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• Pi Zero Version

  anfractuosity • 06/08/2022 at 15:53 • 0 comments

  I'm now working on a pi zero based version, which I've added to github here - https://github.com/anfractuosity/placemon

  
  It uses
  

  • LSM303AGR - accelerometer and compass
  • SHT30-DIS - temperature and humidity sensor
  • GMA4030H11-F26 - PDM microphone
  • VL6180V1NR - Laser ToF sensor

• New PCB revision

  anfractuosity • 09/08/2020 at 16:08 • 0 comments

  I recently got a new PCB revision and the footprint appears to be correct, as I can now flash the ESP32
  

  However when the firmware runs, I get the following messages repeated through the USB serial terminal (meaning the chip keeps resetting as far as I understand):
  

  rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
  configsip: 0, SPIWP:0xee
  clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
  mode:DIO, clock div:1
  load:0x3fff0030,len:4
  load:0x0034ffff,len:455360511
  ets Jun  8 2016 00:22:57
  
  rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
  configsip: 0, SPIWP:0xee
  clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
  mode:DIO, clock div:1
  load:0x3fff0030,len:4
  load:0x0034ffff,len:455360511
  ets Jun  8 2016 00:22:57

  I'm not sure if this a software or hardware issue at the moment.  Any pointers would be most appreciated! 
  

  I seem to be able to write and read from the flash ok from what I can tell.
   

• Machine learning

  anfractuosity • 06/30/2020 at 12:50 • 0 comments

  Whilst I am working on re-designing the PCB, to use the correct esp32-d0wd footprint, I am also going to investigate making use of TensorFlow via Python, to recognise different acoustic events in a house.

  To do this I will record various sounds in a house using a microphone and a laptop, I will then attempt to classify these events using TensorFlow.  I was planning on looking into using a convolutional neural network to achieve this.
  

  
  Some of the acoustic events I will attempt to detect, include:

  • Door opening
  • Tap running
  • Light / mains switch being turned on/off
  • Smoke alarm
  • Blender
  • Gas hobs on oven being turned on
  • Phone ringing
  • Microwave oven / standard oven beep
  • Kettle finished boiling
  • Fridge turning on
  • Toaster popping

  I am also curious if an end user could train the system to detect new events by allowing the classifier to be updated.

  I've just started evaluating the classifier from https://github.com/drscotthawley/panotti/ using sound files for smoke alarms etc. from - https://freesound.org/browse/ .  It makes use of TensorFlow for creating the model.
  

• First attempt

  anfractuosity • 06/24/2020 at 23:28 • 0 comments

  Unfortunately there was a rather big flaw in the current version of the PCB, making the ESP32 non-functional.  I had used a footprint for the ESP32-d0wd chip which is incorrect.

  
  I am currently working on redesigning the PCB with a correct footprint.

  
  With the current PCB revision, the USB chip however does appear functional as it is detected by my computer.

  
  The PCB with the footprint flaw is shown below, it was designed using KiCad 5.
  

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