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johnbryanmoore / VL53L0X_rasp_python

Python interface to the VL53L0X ST Library
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Random -0.1 value state and never recovers from this state. #22

Open TinManAkshay opened 1 year ago

TinManAkshay commented 1 year ago

Hi -

I have been working with this library for years now. I use 2 distance sensors on the same i2c bus withy unique i2c addressing. Sometimes I run into the issue that either of the distance sensors or both gives -0.1 values randomly and they never recover from this state until I reset the power.

FYI: There are other sensors connected on the same i2c bus as well along with these two distance sensors.

What solutions I can try to mitigate this problem? Any suggestions would be highly appreciated.

Thanks,

rrrRbert360 commented 1 year ago

I faced similar behaviour when the sensor is measuring infinitive (out of range) distance. My workaround is to power the sensor with a gpio output pin. Every 24hrs i drop the power for 10seconds. That worked for me.

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From: TinManAkshay @.> Sent: Wednesday, February 8, 2023 6:48:35 PM To: johnbryanmoore/VL53L0X_rasp_python @.> Cc: Subscribed @.***> Subject: [johnbryanmoore/VL53L0X_rasp_python] Random -0.1 value state and never recovers from this state. (Issue #22)

Hi -

I have been working with this library for years now. I use 2 distance sensors on the same i2c bus withy unique i2c addressing. Sometimes I run into the issue that either of the distance sensors or both gives -0.1 values randomly and they never recover from this state until I reset the power.

FYI: There are other sensors connected on the same i2c bus as well along with these two distance sensors.

What solutions I can try to mitigate this problem? Any suggestions would be highly appreciated.

Thanks,

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TinManAkshay commented 1 year ago

Hi @rrrRbert360 -

Thank you for the response with an insight to the issue. I dug up a little more and found out that after running these sensors for a while, I got -20 (VL53L0X_ERROR_CONTROL_INTERFACE). As far as I know about this error, we get this error at the time of unsuccessful initialization/unique I2C addressing of the distance sensor. I believe getting this error while running the sensor for a while could mean possible scenarios.

  1. There could be a low voltage on XSHUT pin.
  2. Sensor could be loosing its unique address (set via pushing XSHUT to LOW at the beginning of the initialization).
  3. I have seen when distance sensor measures finite distance, it sometimes goes to -1 value state.

Thanks, Akshay