Internal Oscillator occasionally stops clocking

John Bond

Hi Guys

I've built a couple of Jon's digital candles but using the SX28, larger caps and 4 penlights (2 diodes to drop the voltage). I cast 5 LEDs in a clear resin "flame". I have made a couple and·put them in a hurricane lamp and several imitation candles and they're very realistic. They’re awesome...
·
Trouble is the internal oscillator occasionally seems to hang or stop (just as you power up). You turn the lamp/candle off and on again and it works fine.
·
I’ve tied pins 1,2 & 28 to 5V, I use ports B0..B4 and I use the internal pull-ups on the rest of the I/O pins. OSC1 and OSC2 are not connected.
·
What am I missing?

Kind Regards from Kwa Dukuza


John Bond

Bongo

Have had this trouble in cold conditions.· Never any problem using an external xtal.· Think you will find external xtal or osc pack will be more reliable period.



bongo

Bean

John,
· Try using BOR42 on the DEVICE line.
· Any chance of posting a picture ? I'd love to see it.
Bean.

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Post Edited (Bean (Hitt Consulting)) : 3/14/2006 1:07:18 PM GMT

John Bond

Thanks for that advice·Bean.

I'll try that tonight and I'll post some photos in the morning

Kind regards from Kwa Dukuza

John Bond

John Bond

Hi Bean

Your fix seems to work. I've posted some photos on the Projects Forum

Thanks again

John Bond