[TriEmbed] Frying Raspberries - TriEmbed Digest, Vol 22, Issue 25

[Robert Gasiorowski]

Why not use port expanders?
MCP23S17/18 for digital I/O and TLC5940 for PWM for example. 

Rob. 


iOS = OS X on Diet Code

> On Mar 30, 2015, at 11:53 PM, Jon Wolfe <jonjwolfe at anibit.com> wrote:
> 
> One of the things I love about AVRs is that they are electronically much tougher than any ARM I've run across.  The only AVR I've ever fried was when I connected its power to wrong side of an lm317 and sent 9 volts into it. Even then, no magic smoke; the code on the chip still functioned, it just lost the ability to be flashed with new code.
> 
> 
> I've never fried an ARM chip, but that's more dumb luck than anything else. It seems that whenever I mess up some wiring, it's a cheap logic or buffer chip that takes one for the team.
> 
> 
> -------- Original message --------
> From: Terry King
> Date:03/30/2015 3:42 PM (GMT-05:00)
> To: triembed at triembed.org
> Cc: drbearee at gmail.com,maryalice at yourduino.com
> Subject: Re: [TriEmbed] Frying Raspberries - TriEmbed Digest, Vol 22, Issue 25
> 
> I think Arduinos are much more resistant to frying.  This may be because their older technology
> has larger features and/or their I/O pins which Atmel assumed would be used for physical computing
> (as compared to the Pi's processor-centric SOC) have bigger reverse diodes.
> 
> So why  not just use Arduino for the physical I/O and link it to a Pi for the Computer/ Operating
> System / Network / Human Interface World part, and accept the fact that they are so different? And
> there are so many good software library / device choices out there.
> 
> DISCLAIMER: About to mention stuff from my own shop...!! Watch out!
> 
> AT $15 for a nice Arduino Derivative that already has 20 I/O pins, 20 ground pins, and 20 Vcc
> pins, plus nice 4-pin I2C and Serial connectors, and a 5V 2A switching supply built in, why not
> solve a bunch of things that are far from the Linux world.  I have sold about 5000 of these 
> (really just selling Atmel 328's and pins) and I think I've got 5 back that were fried "for
> unknown reasons". I do know of several that were fried for Known, Oops type reasons. And I have
> had a bad batch of the earlier versions that had fake USB chips that the manufacturer later
> bricked with a drive update. My board manufacturer replaced them immediately. So we went to the
> UNO type USB and that has been trouble-free.
> See:http://arduino-info.wikispaces.com/YourDuino-RoboRED
> 
> I'm looking for a good small HDMI display that costs less than the Raspberry Pi to run it. Anyone
> seen good possibilities?  A Pi with that,  a cheap Mouse and and Arduino I/O interface would make
> many really nice intelligent, networked devices.
> 
> I've been smelling the solder flux smoke for 64 years now (starting with the 1-tube receiver for
> my Radio Merit Badge) and it's the only kind I like.
> 
> Regards, Terry King
> ...In the Woods in Vermont USA
> terry at terryking.us
> 
> -The One who Dies with the most Parts LOSES. What do you need??
> 
> 
> _______________________________________________
> Triangle, NC Embedded Computing mailing list
> TriEmbed at triembed.org
> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
> TriEmbed web site: http://TriEmbed.org
> _______________________________________________
> Triangle, NC Embedded Computing mailing list
> TriEmbed at triembed.org
> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
> TriEmbed web site: http://TriEmbed.org