Please help with LED!!!

Hello, I am helping my daughter make a book for a school assignment and she'd like to make a single LED light up when one of the pages is opened. I have an LED and a button battery (3V), and I can make it light up when the anonde/cathode are attached to the button cell. But I have no idea how to make it go on and off when the page is opened/closed. Can anyone help me with this? A big thanks in advance!
-Cathy

Two things: You should have a resistor (470 Ohm 1/4Watt) between the cell + and the LED anode.

You need a TILT SWITCH. Here is one you can DIY.

cathyandgracie said:

Hello, I am helping my daughter make a book for a school assignment and she'd like to make a single LED light up when one of the pages is opened. I have an LED and a button battery (3V), and I can make it light up when the anonde/cathode are attached to the button cell. But I have no idea how to make it go on and off when the page is opened/closed. Can anyone help me with this? A big thanks in advance!
-Cathy

Click to expand...

Hi

The first and obvious is the need for some type of switch embedded somehow into the page(s). Possiblly along the lines of those greeting cards that play when opened? Something like that. That would be then first thing that comes to mind for me anyway. There are other switch possibilities like a NO (Normally Open) reed switch that would close when the book was opened, that would require a small piece of magnet attached to an oposing page or the book cover. Bottom line is a switch and how to activate it. Also as MikeMI mentions a tilt switch configured in there. Also Mike covered that a small resistor should likely be added depending on the LED used.

Ron

maybe just a bit of tin foil glued to the pages is enough, not bulky at all...

amando96 said:

maybe just a bit of tin foil glued to the pages is enough, not bulky at all...

Click to expand...

That would light the led when the pages are closed. The OP wants the opposite. Adding another resistor and a transistor would allow the two strips of foil to work.