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Product Selection for EGT Sensor/Gauge
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Product Selection for EGT Sensor/Gauge

by rcowan on Tue Oct 30, 2018 8:02 pm

I'm new to the Arduino world but have a project I would like to start. I'm looking for help selecting the correct parts. I'll describe my project and suggest parts that look correct to me..... please correct or confirm. Thanks!

My project will measure Exhaust Gas Temperature on my car and report temperature on a series of 20 LEDs. The higher the temp, the more LEDS will light up. The range of measurement will be 500 degrees F to 2000 degrees F. 1 LED lit at 500 degrees, 20 LEDs lit at 2000 degrees, even steps between 1 and 20 LEDs.

For the parts I am suggesting the following but REALLY open to suggestions:
For the sensor: http://www.exhaustgas.com/ProductDetail.asp?ProductID=1150&DepartmentID=&CategoryID=&RepID=&BasketID= I've used this before on other projects and it has worked quite well. It is more expensive than the Adafruit sensors though so if there's a comparable one, I'm open to suggestions.
For the Thermocoupler Board: https://www.adafruit.com/product/269
Arduino: https://www.adafruit.com/product/50 (assuming they will be in stock soon)
Power Supply/Buck Converter: https://www.adafruit.com/product/1385 This will be connected to my car's 12v power source.

Looking for some feedback. Good plan or are there better products? Thanks in advance!

rcowan
 
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Re: Product Selection for EGT Sensor/Gauge

by adafruit_support_bill on Thu Nov 01, 2018 5:47 am

The link for the temp sensor is not responding with specs. But assuming it is a K-type thermocouple, it should work. The MAC31855 will not work with a grounded junction, so your thermocouple probe should be insulated from the vehicle ground.

You didn't list any LEDs in your parts list. But for a project like that, Neopixels would be a good choice:
http://learn.adafruit.com/adafruit-neopixel-uberguide
These are available in many forms:
https://www.adafruit.com/category/168

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Re: Product Selection for EGT Sensor/Gauge

by rcowan on Thu Nov 01, 2018 5:14 pm

Thank you for the reply. The sensor probe is a K-Type. Preventing any probe from ground will be difficult. The probe will be mounted in the in the exhaust manifold in the exhaust flowstream. All the isolation materials I can think of would melt at 2000 degrees F. Is there a thermocoupler board that can handle a grounded sensor?

Thanks for the Neopixels suggestion. I am not familiar with them but I will check them out!

rcowan
 
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Re: Product Selection for EGT Sensor/Gauge

by adafruit_support_bill on Thu Nov 01, 2018 5:30 pm

The MAX31856 can handle a grounded junction: https://www.adafruit.com/product/3263

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Re: Product Selection for EGT Sensor/Gauge

by rcowan on Fri Nov 09, 2018 1:47 pm

Thank you!

rcowan
 
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Re: Product Selection for EGT Sensor/Gauge

by rcowan on Thu Dec 13, 2018 4:23 pm

I just realized there are only 13 DO pins on the Metro. I would like to turn on/off 20 LEDs individually. I won't be able to do that with this Metro https://www.adafruit.com/product/50, right?

Again, I'm a beginner here, it may be possible. I just don't know how at this point.

rcowan
 
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Re: Product Selection for EGT Sensor/Gauge

by millercommamatt on Thu Dec 13, 2018 5:42 pm

A shift register will solve that issue.

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Re: Product Selection for EGT Sensor/Gauge

by adafruit_support_bill on Thu Dec 13, 2018 7:13 pm

Neopixels are the simplest way to do that. You can control up to about 500 individually addressable pixels using only one pin from the Metro 328.

https://www.adafruit.com/category/168
https://learn.adafruit.com/adafruit-neo ... -neopixels

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Re: Product Selection for EGT Sensor/Gauge

by rcowan on Thu Dec 13, 2018 11:33 pm

The neopixels look cool but I am trying to incorporate this in a car factory gauge cluster. I need 2mm through hole style LEDs. I don't see any that small. I may need to experiment with the individuals behind a hole but that's the only option I see where neopixels might work (https://www.adafruit.com/product/1655). If I'm missing something, feel free to correct me.

rcowan
 
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Re: Product Selection for EGT Sensor/Gauge

by adafruit_support_bill on Fri Dec 14, 2018 6:43 am

Another option would be the TLC5947. This will control up to 24 individual LEDs using 3 pins on the Metro:
https://www.adafruit.com/product/1429

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Re: Product Selection for EGT Sensor/Gauge

by rcowan on Mon Dec 17, 2018 2:25 pm

Thanks! That looks like a good option.

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