MpGuino compatibilty issues

[dcb]

I appreciate your perseverance. Can you try the separate battery trick thusly:

Connect spare battery ground to vehicle ground.

Connect spare battery + and ground to the guino 12v input.

connect vss and inj as normal.

See if that helps at all.



Also Did you change vssdelay to 3 to fix something?

FYI, The high cpu numbers are only when you use setup. It clears back to normal at next power cycle.

[bbjsw10]

Set vss to 3 to see if would smooth mph reading, will set back to 2.

[bbjsw10]

I was sitting here thinking, would putting a little larger cap on output of 7805 help smooth out the 5v signal? I took it for a drive and a lot better now. Did not do the spare battery separation. I just think maybe replace the .1 uf with something a tiny bit larger.

I cleared the eprom and reloaded everything, instead of just code. It helped it out some.

[bbjsw10]

Alright it is fixed!! Thanks for the help.

After resetting everything including eprom, it has went several eoc cycles and no reset. I still think it was voltage spikes causing this to happen, the added bonus of backup battery is I can disconnect main battery to work on car and not lose any memory on guino.

Now to fill tank so I can start with fuel pulses. I wonder what people will think when I only stop for like a 20 second fill up.

[dcb]

sweet! Thanks BB I'll have to think about some more capacitance and another diode or two before putting in the pcb order.

[bbjsw10]

Yeah, would be a good idea. Some people would not like to troubleshoot as much as I do at times.

Edit: Will this pcb you are talking about be for iduino? or a stand alone unit on its own? USB capable?

[bbjsw10]

Well it locked again.

Could it be a heat issue it was warmer today than yesterday, when it locked 7805 was pretty hot to the touch. Not enough to burn ya but a lil uncomfortable.

I remember seeing someone had a problem with transistor/ dimmer circuit. What were those symptoms?

Good news though 8479 is exact on vss.

[GeoGreg]

Hey how would you hook up the iduino mpguino straight to the battery? I was just wondering do you just attach a cable from the positive end of the battery to the 12v on the mpguino and then the negative to the ground or how would you do it?

[ptsmith24]

Originally Posted by GeoGreg

Hey how would you hook up the iduino mpguino straight to the battery? I was just wondering do you just attach a cable from the positive end of the battery to the 12v on the mpguino and then the negative to the ground or how would you do it?

I used ECU battery and ECU ground. Check your pinouts to see if that's feasible. Keep in mind you must use constant power (that doesn't die when you key off). That way it can keep your tank data. You can also find a wiring diagram for your radio. Radios generally have a constant-on power lead in order to keep station presets, etc. Hope that helps.

[GeoGreg]

I have a 1993 geo metro. If I hook up my stereo and the mpg to the same wire that is supposed to be for the stereo 12v constant would that cause any issues? Thanks for helping.