How do I make a small flashing led light that flashes avery 7 seconds. The board needs to be about the size of a silver dollar and could be powered by a watch battery.
How do I make a small flashing led light that flashes avery 7 seconds
Aug 26, 2006
3 Replies
There's an LED flasher chip. If you live in the UK, they have (or had?) beginner magazines also.
If it can be powered by 3 or more volts, a 74C14, one resistor, and one capacitor make a fine flasher. google for "schmitt trigger cmos oscillator". Use one gate for the oscillator, the other five in parallel to drive the LED.
If you like software, you could use a PIC. (or any other tiny self-contained CPU)
Yes, that's way overkill for such a simple problem, but it doesn't require any external timing components and sometimes you can think of useful fancy things to do with the extra program memory.
The suespammers.org mail server is located in California. So are all my
other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited
commercial e-mail to my suespammers.org address or any of my other addresses.
These are my opinions, not necessarily my employer's. I hate spam.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required