Re: [Gumstix-users] 32 relays and 16 ADCs with Gumstix.

[Bill G. <bg...@bi...>]

That's why I shouldn't post from my Treo in the mechanic's office...  Too many part numbers!  ;)

-----Original Message-----
From: "Jon Hylands" <jo...@hu...>
To: "General mailing list for gumstix users." <gum...@li...>
Sent: 12/4/08 7:44 AM
Subject: Re: [Gumstix-users] 32 relays and 16 ADCs with Gumstix.

On Thu, 4 Dec 2008 07:22:54 -0600, Bill Gatliff <bg...@bi...>
wrote:

> At that point, might he be better to spin a small board featuring, for example, an ATMEGA168 talking to  the Gumstix over i2c?  Or, perhaps, just an i2c gpio expander?  

Well, the thing is, if he has to control 32 relays (digital I/O), and 16
analog inputs, he needs a micro-controller that (a) has 16 A/D ports, and
(b) has at least 48 I/O pins overall.

An ATmega168 only has 8 A/D ports (only 6 in the DIP form), and only 15
other digital I/O ports (assuming you use 2 for comms). 

That's why I recommended the Axon - its an ATmega640, and has all the I/O
he would need to do this. Of course, he could spin a board with a bare
ATmega640 on it, and all the relays and MOSFETs he needs as another option.

Later,
Jon

--------------------------------------------------------------
   Jon Hylands      Jo...@hu...      http://www.huv.com/jon

  Project: Micro Raptor (Small Biped Velociraptor Robot)
           http://www.huv.com/blog

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