Comparator - Electronic Circuits Projects Diagrams Free

AtomSoft · 26th June 2009, 02:22 PM

Ok i have heard the way to read those mTouch sensors is by using the comparator on a PIC or w/e. I have seen some code and such but i have no clue as to what exactly does the comparator do.

Can one use a Comparator IC like LM339 to accomplish the same thing?
LM339 - Low Power Low Offset Voltage Quad Comparator

Or is it not possible because the values are changing and one must keep a reference value first?

I have no clue how this works. I would love to make a touch sensor. I have seen it done on bare PCB with some minor etching. Basically the outside is ground and the inside is the tap. And you read it using the comparator of a pic.

Anyone got info? Links? anything besides microchips ANxxxx stuff lol

ericgibbs · 26th June 2009, 02:28 PM

hi atom,
The CMOS range of digital ic's will give a easier/better 'touch' operation than LM's.

eg: HEF40106, HEF4093 [schmitt types]

http://www.paia.com/ProdArticles/touchsw.html

EDIT:
http://www.electronics-project-desig...-Circuits.html

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26th June 2009, 02:22 PM	#1
AtomSoft	Comparator Ok i have heard the way to read those mTouch sensors is by using the comparator on a PIC or w/e. I have seen some code and such but i have no clue as to what exactly does the comparator do. Can one use a Comparator IC like LM339 to accomplish the same thing? LM339 - Low Power Low Offset Voltage Quad Comparator Or is it not possible because the values are changing and one must keep a reference value first? I have no clue how this works. I would love to make a touch sensor. I have seen it done on bare PCB with some minor etching. Basically the outside is ground and the inside is the tap. And you read it using the comparator of a pic. Anyone got info? Links? anything besides microchips ANxxxx stuff lol __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

26th June 2009, 02:28 PM	#2
ericgibbs	hi atom, The CMOS range of digital ic's will give a easier/better 'touch' operation than LM's. eg: HEF40106, HEF4093 [schmitt types] http://www.paia.com/ProdArticles/touchsw.html EDIT: http://www.electronics-project-desig...-Circuits.html __________________ Eric " Good enough is Perfect " I will NOT answer PM's requesting technical help, please use the Forum PIC tutorials: Nigel's www.winpicprog.co.uk/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 26th June 2009 at 02:32 PM.