Arduino/Micro/Blink: Difference between revisions

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=Blink LED=
=Blink LED=


==Overview==
==Overview==  


In this article, we go over a simple blink program using the Arduino Micro. This is the same as the [[Hello World Arduino Micro]] circuit, but with the Arduino controlling the voltage of the circuit to make it blink.
In this article, we go over a simple blink program using the Arduino Micro. This is the same as the [[Hello World Arduino Micro]] circuit, but with the Arduino controlling the voltage of the circuit to make it blink.
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''Built-in Arduino Blink Program:''  
''Built-in Arduino Blink Program:''  


{{Scroll box|
<source lang="C">
<source lang="C">


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// the loop function runs over and over again forever
// this sends SOS forever
 
void loop() {
void loop() {
   digitalWrite(13, HIGH);  // turn the LED on (HIGH is the voltage level)
   digitalWrite(13, HIGH);  // turn the LED on (HIGH is the voltage level)
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}
}
</source>
</source>
}}
We'd rather have a more graceful Morse Code library.
==Installing the Arduinomorse Library==
On to the next part of the project: getting Arduino to run Morse Code! See the [[Arduinomorse Library]] page.
==An Arduinomorse Sketch==
Now we can rewrite our sketch to use the arduinomorse library. NOTE THAT IT MUST BE LOWERCASE:


<source lang="c">
This works, for demonstrating how a blink circuit works, but it'd sure be nice to have a Morse Code library and make that code more compact and graceful.
#define PIN_STATUS 12
#include <morse.h>
LEDMorseSender sender(PIN_STATUS);
//SpeakerMorseSender sender(PIN_STATUS);


void setup() {
==Using a Morse Code Library==
    sender.setup();
    sender.setWPM(20);
    sender.setMessage(String("v v v de kc7dbu ar"));
    sender.startSending();
}
void loop() {
    sender.continueSending();
}
 
</source>
 
How does this bad boy work? Well, the morse library contains encodings of letters into dots and dashes. These dots and dashes are then encoded into voltage signals that are dits or dashes. When the voltage is applied, the LED lights up.
 
=Blink Speaker=
 
The next part of the project is to connect a speaker in lieu of an LED, so that we can use that same voltage to generate morse code tones from a speaker.
 
The speaker I used was a 3 - 28 V DC piezoelectric speaker. No resistors were needed, since I was using 5 volts, which was in the range of the speaker.
 
==The Circuit==
 
===Breadboard Diagram===
 
Here is a breadboard layout using Fritzing:
 
[[Image:bb_BlinkSpeaker.png|500px]]
 
As mentioned, pretty straightforward: we're powering the positive and negative buses with the red and black cables, connected to the Arduino's 12 pin and ground, respectively. We then route power from the positive bus to the piezo speaker's red wire, then the voltage passes through the speaker (generating sound), and the remaining voltage passes through the black wire to ground.
 
===Breadboard Photo===
 
Here is a photo of the above circuit, constructed on a breadboard:
 
[[Image:photo_BlinkSpeaker2.jpg|500px]]
 
==Arduinomorse Speaker Sketch Code==
 
Finally, we can use the Arduinomorse library to generate our morse code tones, by switching from a <code>LEDMorseSender</code> object to a <code>SpeakerMorseSender</code> object:
 
<source lang="c">
#define PIN_STATUS 12
#include <morse.h>
//LEDMorseSender sender(PIN_STATUS);
SpeakerMorseSender sender(PIN_STATUS);
 
void setup() {
    sender.setup();
    sender.setWPM(20);
    sender.setMessage(String("v v v de kc7dbu ar"));
    sender.startSending();
}
void loop() {
    sender.continueSending();
}
 
</source>


==Upload and Go==
Here is a link to an article describing a blink circuit using a morse code library:


Once you upload the sketch, your piezo speaker should start sending out morse code.
[[Morse Code Blink Arduino Micro]]




[[Category:Arduino]]
[[Category:Arduino]]

Revision as of 15:12, 19 July 2015

Blink LED

Overview

In this article, we go over a simple blink program using the Arduino Micro. This is the same as the Hello World Arduino Micro circuit, but with the Arduino controlling the voltage of the circuit to make it blink.

In the simple Hello World example, we wanted a constant source of potential, 5 volts, to keep the LED light continuously lit. Now, we want to control the voltage so that we can shut the light on and off. The program we load onto the Arduino microcontroller will allow us to create a logical program to control the voltage.

The Circuit

Breadboard Diagram

The circuit for our blink program is almost exactly the same as for the Hello World program, except now we plug it into a numbered pin on the Arduino board:

Bb Blink1.png

Instead of plugging into the 5V pin, we plug it into the D12 pin.

NOTE: Don't use the D13 pin. It starts with a pulse on-off routine.

Breadboard Photo

The final breadboard arrangement:

Photo Blink1.jpg

Note that we've added three resistors, instead of two. It doesn't particularly matter - as long as the resistance is not too low! (Otherwise we'll burn out our LED.)

The Arduino Sketch Code

The first half is changing the circuit; the other half is changing the logic. The built-in Arduino blink program is useful, but not particularly graceful. It shows us how to toggle the voltage, but it's a bit clunky in how it implements the library. Here it is:

Built-in Arduino Blink Program: 

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  pinMode(13, OUTPUT);
}


// this sends SOS forever

void loop() {
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(200);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(200);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(200);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second

  delay(1000);              // wait for a second

  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(500);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second

  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(500);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second

  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(500);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second

  delay(1000);              // wait for a second

  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(200);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(200);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(200);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(200);              // wait for a second

  delay(1000);              // wait for a second

}

This works, for demonstrating how a blink circuit works, but it'd sure be nice to have a Morse Code library and make that code more compact and graceful.

Using a Morse Code Library

Here is a link to an article describing a blink circuit using a morse code library:

Morse Code Blink Arduino Micro

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