Stand Alone Stamp

Archiver

Hello Stamp Freaks

Sorry for my bad English, but I live in the Dutch speaking part of Belgium
;-)

I'm going to use a BS2 in a stand alone automotive project for driving
linear motors. (opening and closing the waste tanks of my motorhome)

Because I don't need to program the stamp "in the field", pins 1,2,3 and 4
(TX, RX, ATN, SGND) are unused.

When using a stamp in the interfering, noisy environment of a car I think I
should take some precautions, what do I do with the unconnected
communication pins, connect them via a pull up to vcc, to the ground or do I
leave them unconnected?

What is a good filtering circuit for the 12 v battery supply, just a 100 nF
cap near to the power pins of the stamp or isn't it sufficient enough.


Thanks in advance

Michel De Meester

michel.de.meester@u...

Met vriendelijke groetjes,

> ************************************************
> Michel De Meester
> Biotechnisch Onderhoud
> Universitair Ziekenhuis Antwerpen
> Wilrijkstraat 10
> 2650 Edegem - B
> tel: 03/821.3647
> e-mail: michel.de.meester@u...
>
> *************************************************
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>

Archiver

>Because I don't need to program the stamp "in the field", pins 1,2,3 and 4
>(TX, RX, ATN, SGND) are unused.
>
>When using a stamp in the interfering, noisy environment of a car I think I
>should take some precautions, what do I do with the unconnected
>communication pins, connect them via a pull up to vcc, to the ground or do I
>leave them unconnected?


Connect ATN and SGND to ground. Noise on the ATN pin can reset the Stamp.