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Old 12-21-2017, 10:49 PM   #501
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I was actually looking into getting one of these for water temp monitoring. Is this just as effective as say an aftermarket gauge? I don't know how the temperature is received but I'm assuming from the ECU and I'm wondering how it's all wired up.
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Old 12-22-2017, 10:48 AM   #502
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Yes it connects VIA OBD.
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Old 02-08-2018, 10:32 AM   #503
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Okay... connecting oil temp and pressure sensors to the GoodBox analog aux ports...

Pressure is easy. Plenty of transducers output 0-5V.

Temperature is where it gets weird... Pretty much all sensors are going to work on resistance.
So, is a voltage divider the best option for this?
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Old 02-10-2018, 04:48 PM   #504
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Yes, a voltage divider would work if you feed it a 5V reference. Most universal single-wire sensors are grounded through the mounting thread, so it will be the 'bottom' part of the divider.

But what value of resistor you pair the temp sensor with would depend on the resistance the sensor offers through its temperature range. You wouldn't want to end up with full temperature swing only giving a very small voltage swing, as that wouldn't be very useful and have terrible resolution and accuracy.

What temp sensor did you have in mind? Ideally, they will give resistance specifications over temp range. Or, if unknown, you could measure it yourself by doing as others have done and boiling it in a pan of water while measuring with a multimeter.

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Old 02-10-2018, 06:17 PM   #505
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Thanks for confirming what I've been reading.

Before I torture myself learning any more about electronics, I'm going to try using this and a K-type thermocouple and see if I get enough resolution.
Amazon Amazon

The range from 0C - 130C is 1.25V - 1.9V. It's not great but it should be serviceable enough. If not, maybe I can learn how to proportionally double the voltage output.

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Old 02-11-2018, 09:16 AM   #506
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I wouldn't use a thermocouple. For a start, that output voltage range is the kind of range I was talking about that will give you poor resolution and accuracy. You'll be lucky if the GOODbox can show that to 1C increments. It has a 10-bit ADC which only gives you 1024 value increments and you'd be using just over a fifth of that range.

Also, how would you plan to mount the thermocouple? Off-the-shelf temp sensors obviously have a threaded mounting, but thermocouples are just blobs on the end of a wire.

If you're gonna spend $30+ on stuff for a thermocouple ($14 for the AD8495 breakout board and $16 for the K-type thermocouple), why not go for the 'Fluid Temperature Sensor Kit' for $45 from these guys:

Aeroforce Technology Inc | Products - Sensors

You get a proper sensor (in 3/8" or 1/8" NPT) as well as a 5V reference supply. It's what I have on my car (plus one of their oil pressure sensors) with my GOODbox. Works great, no problems at all for many years.
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Old 02-11-2018, 10:56 AM   #507
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I ordered this off of Amazon.
Amazon Amazon

I plan on using it with this:
https://www.rx8performance.com/produ...or-banjo-bolts

I'm not overly concerned with high precision. Mostly I'm looking for a general health indicator.
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Old 02-17-2018, 11:07 AM   #508
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So, are these still available? work for an 09 RX8?

I have an aftermarket audio setup so the factory screen is just blank right now.
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Old 02-17-2018, 11:25 AM   #509
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I don't have the answers to your question but here's the link to the page:
GoodBox Gauge RX8 | GOODbox Gauges

You could ask them.
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Old 02-17-2018, 11:37 AM   #510
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Found it and ordered it. Looks like it should work fine. Hopefully the expandability will help when I swap the motor to keep the dash clean and clear of gauges.
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Old 02-22-2018, 03:50 PM   #511
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Cool

Jut put an order in too. Haven't heard back yet, but hopefully there are some in stock.
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Old 02-22-2018, 07:35 PM   #512
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I talked to these guys a month or two ago and said they were not going to make more until they had more people on the list. You guys that ordered, have you received any confirmation that yours is being made? I may want to get one now too if I can.
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Old 02-23-2018, 08:01 AM   #513
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You know, now that you mention it, I haven't. I should get in touch with them...
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Old 02-23-2018, 10:22 AM   #514
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Not a peep and I ordered now almost a week ago.
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12v, 5v, antonio, aux, gauge, goodbox, install, mazda, mazda3, oil, pin, pressure, resistor, rx8, san, sensor

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