This tutorial explains how to take analog output from Arduino. One of the basic tutorials for Arduino. The output is taken on a LED that fades in and fades out. The video of output is also included.
1. Introduction:
A step by step illustrated very basic tutorial for Arduino. Here we are taking analog output on a LED. This LED gets fade in and then fade out.
Arduino gives analog output in range of 0 to 255. Technically the output is digital but in the form of PWM, but it seems to be analog.
Arduino Boards have 6 PWM(Analog Pins) these are PIN No. 3,5,6,9,10,11.
| S.No. | Item | Quantity |
| 1 | Arduino UNO | 1 |
| 2 | Breadboard | 1 |
| 3 | LED | 1 |
| 4 | Resistor 1k | 1 |
| 5 | Jumper | 4 |
2. Building Circuit
Schematic Diagram:
Circuit Layout:
3. Programming:
Once we are done with circuit part, here is our programme to this circuit.
You may download this code (Arduino Sketch) from here.
/*
Tutorial for Analog Output.
Analog output is taken through PWM.
Prepared by Robo India.
www.roboindia.com
*/
int LED_ao = 3; // The LED attached to Pin 3 for analog output.
void setup() {
pinMode(LED_ao, OUTPUT); // Declaring Pin as output.
}
void loop() {
// Range of PWM is 0 to 255. So we are running FOR LOOP for 1 to 255.
for (int brightness=1; brightness<=255; brightness++) // For loop for Fade In effect.
{
analogWrite(LED_ao, brightness); // LED will glow for value of 1 to 255.
delay(20); // Small delay to see fade effect.
}
for (int brightness=255; brightness>0; brightness--) // Same FOR LOOP for Fade out effect.
{
analogWrite(LED_ao, brightness);
delay(20);
}
}
4. output:
Here is the output of this tutorial-
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Content Development Team
Robo India
https://roboindia.com