[simpits-tech] N1 & N2 Gauges

[raysot at comcast.net]

I have a "Benched" N2 gauge out of a 737 that runs on a single Teensy PWM output. If yours is anything like mine, the PWM signal has to switch polarity (Go Negative) during a full cycle. I simply added a 0.1uFD ceramic cap in series on the PWM output and the Gauge input. 

-Ray 

----- Original Message -----

From: "David C. Allen" <dca911t at gmail.com> 
To: "Simulator Cockpit Builder's List" <simpits-tech at simpits.org> 
Sent: Monday, August 7, 2017 3:16:18 PM 
Subject: Re: [simpits-tech] N1 & N2 Gauges 

Hello Matt 
Wish I could find the overhaul manuals ! ! ! ! 

David 

On Mon, Aug 7, 2017 at 1:53 PM, Matt Bailey < dabigboy at cox.net > wrote: 



It's pretty straightforward. You can do this with just an Arduino and one of the cheapo L298N H-bridge boards on ebay. I did it very crudely and easily, and ended up with poor control below about 30% RPM (on my particular indicator), but totally smooth response above that. Another fellow I know adapted a sine wave approach that used the Arduino's PWM channels, which gave good control all the way down to 0. 

Check out the overhaul manual for your indicators. You're basically building a brushless speed controller. 

Matt 






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