PWM Output Voltage too low

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bllederking
MS/Extra Newbie
Posts: 1
Joined: Tue Mar 17, 2015 7:20 am

PWM Output Voltage too low

Post by bllederking »

Hey guys,

I need your help pls, on my megasquirt 3 the ouptut voltage on every single PWM output chanel is only 0-1.5V.
What I need is 0-5V. Is there an option in the megasquirt software to turn the PWM-output voltage from 0-5V?
Thank you very much!
billr
Super MS/Extra'er
Posts: 6828
Joined: Sun May 15, 2011 11:41 am
Location: Walnut Creek, Calif. USA

Re: PWM Output Voltage too low

Post by billr »

Nobody else is biting on this, so I will try to get it moving. I haven't used PWM (with the MS system), but this statement doesn't look right to me:

" on my megasquirt 3 the ouptut voltage on every single PWM output chanel is only 0-1.5V."

I'm pretty sure PWM of voltages sources up to battery voltage (12-15V) are available from MS, dependent more on wiring than software settings. Tell more about what you are trying to do, what outputs (names, pins) wanting to use, what devices wanting to drive. I think this is a wiring issue, not programming.
Matt Cramer
Super MS/Extra'er
Posts: 17499
Joined: Thu Apr 16, 2009 8:08 pm

Re: PWM Output Voltage too low

Post by Matt Cramer »

PWM outputs are ground switched; you need to add a pull up resistor.
Matt Cramer -1966 Dodge Dart slant six running on MS3X
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