RejsaRubberTrac
Trouble getting temperature data
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PhillipOliveira
Toronto, Canada
Här sen Jan 2020
Inlägg: 5


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Hey Magnus,

First of all - a huge thanks for putting the software and guide together. It's a seriously impressive feat.

I was hoping you could help me out with some troubleshooting. Here are the parts i'm using:
- nRF52832 Bluefruit Feather
- VL53L0XV2
- MLX90621 GY-906LLC-DCC

I've loaded up your software and I'm able to get data from the laser distance sensor (transcribed into suspension travel) on RaceChrono, but no matter what I try I can't get any temperature data. (I'm seeing 0C)

I know I'm not using the sensor recommended - could that be the issue? I've checked that all pins on the daughter board are recieving 3.3V and none of them are bridged. I'm out of ideas.

I'm having an impossible time finding a seller for a MLX90621 GY-906LLC-BAA that includes the daughter board. Any suggestions? My car is too low to use GY-906LLC-BAB.

Thank you from Canada!

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Phillip Oliveira
www.drivermod.ca
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Magnus Thomé
Stockholm
Här sen Nov 2002
Inlägg: 38541

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All MLX90621 version works fine.

Have you tried opening the serial terminal on the USB port to see what you get there?

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PhillipOliveira
Toronto, Canada
Här sen Jan 2020
Inlägg: 5


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Hey, thanks for the response.

I have. I'm seeing "0" across the board for temperature.

Are there any other troubleshooting steps you'd recommend?

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Phillip Oliveira
www.drivermod.ca
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Magnus Thomé
Stockholm
Här sen Nov 2002
Inlägg: 38541

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Do you have two boards/sensors and both do the same or is it just one that is misbehaving? I once received a broken sensor, DOA. I wish I could remember how it behaved though, if it resulted in all zeros or something else. But I got it replaced and everything worked immediately when replacing it.

Obviously the I2C bus is working so it can't be that.

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PhillipOliveira
Toronto, Canada
Här sen Jan 2020
Inlägg: 5


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I have two sensors, and I've had them both with the same result.

I'm thinking that I'll try a new bluetooth board and a new sensor to see it that produces a different result.

Can you recommend somewhere I can buy a MLX90621 GY-906LLC-BAA from?

This is the only place I've found, but it doesn't include a board: https://www.mouser.ca/ProductDetail/Melexis/MLX90621ESF-BAA-000-TU?qs= . . . .

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Phillip Oliveira
www.drivermod.ca
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Magnus Thomé
Stockholm
Här sen Nov 2002
Inlägg: 38541

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I've never seen the wide 120 degree BAA sold with a board actually. But you really don't need it. I have built units with 120 degree sensors myself.

Since the distance sensor works there can't be any shorts on the i2c bus SDA or SCL.

Did you measure very roughly 2,7 volts directly on the temp sensor power pin?

And triple checked that the temp sensor is mounted correctly rotate wise? The newer 90640 has a changed pin layout (it's rotated with the protruding tab indicator at a different angle) but AFAIK the 90621 has never changed, I've only seen one pin layout and tab orientation for it.

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PhillipOliveira
Toronto, Canada
Här sen Jan 2020
Inlägg: 5


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I'll check voltage to the sensor PIN when I get home today. Last time I checked, I believe it measured roughly 3.3v. This was with the board plugged into a laptop, not battery powered.

The sensors came mounted to the board so I'm thinking I can rule out them being mounted incorrectly. I was trying to have to avoid needing to mount the sensor to the board myself.

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Phillip Oliveira
www.drivermod.ca
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Magnus Thomé
Stockholm
Här sen Nov 2002
Inlägg: 38541

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Oh, wait, I didn't read properly, I was thinking you already had the 120 degree wide sensors without board. You have the one with a board.

Are you sure it's a 90621 on the board and not the completely different 90614?

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PhillipOliveira
Toronto, Canada
Här sen Jan 2020
Inlägg: 5


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Yep, unless Aliexpress lied to me lol. I'll check actual boards again when I get home tonight.

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Phillip Oliveira
www.drivermod.ca
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RejsaRubberTrac
Trouble getting temperature data
2 besök senaste veckan (1699 totalt)


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