Official MPGuino preassembled now available

[nanhi99]

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

[nanhi99]

how to change crystal? simple desoldering & soldering or any change after crystal change?

[meelis11]

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...

//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:

//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

[SiVX]

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.

[nickdigger]

@meelis11 (and nanhi99), the "dispadj2 1250" is incorrect. For 16mhz, both dispadj and dispadj2 should be 1000.

[3gd16]

Where can i get mines and how much shipped?

[nanhi99]

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

[JellyBeanDriver]

Originally Posted by nanhi99

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.

[shockj2000]

Originally Posted by JellyBeanDriver

I'm selling them here:
http://www.dschmidt.com/MPGuinoJBD.html

Ordered one today thanks in advance

[JellyBeanDriver]

Originally Posted by shockj2000

Ordered one today thanks in advance

Shipping out tomorrow, thanks!