In SX Microcontrollers, SX/B Compiler and SX-Key Tool, John Bond wrote:

Hi Guys
 

I've built some of Jon's LED candles (using the SX28 IC). The 5 LEDs in the "Flame" are randomly pulsed on and off and large electrolytic caps soften the switch on so that the LEDs don't have a digital look. Each LED goes from dim to bright in each cycle rater than switching ON/OFF.  Looks great!

 

Just one problem, each candle consume 80mA which gives the 4 penlight AA a life of under 24 hrs. I'm told I could pulse the LEDs with a duty cycle of say 5% and get the consumption down to under 5mA or a battery life of about a week.

 

The question is how to I change the intensity of the LED and pulse it at the same time?

 

Kind Regards from Kwa Dukuza

 

John Bond

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