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Simple Forever LED Flasher

Basic 3 transistor LED flasher that should last around 10 years on a single CR2032 battery.

customelectronicsCustomElectronics
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low power led discrete components

This project was created on 06/07/2023 and last updated 2 years ago.

Description

This circuit pulses an LED at an adjustable rate (set by capacitor size chosen and charging resistor) ranging from several Hz down to once every few minutes or so. The flashes are fairly bright and can be noticed from many yards away in slightly dim lighting.

Details

Files

SMD Pulser No Boost Basic 5mm LED V2_2023-06-07.zip

Gerber Files for the PCB

x-zip-compressed - 15.49 kB - 06/07/2023 at 19:39

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Ken Yap wrote 06/08/2023 at 00:31 • point

If you use blue or white LEDs they are much brighter but you'll have to use 3V cells because of the higher forward voltage.

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aaaaaa wrote 06/07/2023 at 20:17 • point

add solar panel, and meybe real forever https://www.youtube.com/watch?v=KOZY5DXpZpY system . moving=electricity power

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CustomElectronics wrote 06/07/2023 at 20:27 • point

Great Idea! I actually did that with a version of this circuit a year or so ago. That circuit used a solar cell from a calculator to charge supercapacitors during the day. It would last about 3 days after being charged in direct sunlight for ~30 minutes. Unfortunately I was never able to make the circuit operate by just using the solar panels to power the circuit directly using indoors ambient light, so I'll definitely be trying that next!

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CustomElectronics wrote 06/07/2023 at 20:14 • point

Currently working on increasing the brightness of each flash of the LED without significantly increasing average current draw

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