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Wiring for the jab 3300

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mosquito56

Joined: 24 Aug 2007
Posts: 77
Location: Laredo, Tx

Posted: Wed Jun 10, 2009 11:05 am Post subject: Wiring for the jab 3300

I am trying to find explanations on the sensors for the 3300. Specifically the electrical characteristics?  



I am trying to wire them up to a microcontroller and some adcs. 



Rpm--- will the hall effect work on 5v dc?

Oil pressure and temp--- are they just like the gas level resistor?



Thanks, 

Don

_________________
Don Merritt- Laredo, Tx
.

matronics(at)rtist.nl
Guest

Posted: Wed Jun 10, 2009 11:50 am Post subject: Wiring for the jab 3300

Many hall sensors can be operated on 5V. Here's an example of a gear-tooth 

hall sensor datasheet: http://www.hallsensors.de/CYGTS101DC.pdf

As you can see, the sensor requires a pull-up resistor (probably open 

collector). Many microcontrollers (eg. Atmel AVR) can be configured to 

activate a suitable internal pull-up.



The pressure and temp sensors are variable resistors. If you add a known 

pull-up to +5V then you should be able to get a level that an embedded ADC 

can process.



Engine environments are truely harsh from an electrical design point of 

view. Make sure you design plenty input protection (big spikes, load dumps, 

overvoltage, reverse connections, short circuits) on your microcontroller, 

or be prepared to see flakey results and blown parts. If at all possible, 

avoid direct connections from the microcontroller to the outside world. Use 

buffers on input and output. And when you start programming, be defensive. 

Check all code paths and all variables for out-of-range values, and provide 

some sort of visual "Lost my mind" indication. A watchdog timer can be 

helpful too..



Rob

---

craig(at)craigandjean.com
Guest

Posted: Wed Jun 10, 2009 12:37 pm Post subject: Wiring for the jab 3300

The RPM Hall effect sensor is not supplied with the engine. Most people with

electronic gauges or EFIS tie into the AC alternator field windings and look

for 6 pulses per revolution (3300).



Oil temp is a NTC resistive device - negative temperature coefficient. As

the temperature goes up the resistance goes down. The pressure sender is a

VDO part where a mechanical slider moves over a resistive element (that is

why they wear out). Look on the VDO site.



-- Craig



--

matronics(at)rtist.nl
Guest

Posted: Wed Jun 10, 2009 1:13 pm Post subject: Wiring for the jab 3300

And to add the caveat here, tying your microcontroller to the AC alternator 

is lethal to the chip without proper precaution. If you really want to do 

that, take a look at the signal with a scope to see what hostile signal 

comes from the alternator.. Set scope for 20V per division...



Rob

---

mosquito56

Joined: 24 Aug 2007
Posts: 77
Location: Laredo, Tx

Posted: Wed Jun 10, 2009 7:50 pm Post subject: Re: Wiring for the jab 3300

Hmm, hall efffect not supplied? What is that a $2 transistor. I saw a pic with the sensor installed on a Jab site. I ass-u-me-d that it was supplied.

  I assume there is a mount for it on the engine?????



 Thanx for all the pullup and protection advice. I will definetely be taking it all to heart. 

 Glad to hear everything is just pots, the oil temp and  pressure. 



 What is a vdo?   



   I hope to open my engine box next week and am beginning to plan for the microcontroller. 

Don

_________________
Don Merritt- Laredo, Tx
.

craig(at)craigandjean.com
Guest

Posted: Wed Jun 10, 2009 8:10 pm Post subject: Wiring for the jab 3300

VDO is the German maker of senders and gauges.



-- Craig



--

Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Thu Jun 11, 2009 12:23 am Post subject: Wiring for the jab 3300

It's an eddy current probe, there is a mount sticking out from the engine back plate, it counts two small tabs that are on the back of the fly wheel.



I got it from RS Components

Products In Stock

-------------------------------------------------------------------------------------------

RS Stock No.    Qty   Unit Price   Goods Value Description                   

-------------------------------------------------------------------------------------------



304-166           1        £8.30         £8.30                               

                                               Magnetic,pick up,min,Analogue,O/P 10V 



Regards, Clive

-----------------------------------------------------------------------------------------------------------------------------------------------------

Hmm, hall efffect not supplied? What is that a $2 transistor. I saw a pic with the sensor installed on a Jab site. I ass-u-me-d that it was supplied.

  I assume there is a mount for it on the engine?????



 Thanx for all the pullup and protection advice. I will definetely be taking it all to heart. 

 Glad to hear everything is just pots, the oil temp and  pressure. 



 What is a vdo?   



   I hope to open my engine box next week and am beginning to plan for the microcontroller. 

Don



--------

Don Merritt- Laredo, Tx

  Apologies if I seem antagonistic.

  I believe in the freeflowing ideas and discussions between individuals for assistance in this thing we call life.





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 47649#247649

mosquito56

Joined: 24 Aug 2007
Posts: 77
Location: Laredo, Tx

Posted: Thu Jun 11, 2009 4:12 pm Post subject: Re: Wiring for the jab 3300

Thanx, that will save me a bunch of grief.

_________________
Don Merritt- Laredo, Tx
.

Don McIntosh

Joined: 02 Jul 2007
Posts: 24
Location: Sandpoint, Idaho

Posted: Fri Jun 12, 2009 7:34 am Post subject: Re: Wiring for the jab 3300

Are you talking about the sensor for RPM here because I was wondering also what to get to feed RPM info to my Dynon? Will this sensor you called out here do this? I am just getting ready to start all the wiring and sensor hookup.

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_________________
Don McIntosh
Kitfox Series 7
Jabiru 3300

DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Fri Jun 12, 2009 8:21 am Post subject: Re: Wiring for the jab 3300

Don,



With the Dynon, you can just tap into one of the alternator output wires.  Set the Dynon configuration to read 6 pulses per rev.  That is what I did and it read within 1 RPM of a PropTach optical unit.



Good luck,

_________________
David Gallagher
Cincinnati, OH area

Don McIntosh

Joined: 02 Jul 2007
Posts: 24
Location: Sandpoint, Idaho

Posted: Fri Jun 12, 2009 8:24 am Post subject: Re: Wiring for the jab 3300

Great!

Thanks,

_________________
Don McIntosh
Kitfox Series 7
Jabiru 3300

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