Hello All
I was wondering if it was wondering if it was easy enough to create a Cell Phone Charm with an LED
Like on of these:
http://www.play.com/Toys/Toys/4-/10...tml?_$ja=tsid:11518|cat:10333380|prd:10333380

When your mobile phone receives a call, it would light up.

I heard you need an Electromagnetic field sensor?

Does anyone have a clue to how this could be made?

Dual

 

EM sensor can also get a false trigger or a cross call. An o/p interface from the mobile would be a better approach, but that will need a small hardware to sit on the mobile.

what is that you want to acheive infact?

 

These have been available for years in pens, keychains, etc.

Probably cheaper to buy one but here is a schematic:

http://www.electrokits.com/Telephone/Mobile-Phone-Call-Detector

 

To the first reply: i was thinking of modifying my mobile put a small hole in it's cover to show a blinking light when it rang.

Thanks for the elctrokit link that's what I needed. Looks pretty easy
Although your right there are some cheap gadgets with them in I think il just buy something.
Dual

 

Don't modify your mobile.

They are tested extensively to maintain proper safety against SAR (radiation exposure). Modifying, even in the most seemingly insignificant way(s), may impair it's sensitivity and other factors which will result in adverse operating performance including battery life.