Sandor Laboratories Seismometer

This is a project to create a homemade seismometer

Usage

Data Collector

Sample Format

Samples are output with the C-format string S|%02X|%08X|%016llX|%016llX which corresponds to S|<key>|<index>|<timestamp>|<data>. Samples may be easily filtered via grep 'S|<key>' and separated by the | deliminator.

Currently the following log keys are defined:

  - INVALID                  =  0
  - Accelerometer X          =  1
  - Accelerometer Y          =  2
  - Accelerometer Z          =  3
  - Accelerometer M          =  4
  - Accelerometer X Filtered =  5
  - Accelerometer Y Filtered =  6
  - Accelerometer Z Filtered =  7
  - Accelerometer M Filtered =  8
  - Accelerometer TEMP       =  9
  - Pendulum 10X             = 10
  - Pendulum 100X            = 11
  - Pendulum Filtered        = 12

Commands

• Force a soft-reboot: REBOOT
  • Reboot is triggered via a watchdog timer timeout so soft-reboot cannot be triggered if stalled or if the watchdog timer is disabled.
• Reset EEPROM: RESETEEPROM
  • Resets EEPROM to default values
  • Command input must be an exact match (e.g. no trailing space)
• Set Sample Key Mask: SAMPLEKEYMASKSD<key mask>, SAMPLEKEYMASKSTDOUT<key mask>
  • Configures which sample channels are actively logged to the SD card and STDOUT respectively
  • Key masks must be passed as hexadecimal mask with each bit corresponding to a key to be logged (LSB is key '0')
• Set RTC: T<unix epoch in seconds>
  • Example setting RTC via Bash and UART: echo T$(date +%s) > /dev/ttyACM0

Dependencies

Data Collector

• SD Card Library: carlk3's no-OS-FatFS-SD-SPI-RPi-Pico
  • https://github.com/carlk3/no-OS-FatFS-SD-SPI-RPi-Pico
  • Tested with version 1.0.8
  • Library source directory at data_collector/lib/no-OS-FatFS-SD-SPI-RPi-Pico
• Optional
  • Compression Library: zlib
    • https://zlib.net/
    • Enable with CMAKE flag ENABLE_ZLIB_DATA_FILE_COMPRESSION
    • Tested with version 1.2.13
    • Library source directory at data_collector/lib/zlib

PCB

• Digikey KiCad LIbrary
  • https://github.com/Digi-Key/digikey-kicad-library
• ncarandini's KiCad RP Pico Library
  • https://github.com/ncarandini/KiCad-RP-Pico
• MCU-6500 Model
  • https://www.snapeda.com/parts/MPU-6500/TDK%20InvenSense/view-part/