I just bought an egt module and probe from www.thesensorconnection.com. I know that the MS. accepts a 0-5v signal to represent egt. My module has a 0-5v output which i wanted to use for MS. I figured that I would not have to build the circuit if I fed MS the 0-5v signal. How will I go about this? Also my module reads 0-1300c(0v=0c, 5v=1300c). How do I configure MS to read it the same? Im hoping this will work. I searched and did not find anything on this topic. Thanks.

Thank You,
Jose Nieves

 

Please see http://www.msextra.com/ms2extra/MS2-...g.htm#addgauge . This describes what needs to be done.

-Mike

 

by the way im running ms1, v3.o board

 

Look around on msefi.com and msextra.com - you'll fiond what you need.

-Mike

 

As for me, I understand this much from this schematic: http://www.msextra.com/manuals/MS_Ex...l.htm#addgauge
Parts needed:
5.1V Zener diode
0.22uf cap. (220nf cap) Ceramic
1M resistor
1k resistor

Now, what wattage resistors? 1/8, 1/4, 1/2 ?
As for the cap., 50V, 100V?

Lastly but most importantly, what about the Zener diode?
http://search.digikey.com/scripts/Dk...0diode&stock=1
I know that voltage breakdown is 5.1V and voltage reverse standoff is 5V, but what about power (watts)? What series--CE, CPDU, CPDER, CPDFR, etc.??
Or, do I find it from this list? http://search.digikey.com/scripts/Dk...0diode&stock=1

I'm just trying to help him out and I'm a bit lost myself. (btw, I searched for a long time on msefi.com and msextra.com)

Brian

 

I hear you regarding the "lots of searching" experience - there's a ton of stuff there and I'm not sure how it could be more easily indexed. That circuit is very low power, 1/8 or 1/4 should work just fine. It's purpose in life is to protect the processor pin and to contribute to a nice clean signal. The Zener will only ever conduct if the voltage exceeds 5 volts so pretty much does absolutely nothing in the case of a properly connected, properly operating TC amp in a system without ground loops, no alternator dumps, etc. The others are for overcurrent protection and signal smoothing. It's overkill for many situations but 50 cents of simple parts is cheap insurance against a smoked ECU.

-Mike

 

I really appreciate that and your response helps him (and me) out alot
But as for the list of all the different types of zener diodes on digikey, I'm seriously lost as to what to narrow it down to. 1 list has 30 types (of 5.1v diodes) and the other list has 295 (of 5.1V diodes.....I honestly don't know what kind to look for.
Thanks

 

No worries, thanks for the thanks... http://search.digikey.com/scripts/Dk...=1N5338BGOS-ND should fill the bill.

-Mike

 

Thanks Mike, you def pointed us in the right direction and its very much appreciated. This is the diagram we were looking at http://www.msextra.com/manuals/MS_Ex...Manual.htm#egt. It got brian and I very confused as to how to get the 0v-5v signal in without the mess.

Thank You,
Jose Nieves

 

OK, I see the point of confusion. Jose, the link you referred to is the schematic for the AD595 TC amp and associated components. You don't need this, your first message indicates you have a 0-5v output TC module from thesensorconnection.com. The circuit I linked to is a generic conditioning circuit used for reasons I previously posted. Strictly speaking, things would work OK by just running your signal to the processor pin - but - if the processor's input pins see anything other than 0-5v, the internal ADC (analog-digital converter) in the chip will fry, instantly. It doesn't take much, you can kill them with minute amounts of static electricity in your body just by handling the unprotected chip. You'll be well served by not directly connecting unprotected wiring (aka, an antenna!) to processor pins. That ticking sound you may heard on an AM radio from the ignition? That induced voltage from the ignition can be one source of overvoltage transients which are deadly to some semiconductors. If you get a chance, put an oscope on your car's +12 - it's very scary how dirty the "DC" is. Just verifying, is http://thesensorconnection.com/egt_p..._egt_meter.htm the device you're using?

-Mike

 

For future reference for anyone doing this and stumbles across this thread, the digikey part numbers are:
1.0MQBK-ND
1.0KQBK-ND
399-4407-ND
1N5338BGOS-ND
Only 1 of each is needed.
This is the device that is creating the output signal:
http://thesensorconnection.com/egt_p..._egt_meter.htm

Thanks again Mike

 

No worries, stay warm!