[Solved] Zero sensor values

[BobC]

All seems good! At least the sensors demo now works for me.

Sorry for the delay. I physically broke (in two) the uSD card in my Pi3 when I accidentally pushed down on it while trying to remove the Matrix. Naturally, I had no backup and no spare uSD cards. Had to go shopping then reimage, reinstall and recreate everything.

We all know the moral to this story… Keep live backups! I now keep a thumbdrive in my Pi3, and run the following after any significant system change.

$ sudo mount /dev/sda1 /mnt && sudo dd if=/dev/mmcblk0 bs=1M | gzip /mnt/${HOSTNAME}.$(date +%s).img.gz && sudo umount /mnt

[yoelrc88]

Hi @BobC, great to hear that !

Hope @rkeithbeal, @analog71 and others users could test this too.

[analog71]

@BobC @yoelrc88 sorry guys I’ve had no time to look at this for a while. Day job is keeping me too busy. Will try give it some time over the holidays.

[analog71]

@yoelrc88 @BobC @rkeithbeal Got some time to play with this today. All working now or at least I can run the HAL demos provided. The “mic_demo” still returns “0” for me but the “mic_energy” demo seems to work fine in that the LEDs light up RED in response to sound. The “sensor_status” program returns the following:

IMUY:-1.6e+02° IMUR:-3.4° IMUP:-0.93°
HUMI:29% HTMP:34°C UVID:33
PRSS:1.0243e+05 PrAL:-91.75 PrTP:32.375
MCU :0x10 VER :0x161026

And the “sensor_demo” program:

yaw = -161.916° roll = -0.856716° pitch = -0.83855°

humidity = 28.3058 %
temperature (from humidity sensor) = 35.0635 °C

pressure = 102412 kPa
altitude = -90.25 meters
temperature (from altimeter) = 33.25 °C

UV = 22.0187

MCU ID = 0x10
MCU version = 0x161026

Leave it there for today. HW seems to be functioning. Now I need to figure out how to access the sensors from a Python program say on the RPI in order to use the HW for something

[analog71]

@BobC @yoelrc88 @rkeithbeal I guess I had to check the mics some more. I followed the instructions outlined here and it seems to work.

matrix-io/matrix-creator-quickstart

I converted one of the files to .WAV and played back. The recording is audible but I needed to max the ALSA PCM gain to 4dB. Also a fair amount of noise in the recording when I played back.

[analog71]

sorry seems to be known issue with noise

Noise in sound recording

Hi – I want to record sound using the microphone array. The first thing I tried was running the micarray_recorder demo. I can successfully record and convert the output files to .wav and listen to them on a computer (or on the pi). However, the output is very noisy. There is a high frequency component–a square wave, which I notice as a buzzing sound during playback. I listened to all 8 audio channels and they all have the noise. I was able to cut down some of the noise by disabling WiFI and us…

[yoelrc88]

Hi @analog71,

Did you find how to get clear audio? In the post you mentioned the final conclusion is here : Noise in sound recording - #3 by ricardog

The problem was malos running at the same time that the user app :

@ricardog

If I kill the malos process (there are two versions of it running on my raspberry pi), I can record “clean” sound from micarry_recorder

Let us know your progress con this !

Yoel

[analog71]

Hi @yoelrc88
I haven’t tried yet. How do you kill this Malos process?
Can I remove this Malos and just use the low level drivers to directly access the HW via HAL?

There is a description here (Overview diagram seems to have been deleted?)

[Solved] How do I get started exactly?

Hey @ScottChapman @JaNe @LengZai @daadu, Sorry for the confusion. We’ve developed several layers of technology that let you interact with the hardware. People use it at all levels, and it’s hard to portray the interactions with each, so I’ll try to explain it in one post (maybe this can turn into the documentation starter). If you guys think there’s something additional missing from this, let me know. I would love more feedback. We’ve developed the software/hardware so you can operate the MATR…

Cheers,
Anthony

[yoelrc88]

Yes @analog71, one valid option is just use HAL as a lower layer to access the data from the MATRIX Creator. As you said in that case you dont need MALOS or MOS. I recommend you to do a clean install from scratch just using HAL.

to kill malos you can try:
sudo pkill malos

Let us know is you have any problem with HAL

Yoel

[rtkhn]

I received my matrix voice two weeks ago and am a little stuck now…
I know this thread is already solved, but I think I have the described problem also and already tried everything that was suggested here.
What works:

• LEDs
• MIC Demos (HAL)

But:

• All sensor (temperatur, humidity, …) values 0
• MCU ID = 0x0
• MCU version = 0x0

I’ve already tried different power supplies, but with no success.
Is anyone facing the same problem?

[loom]

The Matrix Voice has no sensors, only the Creator…

[rtkhn]

@loom aaah, thanks a lot for your instant reply!
Seems like I was a little confused here ,
So the positive thing is: everything works as expected then