Comments on: PIC: PC Interfaced Digital Thermometer using PIC Microcontroller

By: Krishan

Krishan — Tue, 09 Nov 2010 16:08:09 +0000

Very useful details.
Thanks

By: creativeelectron

creativeelectron — Tue, 25 May 2010 22:49:23 +0000

Actually for negative temperature LM35 creates negative output voltage. Since PIC's ADC can only read positive voltage that is why it is showing zero value. You can use an op-amp circuit to create offset in the reading if reading negative voltages are required.

By: Shahab Siddiqi

Shahab Siddiqi — Sat, 22 May 2010 17:08:46 +0000

This works great on LCD as well, but only for positive values. I tried simulating this on Proteus and it showed 0 on the LCD when I tried negative temperatures. Am I doing something wrong?

By: shb

shb — Sun, 25 Oct 2009 17:54:10 +0000

Got it..Thanxx..

By: creativeelectron

creativeelectron — Sat, 24 Oct 2009 23:05:58 +0000

Check this http://creativeelectron.net/?p=675

By: creativeelectron

creativeelectron — Sat, 24 Oct 2009 23:05:19 +0000

What do you mean by “then what” and “what about” ? Sorry can't understand you.

By: Shb

Shb — Sat, 24 Oct 2009 16:45:38 +0000

no after connecting them with capacitor then what….What abt that power and gnd which r connected with these two pins…

By: creativeelectron

creativeelectron — Sat, 24 Oct 2009 05:50:10 +0000

no it doesn't mean that. it is just meant to be connected with capacitors.

By: Shb

Shb — Sat, 24 Oct 2009 03:15:38 +0000

hmmmm….
does that mean that Vs+ is to be connected to Vcc ??? and Vs- is to be connected to the common gnd ??? or are these two to be connected to a separate connector for communication purpose????

By: creativeelectron

creativeelectron — Fri, 23 Oct 2009 20:34:01 +0000

MAX232 enhances voltage by charging and connecting capacitors in series.All is done internally by its logic controller and voltage comparator. There polarity for series connection determines the polarity of output voltage that is TX.