A/D converters

StampNut2

Hello, Please can you advise if I can use these A/D converter chips to interface to any of the sharp Ir sensors GD2P12 - 120 range and also the Parallax PIR sensor. As I will be using up to 8 sensors I would like to know which will be best suited for the job. I realize that MAX1270 12-bit A\D has 8 inputs but it may not be the best chip to use.

www.parallax.com/detail.asp?product_id=604-00027
www.parallax.com/detail.asp?product_id=604-00026
www.parallax.com/detail.asp?product_id=604-00001
www.parallax.com/detail.asp?product_id=ADC0831


Thanks

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LilDi

How about this

Post Edited (LILDI) : 8/23/2007 6:06:36 AM GMT

StampNut2

Thanks LILDI, If I wanted to use this to control two servo motors depending on which sensor was activated could I do so?.

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Capt. Quirk

I like using 8 bit ADC's for hobby servos (I know that may not apply to you). I think it's easier to control my seros when I have less increments.

My 12 bit ADC's had problems with holding an exact number and that number would float up and down. So I had to use wider range of results from the ADC, before I would make a single increment change to my servos. When I do use 12 bit adc's, I trim them down to at least 10 bits.

StampNut2

Thanks for all your suggestions, Please keep them coming.

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StampNut2

Any more takers on this question please.

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Tracy Allen

Another ADC that is documented for use with the Stamp is the TLC2543. It is a fast 12 bit converter with a SHIFTOUT/SHIFTIN interface and 11 input channels, available in several different packages including 20 pin DIP.

www.emesystems.com/OL2tlc2543.htm

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Tracy Allen
www.emesystems.com

StampNut2

Great, Thanks Tracy Allen. Keep them coming. What are your thoughts on the TLC2543 using it for eight GD2P12 or other range of sharp IR sensors?. I like the look of this A/D converter and it's features.

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Never give up when things go wrong.

Post Edited (StampNut2) : 8/27/2007 7:22:58 AM GMT

Tracy Allen

The ADC should work fine. Keep in mind that each GD2P12 draws quite a bit of current when it is taking a reading, so you need a good power supply and filtering and a well placed ground connection. Also, don't ovelap the beams if two are on at once. Really just about any ADC should work.

You can find very specific info about connecting the GP2xxx to the TLC2543 and the Stamp on Jonathan Peakall's page at...

madlabs.info/gp2d12/sharp_gp2d12.shtml

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Tracy Allen
www.emesystems.com

StampNut2

Brilliant Tracy, Thanks for the link.

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Never give up when things go wrong.