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blueroomelectronics · 18th January 2008, 07:50 AM

Nope solid as a rock and well within spec. I sample during sleep, run at 32KHz and use an LCD display. The power supply is remote or 3xAA
I've hooked the LM35 directly to RA0 and no cap.
Not in the photo I've got an HS1101 humidity sensor too and still rock solid.
Your LED display will add about 2C if the sensor is close. Also keep it vertical and the sensor on the bottom. (heat rises)

Suraj143 · 18th January 2008, 07:57 AM

Oh I see did you use any interrupts? I mean AD interrupts.I haven't try interrupts yet.

blueroomelectronics · 18th January 2008, 08:24 AM

Yes one to wake up the PIC. Timer1 overflows every 2 seconds, increments the RTCC, samples the A/D, toggles the TLC555 (humidity) or read the humidity counter. The next version will have RS485 communications.

Interrupts won't fix the error with thermal heat your design has, try turning off the display with a pushbutton, lower your PICs speed, move the LM35 off the PCB.

Suraj143 · 18th January 2008, 08:31 AM

Quote:

Originally Posted by blueroomelectronics

try turning off the display with a pushbutton

You mean to switch off the display then what I can see from my Display?

Quote:

lower your PICs speed

This is one of my concern.I was thinking that.I'll try to do that.

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18th January 2008, 07:50 AM	(permalink)
blueroomelectronics	Nope solid as a rock and well within spec. I sample during sleep, run at 32KHz and use an LCD display. The power supply is remote or 3xAA I've hooked the LM35 directly to RA0 and no cap. Not in the photo I've got an HS1101 humidity sensor too and still rock solid. Your LED display will add about 2C if the sensor is close. Also keep it vertical and the sensor on the bottom. (heat rises) __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com

18th January 2008, 07:57 AM	(permalink)
Suraj143	Oh I see did you use any interrupts? I mean AD interrupts.I haven't try interrupts yet.

18th January 2008, 08:24 AM	(permalink)
blueroomelectronics	Yes one to wake up the PIC. Timer1 overflows every 2 seconds, increments the RTCC, samples the A/D, toggles the TLC555 (humidity) or read the humidity counter. The next version will have RS485 communications. Interrupts won't fix the error with thermal heat your design has, try turning off the display with a pushbutton, lower your PICs speed, move the LM35 off the PCB. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com