12/12 Led timer?

How, exactly, are the battery, arduino and LEDs connected together?

Im not using any resistors, or relays, because I dont have any... I Dont think I need it because the leds are connected together

That didn't really answer the question.

dxw00d:
How, exactly, are the battery, arduino and LEDs connected together?

The 9v Battery is connected to the arduino, The LEDS Are connected to pin 13. and GND

Make a clear wiring schema in MS Paint or whatever, Virtual Breadboard is good too :slight_smile:

From what I understand, you connected 60 LEDs to a single pin..? That is really bad because one pin can deliver like 20-25 mA only. You risk damaging your Arduino!

You should use a relay!

Im making the schematic right now...

This is the schematic, Each LED you see in the schematic is actually 15 leds. What should I Do to make it brighter?

So what do you guys think?

No replies? Cmon :frowning:

There is a limit to how much light 30 LEDs will make, but its possible they can be brighter w/out damage.
LEDs have a forward voltage rating, you should not exceed this voltage, which is why you. usually see a resister on each LED. The Arduino should put out 5vs at 40ma per pin, and each LED probably uses 20ma at around 3v. Pin 13 should be resistered, so that you can hook up an LED, w/out resister. If you use a different pin, you probably want to put some resister on your LED, or it may burn up. You can calculate what resister

Heres a wesite that helps you figure out what resister to use with your LEDs. Then use those resisters, and use a different pin on the arduino (13 is resistered, so use 9, or whichever one you like), then change the code to whichever pin you use.

http://ledcalc.com/

If you hooked up an LED directly to the 9volt battery, it should have burned up almost instantly.

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
 */
 
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);    
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(43200000);               // wait for 12 hours
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(43200000);               // wait for 12 hours
}

How can I use 2 pins at once then? IN example pin 13 and 12 are running the same way.

Anyone??

You can actually use many pins at one time. you are using pin 12 for ground, leave that the way it is. Instead of using pin 13, use pin 12, or 11, or 10, or 9...

Here is code configured to use pin 9 instead of 13

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
 */
 
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 9;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);    
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(43200000);               // wait for 12 hours
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(43200000);               // wait for 12 hours
}

Here is code for using one LED on pin 13, AND one LED on pin 9.

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
 */
 
// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 9;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);    
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  digitalWrite(13, HIGH);
  delay(43200000);               // wait for 12 hours
  digitalWrite(led, LOW);
  digitalWrite(13, LOW);     // turn the LED off by making the voltage LOW
  delay(43200000);               // wait for 12 hours
}

read this thread...
http://arduino.cc/forum/index.php/topic,127355.0.html

Hippynerd:
You can actually use many pins at one time. you are using pin 12 for ground, leave that the way it is. Instead of using pin 13, use pin 12, or 11, or 10, or 9...

Here is code configured to use pin 9 instead of 13

/*

Blink
 Turns on an LED on for one second, then off for one second, repeatedly.

This example code is in the public domain.
*/

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 9;

// the setup routine runs once when you press reset:
void setup() {                
 // initialize the digital pin as an output.
 pinMode(led, OUTPUT);    
}

// the loop routine runs over and over again forever:
void loop() {
 digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
 delay(43200000);               // wait for 12 hours
 digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
 delay(43200000);               // wait for 12 hours
}





Here is code for using one LED on pin 13, AND one LED on pin 9.



/*
 Blink
 Turns on an LED on for one second, then off for one second, repeatedly.

This example code is in the public domain.
*/

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 9;

// the setup routine runs once when you press reset:
void setup() {                
 // initialize the digital pin as an output.
 pinMode(led, OUTPUT);    
}

// the loop routine runs over and over again forever:
void loop() {
 digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
 digitalWrite(13, HIGH);
 delay(43200000);               // wait for 12 hours
 digitalWrite(led, LOW);
 digitalWrite(13, LOW);     // turn the LED off by making the voltage LOW
 delay(43200000);               // wait for 12 hours
}

Thanks! Im going to try it like this and see how it goes, Hope I dont have to come back again! Thanks!

It didnt work, the same problem, I think I might have burnt out my arduino :-/

Its kinda hard to tell from here, but my guess is that you got leds backwards, and they wont light, or hooking up leds to 9v batteries has finally burned them up.

The arduino has built in LEDs that should light up when hooked up to power or USB.

100Grand:
It didnt work, the same problem, I think I might have burnt out my arduino :-/

That's certainly possible. I'm sure one of the electronics gurus will be able to tell you the current requirement of thirty parallel LEDs.

dxw00d:

100Grand:
It didnt work, the same problem, I think I might have burnt out my arduino :-/

That's certainly possible. I'm sure one of the electronics gurus will be able to tell you the current requirement of thirty parallel LEDs.

About ten times more than needed to burn an Arduino pin...