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Author Topic: 12/12 Led timer?  (Read 6156 times)
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Grand Rapids Mi
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Code:
/*
  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
}

This is a modied version of the very first arduino project, blink. it originally blinks an LED on pin 13. The only thing I did to change this program was to change the timing from 1 second, to 12 hours.

My guess is that you will need more than 40ma, so you will need to use transistors or relays to switch to higher current devices, but the code is still the same.


Honestly, i think the cheapo 24 hour switch thing like someone previously mentioned would be more appropriate.

Like the previous code example, this would only do the flowering lights, which is really all you need, the other room would be lighted 24/7, and not need anything to control that.

I would be interested to find out how well LEDs work for growing. Most setups that i have seen require their own service panel, lots of expensive lights that use crazy amounts of current, and enclosures with fans to keep the lights from heating everything too much.

How many LEDs are you using? Im guessing it must be thousands.

Thanks so much! ive been looking for something JUST LIKE THIS!!! smiley-grin
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Eugene, Oregon
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Yer welcome buddy. Good luck.
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Grand Rapids Mi
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Code:
/*
  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
}

This is a modied version of the very first arduino project, blink. it originally blinks an LED on pin 13. The only thing I did to change this program was to change the timing from 1 second, to 12 hours.

My guess is that you will need more than 40ma, so you will need to use transistors or relays to switch to higher current devices, but the code is still the same.


Honestly, i think the cheapo 24 hour switch thing like someone previously mentioned would be more appropriate.

Like the previous code example, this would only do the flowering lights, which is really all you need, the other room would be lighted 24/7, and not need anything to control that.

I would be interested to find out how well LEDs work for growing. Most setups that i have seen require their own service panel, lots of expensive lights that use crazy amounts of current, and enclosures with fans to keep the lights from heating everything too much.

How many LEDs are you using? Im guessing it must be thousands.

Im using about 30 leds would it be sufficient? lol just a test
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Grand Rapids Mi
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its not bright enough how do I Fix this?
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Grand Rapids Mi
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Im using this code with  30 leds but its not bright enough? I Dont have any more relays ect, If i put the brightness on a scale of 1 - 10 its 5, but when I hook it up to a 9v battery its  bright smiley-sad

Code:
/*
  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
}
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Gosport, UK
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How are the LEDs being powered?
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Gosport, UK
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Didn't you ask this in your existing thread?
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Grand Rapids Mi
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Didn't you ask this in your existing thread?
Yes, Sorry, its just that I didnt think nobody would look at it.
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Grand Rapids Mi
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By a 9v Battery but when I Connect the leds directly to the battery its bright... when the 9v battery is connected to the arduino its really low  brightness
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Gosport, UK
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How, exactly, are the battery, arduino and LEDs connected together?
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Grand Rapids Mi
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Im not using any resistors, or relays, because I dont have any... I Dont think I need it because the leds are connected together
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Gosport, UK
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That didn't really answer the question.
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Grand Rapids Mi
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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
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France
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Scientia potentia est.
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Make a clear wiring schema in MS Paint or whatever, Virtual Breadboard is good too smiley

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!
« Last Edit: October 16, 2012, 08:39:57 am by guix » Logged

Grand Rapids Mi
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Im making the schematic right now...
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