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Groups > comp.arch.embedded > #14016

Re: Sensor wiring

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On 9/30/2013 2:05 PM, Stephen Pelc wrote:
> We have done this in a very noisy environment. You *need* to use
> buffer chips like the NXP P82B96. See:
>    http://ics.nxp.com/products/i2chubs/

Interesting part.

Lets do a little math and see if its worth it:

http://www.digikey.com/product-detail/en/PCA9600DP,118/568-4716-1-ND/2025007

$3.69 each for two chips = $7.38

http://www.digikey.com/product-detail/en/SP485CN-L%2FTR/1016-1825-1-ND/3586542

$1.09 each for two chips = $2.18

Difference =               $5.20

Does this project have the budget for an extra $5.20[*]?


Tiny85:

http://www.digikey.com/product-detail/en/ATTINY85-20PU/ATTINY85-20PU-ND/735469

$1.29 each


Tiny84:

http://www.digikey.com/product-detail/en/ATTINY84A-PU/ATTINY84A-PU-ND/2774082

$1.38 each

That adds another $0.09 to the project.

So for $5.29 increase in cost you can do what you want reliably,
or cheaper and still be reliable.


You did not mention what was on the receiving end for this data.
If the remote end only sends data, then only one pin would be required. 
[TxD, the RS485 chip can be enabled all the time]

hamilton

[*]  plus shipping if you do not already have these chips on hand

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Thread

Sensor wiring Mel Wilson <mwilson@the-wire.com> - 2013-09-30 13:16 -0400
  Re: Sensor wiring Tim Wescott <tim@seemywebsite.really> - 2013-09-30 12:39 -0500
    Re: Sensor wiring Jim Stewart <jstewart@jkmicro.com> - 2013-09-30 11:05 -0700
    Re: Sensor wiring Mel Wilson <mwilson@the-wire.com> - 2013-09-30 14:25 -0400
      Re: Sensor wiring Rob Gaddi <rgaddi@technologyhighland.invalid> - 2013-09-30 11:40 -0700
        Re: Sensor wiring Tim Wescott <tim@seemywebsite.really> - 2013-09-30 14:17 -0500
      Re: Sensor wiring Johann Klammer <klammerj@NOSPAM.a1.net> - 2013-09-30 22:30 +0200
    Re: Sensor wiring Les Cargill <lcargill99@comcast.com> - 2013-09-30 21:55 -0500
  Re: Sensor wiring Don Y <this@isnotme.com> - 2013-09-30 11:58 -0700
  Re: Sensor wiring stephenXXX@mpeforth.com (Stephen Pelc) - 2013-09-30 20:05 +0000
    Re: Sensor wiring hamilton <hamilton@nothere.com> - 2013-09-30 15:22 -0600
      Re: Sensor wiring hamilton <hamilton@nothere.com> - 2013-09-30 15:23 -0600
    Re: Sensor wiring Dave Nadler <drn@nadler.com> - 2013-10-01 13:36 -0700
    Re: Sensor wiring Dave Nadler <drn@nadler.com> - 2013-10-01 13:39 -0700
  Re: Sensor wiring Vladimir Vassilevsky <nospam@nowhere.com> - 2013-09-30 16:58 -0500
    Re: Sensor wiring Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2013-10-01 08:44 +0200
  Re: Sensor wiring upsidedown@downunder.com - 2013-10-01 10:02 +0300
    Re: Sensor wiring Tom Gardner <spamjunk@blueyonder.co.uk> - 2013-10-01 09:11 +0100
  Re: Sensor wiring Paul Rubin <no.email@nospam.invalid> - 2013-10-01 00:36 -0700
  Re: Sensor wiring Paul E Bennett <Paul_E.Bennett@topmail.co.uk> - 2013-10-01 09:19 +0100

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