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1  Using Arduino / LEDs and Multiplexing / Re: big led project on: October 14, 2012, 08:36:30 pm
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maybe someone can tell me if im connecting anything wrong ???

You do not need an arduino to try this:

1) power -> led's anode -> led's cathode -> drain;
2) source -> ground;

now, connect gate to power, the leds should light up; then connect gate to ground, the leds should be completely off.


everything works fine if the arduino uno is not there
update;
now i have pluged the arduino GND into the source and thr led strip does what is suppose to do. dont quite inderstand why... thanks for all the help now into the fun part programming would come back if i have any questions
Thank you very much to CrossRoads and everyone else that helped
2  Using Arduino / LEDs and Multiplexing / Re: big led project on: October 13, 2012, 03:15:01 am
hello... so i went back and got a irfz24n mosfet got everything together (im including a pic) and most of it is working w/o a problem 1 little detail is im not able to make the strip turn off completely ive been playing with different basic programs but to no luck as to turn the strip completely off, ive also tried different connections the strip does dim a lot more if i connect the source to led - instead of drain to -....... maybe someone can tell me if im connecting anything wrong ???

thanks for all the help
3  Using Arduino / LEDs and Multiplexing / Re: big led project on: October 10, 2012, 11:06:56 pm
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You don't have to have those resistors.


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the MOSFETS I could not find in the stores they had some IRF***

Whether those mosfets work will depend on what led stripes you have. If those are rated at different voltages and have no means of self-regulating the current, hanging them to the highest voltage will surely burn them instantaneously.

If you are switching indeed 1amp or so, something like IRF540 (a dime a dozen) would handle, even at 5v.

I would spend more time understanding the led stripes before doing anything.

the led strips do have resistors some lights are 223, 410 and some are 270 i think its very hard to read the numbers off them im gonna try to include a pic if it allows me and also i am including a link to the strips webpage.
http://www.current-usa.com/aquarium-led-lights/truelumen-pro-led-striplights
Sorry I forgot to say the strips I'm using are 3002 and 3003
4  Using Arduino / LEDs and Multiplexing / Re: big led project on: October 10, 2012, 03:12:35 pm
Hey crossroads it's me again I should have xplained better myself I was looking in some local stores but they didn't have the resistors for 180ohms but I finally found them 180ohms 1/2 watt, the MOSFETS I could not find in the stores they had some IRF*** some numbers but all were 100v or more not too sure if I can use those if not... Not big deal I saw the one u posted a link to and would go with those... All it's left for me to get is the MOSFETS so I'll order them online and start working on it thanks for the help
5  Using Arduino / LEDs and Multiplexing / Re: big led project on: October 07, 2012, 10:10:45 pm
Hello CrossRoads I'm back, been doing a lot of reading, got the arduino UNO and been looking for the resistors but apparently these are hard to find.... Anyways Got a few questions I can't find any info on how the MOSFET will convert the voltage from 5 to 12 and 24v??? Will i need a mosfet driver or will the arduino do it?? Which mosfet will I use for the 24v led strips and which one will I use for the 12v strip??? Also u gave an example of 30mA going out of the arduino, I believe to find the amperage of the light Is the wattage divided by the voltage right?? In that example why 30mA??, where does that figure comes from? Is that for the MOSFET or the lights?? Maybe that depends on the type of MOSFET to be used if it is for this??
I'm sorry for the ignorance but it hasrelly been long time since I did something like this.
And trully never worked with MOSFETS And thank you for the help
6  Using Arduino / LEDs and Multiplexing / Re: big led project on: September 12, 2012, 02:08:54 pm
Thanks for the replay CrossRoads it looks so simple in that diagram I'm going to order the UNO and c where I stand. In the diagram I c some resistor in each line going to the led strip it's been so long since I did a project like this I want to know how can I calculate what resistors I will need for each line ?? Or will that be the MOSFET in each line  ???

Thanks
7  Using Arduino / LEDs and Multiplexing / big led project on: September 11, 2012, 10:17:03 pm
hello everyone im new smiley-mr-green , been checking out the arduino for a couple  weeks and i would like to start a project. i got me 3 strips of leds lights and i was thinking to plug them into different timers that i was going to purchase at the local hardware store but the arduino project seems more fun and i can make more out of it in the future..... so here is my project 3 led strips, 2 running 9.1w at 24v and the 3rd running 10w 12v. i was wondering if i can put all 3 strips on one of the boards???? if so can i run them with different voltage and timers??? that being said how do i go about choosing a board? also i want to add buttons in case i want to override the preset timers...
if all this is possible which i think it is for what ive been reading i know it would be alot of work  smiley-eek-blue but im up for the task.

thanks
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