Wiimote Project

Hardware Support => IR Pens => Topic started by: dice on September 14, 2009, 04:51:45 PM

Title: Surface Mounted LEDs
Post by: dice on September 14, 2009, 04:51:45 PM
Has anyone tried using Surface Mount LEDs for IR Pens, they are much smaller and some can do 60 degrees or better.  I am wondering if you clustered them together say 4 of them in a pyramid would it work?  and how well.

Just thought about it over the weekend.

Dice
Title: Re: Surface Mounted LEDs
Post by: dsgclan on September 22, 2009, 04:48:39 AM
hi Dice, I've experimented with SMD LED with 3 of them in serial, they worked much better, 3 times brighter than 1, but the problem is 2 batteries do not provide enough voltage or power for 3 LEDs, so I had to use a DC power supply to power them.
I'm thinking to have my colleague design a voltage conversion circuit to raise the voltage of 2 batteries from 3V to 4.5V or 5V.
Title: Re: Surface Mounted LEDs
Post by: dice on September 23, 2009, 08:42:17 AM
If the voltage is the problem could you not just use a 12v battery like the ones they use for Car Alarm remotes?

Wikipedia - Info (http://en.wikipedia.org/wiki/A23_battery)

Video of how to hack (http://www.metacafe.com/watch/773138/12_volt_battery_hack_youll_be_surprised/)

At Target (http://www.target.com/gp/detail.html/192-0838157-3687851?ASIN=B00004YK10&AFID=Froogle&LNM=B00004YK10|Energizer_A23_12V_Battery_AlarmRemote&ci_src=14110944&ci_sku=B00004YK10&ref=tgt_adv_XSG10001) $3.99 for 2

I would figure that using this would be best and get a larger resister to bring the voltage down rather than make something to bring the voltage up.

Dice
Title: Re: Surface Mounted LEDs
Post by: shakespeare1212 on November 11, 2009, 11:15:25 AM
What exact model numbers / company did you get your Surface mount LEDs from?  Are they at the right wave length (940 nm)?

I don't think that you can raise voltage in a DC circuit but you can always throw in more batteries. I am using AG13 button cells in my sword model, 3 of them give me 4.5 volts, and could drive 5 small LEDs if I needed them to.

Cheers.

James.
Title: Re: Surface Mounted LEDs
Post by: dice on November 11, 2009, 01:16:23 PM
yep you can get the 940nm  I have found them from a couple different sources.  Some have 60-120degree view which would be nice.

Dice
Title: Re: Surface Mounted LEDs
Post by: dsgclan on November 16, 2009, 10:25:27 AM
sorry for replying late, the model of LED's I used are also from Vishay, they are tiny LEDs, sorry I forgot the model number, I got them as a few samples by asking Vishay's office in China, I'm sure you can also find it out from Vishay's office in your country?

You are right, using more batteries or higher voltage batteries are much easier, I was just thinking 3 or more batteries would be too heavy for a pen, but it's better than a complicated circuit.