Dual VR V2.1

http://jbperf.com/dual_VR/index.html

Re: Dual VR V2.1

Postby Doddy Fidelis » Mon Nov 25, 2013 1:05 pm

Hi Jean,

I'm thinking about dual Vr conditioner board for 1 Uz VVti. it have 4 ssensors in total and Ms3pro only have 2 sensor ports ready. I'm thinking using the internal version with 5v sourced from tps 5v. Can this be done?

Thanks,
Doddy
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Re: Dual VR V2.1

Postby jbelanger » Mon Nov 25, 2013 2:10 pm

You certainly can power the board from the TPS 5V but there are a few caveats. I've never had an MS3Pro in hand so I don't know if there is any space available for the board; granted the dual VR board is quite small (0.775"x0.775") but you don't want it shorting components on the MS3Pro board.

And if there is space in the case, then the issue becomes how you do you connect the sensors to the board? Are there any spare connector pins or do you have to drill a hole in the case to route the wires through?

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Re: Dual VR V2.1

Postby Doddy Fidelis » Mon Nov 25, 2013 2:31 pm

I'm going to put it outside the box and power it from TPS 5v wire. :)
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Re: Dual VR V2.1

Postby jbelanger » Mon Nov 25, 2013 2:34 pm

Ok. But then you need to put it in something to protect it against the elements.

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Re: Dual VR V2.1

Postby Doddy Fidelis » Mon Nov 25, 2013 11:52 pm

Does the external version comes with enclosure or box? If it does then I think I'll go for external version. I'm thinking about put it in a 1"x 1,5" plastic box and wrap it with shielding wire.
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Re: Dual VR V2.1

Postby jbelanger » Tue Nov 26, 2013 12:30 am

The external version only adds a 5V power supply on the board so that it can be powered by a 12V source; it still needs to be protected in some way.

I'm not sure you really need the shielding. I wanted to try to see if using some sealing shrinkwrap tubing gave good results but I haven't tried yet; it would likely require using 2 different sizes to cover and seal the board itself and the wires soldered to the board. That would allow placing the board almost anywhere in the wiring loom.

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Re: Dual VR V2.1

Postby downside190 » Thu Dec 05, 2013 5:15 am

Hi

I'm quite new to this whole megasquirt thing and someone recommended this board for use with the VR sensor for my engine. I've just purchased the Jean Duel VR 2.1 board and I'm looking to wire it up to my MS1 2.2 board. I have followed instructions posted by JBelanger but wanted to confirm these are correct.

Heres a diagram I've made http://imgur.com/LK9RXgE so I can visualise how its supposed to be wired up (apologies for the crappy diagram in advance). Does this look correct or am I doing it wrong?

Thanks
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Re: Dual VR V2.1

Postby jbelanger » Thu Dec 05, 2013 11:10 am

It does look correct except for one very important thing: you've mixed 5V and ground. Pin 2 on U5 is ground and pin 3 is 5V; you definitely don't want to invert those.

And now that you are approved your posts won't have to go to moderation before appearing on the forum. You can delete one of your posts above.

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Re: Dual VR V2.1

Postby downside190 » Thu Dec 05, 2013 6:16 pm

jbelanger wrote:It does look correct except for one very important thing: you've mixed 5V and ground. Pin 2 on U5 is ground and pin 3 is 5V; you definitely don't want to invert those.

And now that you are approved your posts won't have to go to moderation before appearing on the forum. You can delete one of your posts above.

Jean


I've just edited the duplicate and thanks for the reply, i'll edit my diagram for when I use it so I don't mess it up.
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Re: Dual VR V2.1

Postby downside190 » Sat Jan 04, 2014 3:04 pm

Hi just a quick question, if i want to connect the second sensor to this board using the VR2+ and vR2- pads where on the megasquirt 2.2 board do I connect these to? Also I plan on using this for a cam and a crank sensor which is why i need to use both. Is this suitable for what I need?
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Re: Dual VR V2.1

Postby jbelanger » Sat Jan 04, 2014 3:52 pm

VR2+ and VR2- on the dual VR board can be connected to X12 and X13 and your sensor will connect to pins 27 and 29 on the DB37. Out2 will need to be connected to pin 11 of U1 (CPU).

And yes this is what you need to use a crank and cam sensor. I assume both are VR sensors.

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Re: Dual VR V2.1

Postby m400 » Sun Jan 05, 2014 10:47 pm

I plan to use your board to tap into my VSS wheel sensor signal so that I can wire it as an input to my MS3. The VSS sensor in the Noble has 3 wires coming out of it, 12V, ground, and a single ended output signal. I understand that the output signal should connect to VR+ on your board, but should I tie the VR- input to ground, or let it float?

Jeff
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Re: Dual VR V2.1

Postby jbelanger » Sun Jan 05, 2014 11:02 pm

Jeff,

That sounds like a Hall sensor so you would leave VR- floating. Also, you have to make sure the signal is a 0-5V (or 0-12V) signal and not an open collector (or open drain) signal. In that last case, you would need to add a pull up resistor to either 5V or 12V.

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Re: Dual VR V2.1

Postby m400 » Sun Jan 05, 2014 11:27 pm

I know it sounds Hall-ish, but it outputs a VR spike waveform. Still leave VR- floating?

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Re: Dual VR V2.1

Postby jbelanger » Sun Jan 05, 2014 11:30 pm

If it's a zero crossing signal then ground VR-. The trigger point is 0V when VR- is grounded and 2.5V when it is floating. You can see why you need to leave it floating for a Hall sensor and not for a zero-crossing signal.

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Re: Dual VR V2.1

Postby Doddy Fidelis » Tue Feb 18, 2014 10:04 am

Hi Jean,

I accidently soldered this tab on the back of your board. If this two tabs suppose to be populated or blank or soldered together? My board is the internal version. Thanks.
Attachments
dual_VR_v2_1_bottom.jpg
dual_VR_v2_1_bottom.jpg (13.53 KiB) Viewed 9658 times
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Re: Dual VR V2.1

Postby jbelanger » Tue Feb 18, 2014 12:02 pm

If you have the internal version, it must have both sides soldered together which is how it came from me. This bypasses the unpopulated on-board 5V voltage regulator circuit.

That is why it is not soldered on the picture because the picture is of an external version with the populated circuit.

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Re: Dual VR V2.1

Postby Doddy Fidelis » Wed Feb 19, 2014 12:02 am

Ok. Thanks.
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Re: Dual VR V2.1

Postby TGS » Wed Jul 23, 2014 6:05 am

Hello,

For a logging device with 24 TTL inputs, I'm looking for a VR conditioner which can convert speed signals to TTL level (means 12 times VRboard 2.1?). First idea was to make a VR conditioning board by myself, but than I found your nice ready to use board on the internet. It must convert hall sensors/proximity sensors (NPN & PNP) as well magnetic pickups to TTL. Is this possible? Do you have maybe made a kind of manual with information about the maximum voltage, whats the minimum voltage to give high TTL, and how to connect?

Regards TGS.
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Re: Dual VR V2.1

Postby jbelanger » Wed Jul 23, 2014 11:36 am

Yes, you would need 12 boards to have 24 inputs. And you can connect a Hall sensor by connecting it to the VR+ input and leaving the VR- floating; you will also need a pull up resistor (to 5V or 12V) if the sensor has an open collector output.

The maximum voltage is more than 100V but the exact value will depend on the signal shape since it is limited by the power rating of the input resistors. The minimum voltage for detection is limited by the chip at 15mV for a VR sensor. The output will get triggered by a zero-crossing side. When using a Hall sensor, the trigger is set at 2.5V (since there is no zero-crossing).

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