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Old 05-04-2012, 04:40 AM   #371 (permalink)
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thanx jellybean I assembled & checked (without vehicle) on my desk & things were working showing km/l do i still need to change the crystal? I already installed .86 version
on starting it shows MPGUINO v 0.86 now I will check on my car shoul I change the crystal or check with 16 mhz one?
thanx

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Old 05-04-2012, 05:04 AM   #372 (permalink)
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how to change crystal? simple desoldering & soldering or any change after crystal change?
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Old 05-04-2012, 06:45 AM   #373 (permalink)
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You dont have to change crystal, change code.
http://opengauge.googlecode.com/svn/...no/mpguino.cpp
cpp file has section where you comment 20mhz part out and 16mhz part in. Only few lines needs changing.

change this part...
Quote:
//use with 20mhz
#define cyclesperhour 4500
#define dispadj 800
#define dispadj2 1250
#define looptime 1250000ul/loopsPerSecond //1/2 second
#define myubbr (20000000/16/9600-1)
#define injhold (parms[injectorSettleTimeIdx]*5)/4

#define outhi(port,pin) PORT##port |= ( 1 << P##port##pin )
#define outlo(port,pin) PORT##port &= ~( 1 << P##port##pin )
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))

//use with 16mhz, not tested
//#define cyclesperhour 3600
//#define dispadj 1000
//#define dispadj2 1250
//#define looptime 1000000ul/loopsPerSecond //1/2 second
//#define myubbr (16000000/16/9600-1)
//#define injhold parms[injectorSettleTimeIdx]
...to this:
Quote:
//use with 20mhz
//#define cyclesperhour 4500
//#define dispadj 800
//#define dispadj2 1250
//#define looptime 1250000ul/loopsPerSecond //1/2 second
//#define myubbr (20000000/16/9600-1)
//#define injhold (parms[injectorSettleTimeIdx]*5)/4

#define outhi(port,pin) PORT##port |= ( 1 << P##port##pin )
#define outlo(port,pin) PORT##port &= ~( 1 << P##port##pin )
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))

//use with 16mhz, not tested
#define cyclesperhour 3600
#define dispadj 1000
#define dispadj2 1250
#define looptime 1000000ul/loopsPerSecond //1/2 second
#define myubbr (16000000/16/9600-1)
#define injhold parms[injectorSettleTimeIdx]

Other option is, that you use older version - it is arduino compatible withiout changes:
http://opengauge.googlecode.com/svn/...no/mpguino.pde

Meelis

Last edited by meelis11; 05-04-2012 at 06:53 AM.. Reason: typos fixed, code part pasted in
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Old 05-04-2012, 11:54 AM   #374 (permalink)
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MPGuino received. Thanks JellyBeanDriver! It looks clean. Can't wait to get it installed. Its the Apple Blossom festival this weekend so its gonn have to wait until next week. However I think the community here will like my clever mounting idea. Pics to come soon.
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Old 05-04-2012, 07:12 PM   #375 (permalink)
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@meelis11 (and nanhi99), the "dispadj2 1250" is incorrect. For 16mhz, both dispadj and dispadj2 should be 1000.
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Old 05-05-2012, 12:58 AM   #376 (permalink)
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Where can i get mines and how much shipped?
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Old 05-05-2012, 11:58 AM   #377 (permalink)
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Hi I am now trying to built MPguino on seperate pcb please can you tell me as Iam unable to get 330 mfd & 50K can what other resistance & capacitor can be used?
like 47 k instead of 50k & 470 Mfd instead of 330 Mfd
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Old 05-05-2012, 12:43 PM   #378 (permalink)
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Quote:
Originally Posted by nanhi99 View Post
Hi I am now trying to built MPguino on seperate pcb please can you tell me as Iam unable to get 330 mfd & 50K can what other resistance & capacitor can be used?
like 47 k instead of 50k & 470 Mfd instead of 330 Mfd
That would be fine, they're not critical.
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- http://www.dschmidt.com/MPGuinoJBD.html
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Old 05-14-2012, 02:25 AM   #379 (permalink)
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Quote:
Originally Posted by JellyBeanDriver View Post
Ordered one today thanks in advance
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Old 05-15-2012, 12:58 AM   #380 (permalink)
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Quote:
Originally Posted by shockj2000 View Post
Ordered one today thanks in advance
Shipping out tomorrow, thanks!

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1992 Geo Metro, 1.0L 5spd, 435,000 miles on the original engine and trans!
- knuckles/hubs/brakes/13" wheels from a 2000 Metro
- running 175 70R13
- averaging 51.7 MPG, 56.9MPG best tank.
- self built MPGuino
- http://www.dschmidt.com/MPGuinoJBD.html
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