Need a small solution for a pulsing LED

[havanother]

Hi, we're looking for LEDs that pulse rather than flash - similar to the power lights on Apple Mac computers. Rather than just flick on then off, they ramp slowly up to full brightness then down again, cycling every 1 to 1.5 seconds.

We have 2 circuit diagrams made up as prototypes but both are far too large for our purposes. We were hoping that someone might manufacture a 'built in' version similar to the readily available built in flashing models.

If nobody can suggest someone that may be able to produce an 'all in one' unit, perhaps you could suggest another way of creating a solution that's as small as possible?

Could we have a chip programmed or manufactured or is there another way to do it that minimises size?

I'm not even sure this is the place to ask! But any advice would be greatly appreciated.

Thanks in advance,

Havanother

 

[scorpionss22]

u can use 555 astabler and in the out put u must
put resistor and capacitors for makinf light rample slowly

 

[silvio]

Hi havanother,

I don't know if it's a LED manufacturer on the market that it's doing all in the same unit.

If don't, the best solution is to use the PWM , Pulse Width Modulation.

The low-end 8-bit Motorola MC68HC908-QT2 flash MCU with built-in oscillator is used **broken link removed**

one from 8051 series https://www.iguanalabs.com/pwm.htm

BTW, what's your favorite microcontroller ?

 

[IanP]

You can program all functions into a small 8-pin PIC-based microcontroller:
https://ww1.microchip.com/downloads/en/DeviceDoc/41152b.pdf

 

[havanother]

Hi,

Thanks for your advice. We may end up creating a circuit as you described but right now we're following up some leads we have from manufacturers who may be able to provide an all-in-one unit - similar to the readily availble flashing LEDs. Depending on the quantities involved we may even be able to specify the pulse length. Fingers crossed. If it doesn't work out, we'll be back to a bespoke solution using a chip.

cheers, havanother.

 

[netsearcher]

use TinyAVR Micorcontroller
you can program it for doing everything you want only in a 8 pin package.
so search in Google for TinyAVR microcontrollers

 

[shmoib]

try to obtain a traingular waveform or saw tooth by integrating a square wave which u may get from 555 chip or either a crystal oscillator followed by an inverter.

u can use this programs to get the frequancy and R and c values u need from 555

 

[Badaruddin]

It is easy to make it by using microcontroller. Make a PWM program, and increase the duty cycle little by little.