Tire pyrometer array & brake disc temp sensor idea

All sensor specific discussions! Temperature, pressure, steering angle, brake and throttle, etc. Post adaptations of OEM-style sensors, and also your clever DIY hacks and custom designs here too!

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GameboyRMH
Posts: 55
Joined: Mon Jan 07, 2013 10:45 pm

Post by GameboyRMH »

Sorry, no updates for now. The car that the RCP is going into is getting a major overhaul and that's been tying up my time & money. I think this project will get going later in the year.

I should add that another idea I've had for communications between the sensors and the RCP is a board that will multiplex the inputs based on a PWM signal from the RCP. Should work and tie up only two RCP pins if it can switch & read values fast enough - 1hz resolution is about the bare minimum I'd want.

mrldcty
Posts: 27
Joined: Tue Jan 08, 2013 1:26 am

Post by mrldcty »

I REALLY want real time tire temp telemetry! Any updates?
Spec Racer Ford #40

GameboyRMH
Posts: 55
Joined: Mon Jan 07, 2013 10:45 pm

Post by GameboyRMH »

None yet...My car's gonna be done this month, I think I'll get started on this in December.

MichaelDrost
Posts: 30
Joined: Tue Aug 13, 2013 12:15 pm
Location: Amersfoort, the Netherlands

Post by MichaelDrost »

As an alternative: http://www.opti-grip.com/optigrip/Opti-Grip.html

I've bought them and they work! They're a bit chunky and were hard to fit in the wheel well of an e30 325i, but they were worth the price tag!

Simple sensor, connects via usb cable to a central unit, that outputs 0-5v per sensor, senses 260 degrees C max.

Michael

GameboyRMH
Posts: 55
Joined: Mon Jan 07, 2013 10:45 pm

Post by GameboyRMH »

Huh the price isn't too harsh on that, $450 for 3 sensors per tire...not cheap enough for me though :P

mrldcty
Posts: 27
Joined: Tue Jan 08, 2013 1:26 am

Post by mrldcty »

FYI, ran across this in my research: http://www.honors.ufl.edu/apps/Thesis.aspx/Download/800

Contains source code in the appendix.

Not sure if a single I2C bus will handle all twelve sensors though? Puts sensor cost at around $50/corner.
Spec Racer Ford #40

andylaurence
Posts: 43
Joined: Tue Apr 30, 2013 10:35 am

Post by andylaurence »

That Opti-Grip system looks good, but it'll tie up 12 inputs. Is it possible to interface I2C sensors directly to the RCP? What form does the RJ-45 expansion port take?
Sprinting an ADR Sport 2
www.endurancelay.co.uk

neoraptor
Posts: 43
Joined: Thu May 16, 2013 3:08 pm
Location: Alsace, France

Post by neoraptor »

RCP has 2 serial ports.
These sensors (Melexis MLX90614) outputs either I2C or PWM. So you would need to integrate a microcontroller to make the conversion and send it back to RCP.
On the RCP side, you will also need to write a code to record these channels.

The other solution is to use the system that outputs directly 0-5v signals and record them (but you will only be recording tyre temperature).

But I agree, this system looks really good.

andylaurence
Posts: 43
Joined: Tue Apr 30, 2013 10:35 am

Post by andylaurence »

Any ideas how to read the serial port with RCP? I think it's beyond me at the moment - I suspect it's a firmware thing as LUA isn't going to parse serial data fast enough, is it? OnTick only runs at 1Hz...

On a similar note, I've got a TTL serial output from my ECU, so being able to read that would be brilliant as it gives a stream of all my sensor detail at a high refresh rate. There's a separate logger available, but I'd rather have it all in one unit so I don't have to combine CSV files and, most importantly, so I can buy the RCP Bluetooth adapter and analyse the logs between sessions on my phone/tablet.
Sprinting an ADR Sport 2
www.endurancelay.co.uk

neoraptor
Posts: 43
Joined: Thu May 16, 2013 3:08 pm
Location: Alsace, France

Post by neoraptor »

I think it is plan to raise the script frequency to a custom value in a future firmware update (http://www.autosportlabs.net/RaceCaptur ... ature_List).
Also, reading the data each second will not be a problem (and it might be enough for the tires).

There is a function to read the data from a serial port in Lua. http://www.autosportlabs.net/RaceCaptur ... aScripting

If you know the format of your data, it should not be a problem to read them from RCP.

toga94m
Posts: 127
Joined: Wed Jun 05, 2013 1:57 am
Location: Upstate NY

Post by toga94m »

Autosport Labs Facebook page posted info on this 8x8 thermal array sensor today, though it's been out for a year or more. Panasonic makes the sensor. Looks like they expect it to be a human body detector rather than a motorsport sensor. 60-degree field of view, up to 5 meters away.

$75 evaluation board, with USB output and PC software. Bare sensor module is about $40.
http://www.digikey.com/product-search/e ... grid%20eye

link to docs
http://eewiki.net/display/projects/Pana ... 0and%20GUI

Manufacturer promo video
http://www.youtube.com/watch?v=wOTOQfU5Qgw

tom

dimondjack
Posts: 101
Joined: Tue Jan 15, 2013 1:37 pm

Post by dimondjack »

This looks incredibly cool. 10 frames/second! That's a lot of data. Hopefully someone with more time can tinker up an interface between the dev board and the expansion port.

mrldcty
Posts: 27
Joined: Tue Jan 08, 2013 1:26 am

Post by mrldcty »

Here is another array sensor option: http://www.melexis.com/Infrared-Thermom ... 0-776.aspx

I was thinking, with an IR source on the upright (next to the tire) as a temp calibration and location reference, an array-type sensor could be mounted in a stationary location (e.g., body/frame), eliminating the need to mount the whole array on the upright. This would avoid the un-sprung weight, temperature/vibration proximity effects, and perhaps even sanctioning body regulation issues. hmmmm....
Spec Racer Ford #40

brentp
Site Admin
Posts: 5986
Joined: Wed Jan 24, 2007 6:36 am

Post by brentp »

It looks like the melexis is the top contender for a non-contact sensor. We're discussing the possibility of taking this on as our next accessory / sensor project. hold tight -
Brent Picasso
CEO and Founder, Autosport Labs
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russian
Posts: 1
Joined: Sun Apr 27, 2014 4:11 am

Post by russian »

mrldcty wrote:Here is another array sensor option: http://www.melexis.com/Infrared-Thermom ... 0-776.aspx
That's a cool one, order placed :)

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