output pin with the line You may also load it from the menu File/Examples/01.Basics/Blink. The value of the resistor in series with the LED may be of a different value than 220 ohm the LED will lit up also with values up to 1K ohm.Īfter you build the circuit plug your Arduino board into your computer, start the Arduino Software (IDE) and enter the code below. In the diagram below we show an UNO board that has D13 as the LED_BUILTIN value. Connect the short leg of the LED (the negative leg, called the cathode) to the GND. Connect the long leg of the LED (the positive leg, called the anode) to the other end of the resistor. If you want to lit an external LED with this sketch, you need to build this circuit, where you connect one end of the resistor to the digital pin correspondent to the LED_BUILTIN constant. Here is the correspondence between the constant and the digital pin. This constant is LED_BUILTIN and allows you to control the built-in LED easily. To make your life easier, we have a constant that is specified in every board descriptor file. This LED is connected to a digital pin and its number may vary from board type to board type. This example uses the built-in LED that most Arduino boards have. This example shows the simplest thing you can do with an Arduino to see physical output: it blinks the on-board LED.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |