What is it?
Simple PCB board (or optionally Kit) to fade LEDs using fairly lower power. I designed this circuit to be embedded into a prop, like a Halloween pumpkin or spooky rat. Can easily run for …
Simple PCB board (or optionally Kit) to fade LEDs using fairly lower power. I designed this circuit to be embedded into a prop, like a Halloween pumpkin or spooky rat. Can easily run for months on a single 18650 cell.
Why did you make it?
Using a microcontroller, like an Arduino, to fade an LED is not always the best option. Sometimes, you want a simple, low powered circuit that can be embedded directly into a prop while running from a battery for weeks at a time.
After testing about a dozen prototypes, I developed this circuit that works extremely well and is simple to implement, tweak, and embed inside of almost anything. This circuit will run on as little as 3.5 volts making it ideal for a lithium-ion battery, 5V USB, a button cell, or a small AA battery pack.
What makes it special?
Using all standard components that you probably already have in your parts bin. Very easy to build project.
Key components needed (ONLY included if you buy the Complete Kit):
555 Timer
NPN Transistor (2N2222 or similar)
1N4007 Diode (or similar)
1000-1200uF Capacitor
Various Resistors & Capacitors
You can use a micro-usb (optional) or a screw terminal to power the circuit. Because it is lower power and can be run from a variety of voltages, you can use anything that fits your project design.
If that micro-usb makes you nervous, just send me a note and I'll solder it on for you
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