Tiny IOx timer circuit VSS VR conditioner

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Tiny IOx timer circuit VSS VR conditioner

Postby 5.3LS10 » Sun Apr 16, 2017 9:53 pm

Hey Everyone,

I currently have a MS3x in my car with the dual VR conditioner taking in front and rear wheel speed sensors for traction control.

I grabbed the tiny IOx because I need more inputs and outputs for warning lights, switched inputs, and ADCs for 0-5 sensors and pots for different things.

I was planning on using Spr1-4 on the Ms3x for CAN H, CAN L, GND and 5v between the MS3x and TinyIO. Right now those pins are used for the 2 VR inputs from the 2 wheel speed sensors. If I move the 2 VR speed sensors to the Tiny IOx what sort of conditioning circuit do I need to build? I assume I could reuse the dual VR conditioner board and run the outputs to two of the ADC inputs but I would prefer to not put it there since a friend of mine could use the circuit in his MS3x.

Any help would be appreciated.

Thank you!!
,Shane
5.3LS10
 
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Re: Tiny IOx timer circuit VSS VR conditioner

Postby dontz125 » Mon Apr 17, 2017 10:05 am

A VR sensor needs a fairly specific kind of conditioning circuit in order to make the signal useful to a microprocessor. MS or TIOx, it's all the same. Whether for you or your buddy, sounds like someone's buying a Dual VR board from Jean.

A far as packaging goes, don't forget you already have 5v Vref and an assortment of GND pins already part of the lower DB37. SPR1 & SPR2 are the usual candidates for the CAN lines, but it doesn't really matter. Is this a V3.0 motherboard, or a V3.57? Don't forget the V3.57 has the DB15 with all its extra pins for useful purposes, and it isn't THAT hard to hack a hole in the end plate of a V3.0 to accept a DB15. If I'm not mistaken, the nice folks at DIY will probably be only too happy to take your money and sell you a V3.57 endplate!
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Re: Tiny IOx timer circuit VSS VR conditioner

Postby 5.3LS10 » Mon Apr 17, 2017 8:03 pm

dontz125 wrote:A VR sensor needs a fairly specific kind of conditioning circuit in order to make the signal useful to a microprocessor. MS or TIOx, it's all the same. Whether for you or your buddy, sounds like someone's buying a Dual VR board from Jean.

A far as packaging goes, don't forget you already have 5v Vref and an assortment of GND pins already part of the lower DB37. SPR1 & SPR2 are the usual candidates for the CAN lines, but it doesn't really matter. Is this a V3.0 motherboard, or a V3.57? Don't forget the V3.57 has the DB15 with all its extra pins for useful purposes, and it isn't THAT hard to hack a hole in the end plate of a V3.0 to accept a DB15. If I'm not mistaken, the nice folks at DIY will probably be only too happy to take your money and sell you a V3.57 endplate!


it is a v3.0.

I just wanted to use those 4 pins that way they are together in a group from the harness and easier for me to trace than remember where I tapped into for the 5vref or which ground connection etc...

That is fine about the VR conditioner I just remember it being mentioned in the tinyIO documentation that the timer circuits can be used for VSS but if it requires a circuit that is not easily buildable or documented I would rather move the dual VR conditioner to the tinyio and just use 2 of the ADC inputs.

thanks for the input.

For the ADC circuits and the switched inputs are the circuits on page 31 and 32 of http://www.msextra.com/doc/pdf/MS2V30_Hardware-3.4.pdf correct?

I would think so.

thanks!
Shane
5.3LS10
 
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Re: Tiny IOx timer circuit VSS VR conditioner

Postby dontz125 » Tue Apr 18, 2017 7:48 am

The timer circuits can certainly be used for VSS, but they need a conditioning circuit if the sensor is VR. For a Hall sensor, all that's really needed is something like the ground switch input you noted, perhaps with a 12v pullup outboard of the series diode.

The circuits you suggested are fine. Have a look at the ADC filters used on the MS (schematics, page 168 of the manual) for more ideas. Note that any temperature sensors will need an appropriate bias resistor.
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