ok i just finished the h4in build with 2.0 beta firmware. everything seems ok but cant get any rpm readings when i start plugging in the constants for the ignition with the jimstim on. how do i set it up to read everything the right way? i want to make sure that my second vr circuit is working and also everything else before i put it in the car.

 

also i put the .1uF cap in between the 5v source and pin 8 for tach noise on the lm1815. is that ok or should i move it?

 

https://www.rx7club.com/megasquirt-forum-153/jimstim-settings-698121/

Post #6

 

ok i dont have d3 there on the jimstim i have dip switch 5 on and primary tach jumpered and it still wont show anything. any other suggestions? please bare with me and be patient im learning as i go. i really do appreciate the help you guys have given me

 

You need a .1uf capacitor in series with the second trigger.

 

If you're hooking up to the jimstim, the second trigger must be connected directly to the processor input for 2nd trigger instead of going through the lm1815.

gross polluter: it's a .01uF cap across the G+ and G- connections to the lm1815 circuit. Not in series.

Ken

 

-so the way i described previosly is not the right way?

-ok would it be safe to place the cap before vr2in?

-and also when setting the tach ignition settings should i set it normally for the rx7 or should i use edis when using the jimstim? when i use the toothed wheel setting it wont give rpm. im a little confused on the setup and not sure at which point im doing something wrong

 

on the Jimstim, you should set it for NipponDenso 24/2

On the MS, you should set it up for 24 tooth cam speed with one second trigger per crank rev, and assuming a stock CAS stab, tooth #1 is at 5 deg BTDC.

If you're trying to use that setup and get a signal from the Jimstim, you'll have to hook the jimstim's 2nd trigger output directly to the MS's 2nd trigger input, and disconnect the lm1815 from the second trigger input temporarily. When you're satisfied that it works, you can reconnect the lm1815 to the 2nd trigger input on the MS chip, and give it a shot in the car with the CAS.

Ken

 

ok will try that as i can get the ms out of its freeze. it seems to freeze when i turn power off and then come back on after like 5 min.

 

also whats my confirmation that its working the way it should? im not sure what to look for.

 

ok i think i figured out the problem. i think i should be getting 5v on pin 7 on the lm1815 and im not. question is should i be getting 5v from pin 7 or not?

 

sorry i know i ask stupid questions sometimes but im just a little confused with the settings. i just wanna make sure im doin it right before i wire it into the car. it says in h4in's write up to put the cap. on the second circuit but wasnt sure where to put it exactly. sorry man im new to this but i do thank you for your patience and all your help.

 

hey guys i didnt mean for it to get out of hand. believe me i get impatient with myself sometimes lol. you guys are much appreciated for the knowledge you share on your free time.
and ken youve helped me before i know the hard work and effort you put in for megasquirt. wish i knew what you guys know so i could help you guys help others.

another ? on the jimstim is the flashing FIidle led on the jimstim letting me know the vr2 circuit is working?

 

it flashes when i turn the rpm pots

 

hrmm, can you post your msq? I'll take a look later this evening.

That LED might be flashing b/c the MS is gaining then losing sync. Did you set up the stim and MS the way I said?

 

yea i think so. i followed everything exactly the way h4in wrote in his guide as far as the build for the 2.0 firmware. my vr2out goes to js10. now i cant get signal with the ignition settings for the rotary cas (toothed wheel)on the ms and the jimstim dip switch 5 on. but when i switch it back to edis on the ms it works and when i jumper the 2nd trigger tach on the stim to pin 31(G+) the FIidle led flashes when turning the rpm pots.

 

OK, well if you go ahead and post your msq, I'll see if it works with my bench setup.

Ken

 

here you go ken

 

Alright, I'll have to try that this weekend and let you know what I find.

Ken

 

here ken try this msq i updated the constants. let me know if it is set up right. i appreciate it ken