Sensor scaling

striker
Posts: 18
Joined: Fri Jun 15, 2012 8:13 pm
Location: Wild West Wales

Sensor scaling

Postby striker » Sun Sep 18, 2016 3:56 pm

I'm currently trying to set up a VDO dip tube fuel sender to a Dash 2.
The resistance measured at the tube when empty is 83 ohms and full is 5 ohms
I have fitted a 100 ohm resistor and I read 0.42V for empty and 0.03v for full.
Is this sufficient of a range to get a meaningful reading on the dash for a 25 litre tank or should I look at another value for the resistor?

Thanks in advance

Support (D)
Posts: 74
Joined: Mon Aug 17, 2015 9:36 am

Re: Sensor scaling

Postby Support (D) » Mon Sep 19, 2016 8:20 am

Hello,

So based on the readings you've collected from the sender, you can use the 100 ohm resistor however it would be best if you use an external 5V regulator, instead of the DASH2's 5v ref.

The DASH2 5V ref is rated for 50mA current draw, connecting this sender to the dash would be get close to this fiure plus any additional sensors you have conected.

Most 5V regulators are rated for 1A current draw so you should be covered, if you have any questions in regards to this let me know and I can assist.

Hope this helps!

Kind regards,
Support (D)

striker
Posts: 18
Joined: Fri Jun 15, 2012 8:13 pm
Location: Wild West Wales

Re: Sensor scaling

Postby striker » Mon Sep 19, 2016 6:28 pm

Hi, Thanks very much for the prompt reply 8)

You'll have to excuse my ignorance but I guess I'm looking at something like this?

http://www.ebay.co.uk/itm/DC-to-DC-Converter-Regulator-12V-to-5V-3A-15W-Car-Led-Display-Power-Supply-UK-/322264637060?hash=item4b08781e84:g:~vsAAOSwP~tW34sf

If so should the units output -ve wire be connected in conjunction with the Dash 2 ground?

Thanks again. :D

Support (D)
Posts: 74
Joined: Mon Aug 17, 2015 9:36 am

Re: Sensor scaling

Postby Support (D) » Tue Sep 20, 2016 8:19 am

Hi,

Yes that should be suitable.

For the conections on the 5V side, look in the link below for the correct connections. (So instead of using the 5V ref out from the dash you'll be using the 5V ref out from the regulator, the GND from the regulator needs connecting to one of the GND's on the dash.)

http://www.race-technology.com/wiki/ind ... ensorToDL1

Hope this helps!

Kind regards,
Support (D)

striker
Posts: 18
Joined: Fri Jun 15, 2012 8:13 pm
Location: Wild West Wales

Re: Sensor scaling

Postby striker » Tue Sep 20, 2016 7:24 pm

Excellent 8)

Thanks very much for your time and help :wink:


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