FAQFAQ   GalleryGallery   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in   Forum RSS Feed   Hacked Gadgets Main Site 

Help with Blue Bawls Automatic LED Light
Goto page 1, 2  Next
 
Post new topic   Reply to topic    Hacked Gadgets Forum Index -> LED Projects
View previous topic :: View next topic  
Author Message
Omar Masaud
Guest





PostPosted: Wed Aug 23, 2006 7:56 pm    Post subject: Help with Blue Bawls Automatic LED Light Reply with quote

Hello. I recently found this tutorial on Instructables and I am in love.
I want to make this, but I am having some problems. There are so many types of LEDs and Transistors, I am not sure which ones to get. Would someone be kind enough to find me which one of these leds is good for this project (from my local hardware shop's site:)

http://www.thesourcecc.com/estore/Category.aspx?language=en-CA&catalog=Online&category=LEDs&pagenum=1&sort=5

and which one of these transistors I can use:
http://www.thesourcecc.com/estore/Category.aspx?language=en-CA&catalog=Online&category=Semi+Conductors%2fIC's&sort=5&pagenum=2&cpid=

Also, does this photocell work?
http://www.thesourcecc.com/estore/Product.aspx?language=en-CA&catalog=Online&category=Misc_Parts&product=2761657

Thank you SO MUCH! SOOOO MUCH!
Back to top

Omar Masaud
Guest





PostPosted: Wed Aug 23, 2006 8:04 pm    Post subject: Sorry, Reply with quote

Sorry, the link got messed up. The link to the resistor is:
http://www.thesourcecc.com/estore/Product.aspx?language=en-CA&catalog=Online&category=Semi+Conductors%2fIC's&product=2761617

Or just search for items with the product number of 2761617
Back to top
Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Thu Aug 24, 2006 12:47 am    Post subject: Reply with quote

Hi Omar,

If you want white light this one should work fine:
http://www.thesourcecc.com/estore/Product.aspx?language=en-CA&catalog=Online&category=LEDs&product=2760320
not sure about its brightness compared to this one though...
http://alan-parekh.vstore.ca/product_info.php/cPath/4_6/products_id/14

Hard to tell about the transistor, it doesn't specify what type they are other than NPN. You should be fine though since almost any generic NPN will do.

As for the photocell, you need one that has high resistance when in darkness. That is the most common. There might be some others in the 5 pack but there is sure to be lost of this type.

Have fun, post a pic or two when you are done Very Happy
Back to top
View user's profile Send private message Send e-mail
Weiss
HG Junior


Joined: 21 Aug 2006
Posts: 16
Location: Denmark

PostPosted: Thu Aug 24, 2006 12:51 am    Post subject: Reply with quote

Hey Omar.

What tutorial is it?? If you link ot it, it will be easier to finde the components youl need.

W
Back to top
View user's profile Send private message Visit poster's website
Omar Masaud
HG Junior


Joined: 24 Aug 2006
Posts: 24

PostPosted: Thu Aug 24, 2006 6:40 am    Post subject: Archived Reply with quote

Archived

Last edited by Omar Masaud on Fri Oct 14, 2011 11:06 pm; edited 1 time in total
Back to top
View user's profile Send private message
Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Thu Aug 24, 2006 4:44 pm    Post subject: Reply with quote

Glad to see you signed up Smile

Normally you have to be careful when using LEDs with different forward voltages however this circuit has been made in such a way that it is very forgiving. You can use a red LED with no concerns.
Back to top
View user's profile Send private message Send e-mail
Omar Masaud
HG Junior


Joined: 24 Aug 2006
Posts: 24

PostPosted: Thu Aug 24, 2006 5:08 pm    Post subject: Archived Reply with quote

Archived

Last edited by Omar Masaud on Fri Oct 14, 2011 11:07 pm; edited 1 time in total
Back to top
View user's profile Send private message
Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Thu Aug 24, 2006 5:32 pm    Post subject: Re: Darn Reply with quote

Omar Masaud wrote:
Thank you very much Smile.

I have seemed to do something very stupid. I bought 1/8 Watt Resistors, instead of the 1/4. Grah. Is there anything I can do?

Thanks for being so helpful. It must be annoying to have a newbie keep questioning you.


You will be fine. Most red LEDs have a forward voltage of 2 Volts. That will give you 7 Volts across the resistor with a current of about 15mA. Power (Watts) is calculated by A * V.

Therefore we get 0.015A * 7V = 0.105W

Your 1/8 Watt resistor is good for 0.125 Watts so it may get warm but you will be OK.

Alan
Back to top
View user's profile Send private message Send e-mail
Omar Masaud
HG Junior


Joined: 24 Aug 2006
Posts: 24

PostPosted: Fri Aug 25, 2006 5:24 am    Post subject: Archived Reply with quote

Archived

Last edited by Omar Masaud on Fri Oct 14, 2011 11:07 pm; edited 1 time in total
Back to top
View user's profile Send private message
Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Aug 25, 2006 5:10 pm    Post subject: Re: =) Reply with quote

Omar Masaud wrote:
The photocells are all different sizes. Most people suggested I try them all (before I solder the connection), is there some other way I can identify which ones to use?


Yes, if you have a meter put it on the OHM setting and check for low resistance when in bright light and high resistance when in total darkness.

Alan
Back to top
View user's profile Send private message Send e-mail
Omar Masaud
HG Junior


Joined: 24 Aug 2006
Posts: 24

PostPosted: Sat Aug 26, 2006 5:08 pm    Post subject: Archived Reply with quote

Archived

Last edited by Omar Masaud on Fri Oct 14, 2011 11:07 pm; edited 1 time in total
Back to top
View user's profile Send private message
Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sat Aug 26, 2006 5:46 pm    Post subject: Re: Okay Reply with quote

Omar Masaud wrote:
The transistor is a 2N 4401, I read the little diagrams on the back of the package, and they told me which pin is the emitter and collector) but apparently, your instructions have the two flipped.


Not sure why it would be dim, but if the collector emitter is reversed will cause issues. Where do I have the a picture with flipped pins, I would like to correct that...
Back to top
View user's profile Send private message Send e-mail
Omar Masaud
HG Junior


Joined: 24 Aug 2006
Posts: 24

PostPosted: Sat Aug 26, 2006 7:01 pm    Post subject: Archived Reply with quote

Archived

Last edited by Omar Masaud on Fri Oct 14, 2011 11:07 pm; edited 1 time in total
Back to top
View user's profile Send private message
Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sat Aug 26, 2006 10:51 pm    Post subject: Re: Oh No.. Reply with quote

Glad you got it going Cool

Thanks for the info on the wrong resistor link, it is fixed...

Strange that the Radio Shack (The Source) would have a wrong diagram on the box.
Back to top
View user's profile Send private message Send e-mail
Omar Masaud
HG Junior


Joined: 24 Aug 2006
Posts: 24

PostPosted: Mon Aug 28, 2006 11:03 am    Post subject: Archived Reply with quote

Archived

Last edited by Omar Masaud on Fri Oct 14, 2011 11:07 pm; edited 1 time in total
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Hacked Gadgets Forum Index -> LED Projects All times are GMT - 6 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Powered by phpBB © 2001, 2005 phpBB Group