Problem using output3 as an output

All Megasquirt 1 support questions. See also the Documentation

Moderators: jsmcortina, muythaibxr

Post Reply
jassem99
Helpful MS/Extra'er
Posts: 93
Joined: Sun May 09, 2004 11:46 am
Location: Leeds, UK
Contact:

Problem using output3 as an output

Post by jassem99 »

Dear all,

I was hoping to use output3 to trigger a water mist setup on avehicle using MAT and TPS as inputs. On the stimulator, that part works (i.e. using source of output3 = output1+source does indeed combine MAT and TPS inputs). The problem is that the output from output3 (pin 15 of U1 after removing R1) is not an on-off output, but rather PWM-ish. The green 'LED' on megatune flickers randomly, and I confirmed this PWM-ish output with my scope.

Another problem is that the delay function of output3 doesn't seem to make any difference, and I was really hoping to use that feature.

Code is 029q2, PCB is v3. Anyone have any output3 experiences? Output1 and output2 work just fine as on-off switches, but they won't do delay or dual inputs like output3 seems to be able to do. Thanks for any suggestions.

Basil
jsmcortina
Site Admin
Posts: 39617
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Post by jsmcortina »

In what way is it working on the stimulator?

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
jassem99
Helpful MS/Extra'er
Posts: 93
Joined: Sun May 09, 2004 11:46 am
Location: Leeds, UK
Contact:

Post by jassem99 »

jsmcortina wrote:In what way is it working on the stimulator?

James
On the stimulator it gives a short pulse of voltage every few milliseconds. very much like the output on the FIdle pin.

Very off topic, but another problem i found today was that the overboost function does not work as i expected. The car kept boosting past 160kpa even when i had the hard cut limit set to 110kpa.

Basil
Karl
Helpful MS/Extra'er
Posts: 59
Joined: Wed Jun 21, 2006 11:57 am

overboost

Post by Karl »

If youre flowing more exhaust than your waste gate can handle, then you will get overboost, even with MS working right.
jsmcortina
Site Admin
Posts: 39617
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK
Contact:

Post by jsmcortina »

Please post your MSQ

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
Post Reply