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Date:         Wed, 13 Nov 2013 07:30:35 -0800
Reply-To:     Brett Ne <brettn777@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Brett Ne <brettn777@GMAIL.COM>
Subject:      Re: Arduino and Vanagons
In-Reply-To:  <52838A16.6080400@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

I have done quite a bit of programming with Arduinos over the past several years and would like to tackle this challenge. I've got an 82 Riviera with an 89 VW Fox engine the has two Arduinos that monitor and display temperatures(inside, outside, fridge interior, fridge cold coils, fridge hot coils) and voltages (main & auxiliary). Propane fridges become a whole lot nicer to use when you can tell exactly what's going on inside at all times.

My current hamster wheel is old school CIS, so it has no idle stabilizer. I would need someone knowledgeable to detail all the input and output voltages and behaviors. I would especially need some input from someone who's used a scope on the primary side of their coil: what's the duty cycle? how high are the voltage spikes? are there any negative voltage spikes? Microcontrollers do not like going above 5 volts, and a highly inductive device like an ignition coil is very hazardous to them if the signal is not properly conditioned.

Brett in Portland

"Albert", 82 Riviera


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