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Software

Code included with this project is using the Arduino programming environment. Several comprehensive libraries as well as test programs for all sensors were developed for this project.

Data Visualization

SerialUI has similar functions as Arduino IDE serial monitor and serial plotter. However it has arguably better plotting and data visualization capabilities.

Arduino Libraries

Chip Manfacturer Brick Source Example Program Limitations
AFE44X Texas Instrumente Pulseoxi Utzinger Yes No $SP_{O_2}$ yet
MAX30001G Maxim / Analog Devices Bioimpedance and ECG Utzinger No in progress
ES8336 Everest Stethoscope Audio Driver Schatzman Yes tested
ES8336 Everest Stethoscope Audio Tools, Schatzman Yes tested
MPRLS0300YG Honeywell Pressure Sparkfun No to be worked on
ICM20948 TDK IMU Sparkfun Yes need to decide on DMP or custom fusion (AHRS Madgwick)
BMP581 Bosch Pressure Sparkfun Yes sometimes fails to start in SPI mode
WS2812B World Semi Color LED strip Neopixel Yes figure out individual pixel animation
SavitzkyGolay Signal Proc Filter Utzinger Yes need to test with PulseOxi data
SHT45-AD1B Sensirion Humidity, Temperature Sensirion Yes
SCD41D Sensirion CO2 Sensirion Yes
SGP41D Sensirion eVOC, eNOx Sensirion Yes uses Gas Index
SEN5X Sensirion Particulate Matter Sensirion Yes
MICS 6814 SGX Sensortech CO, NH3, NO2 Utzinger No to be worked on (needs manual calibration and soldering)
SSD1306 Solomon Systems LCD display Adafruit Yes
MAX1740X Maxim / Analog Devices Battery monitor Sparkfun Yes need to look into how to detect that the system is on battery
LC709203F ON Semiconductor Battery monitor Adafruit No not available in newer boards from Adafruit and Sparkfun
ESP ADC Espressif Temperature Audio Tools, Schatzman Yes 6 channel recording with averaging and binning
Gas Index Sensirion Gas Index Sensirion Gas Index Yes
Arduino Core Sensirion Arduino Core Sensirion Arduino Core Yes
ESP DeeSleep Espressif Deep Sleep Yes

Integrated Development Environment

Arduino ESP32 is comprehensive and supports the ESP32 internal peripherals as listed here

Arduino IDE Programmer Settings

When programming an ESP32 care must be taken on the proper memory and communication settings. During development the microcontroller will also need to be manually rebooted.

Sparkfun feather boards are more easily manageable as they have less options to configure in the IDE. Adafruit ESP32 boards come in a variety of memory configurations and since Adafruit promotes microPython their boot loader settings vary and are by default not set for the Arduino IDE.

Reboot of the ESP32 is accomplished in software by toggling serial control lines. However this is not reliable and sometimes powercycling is necessary.

If the microcontroller board can not be programmed a manual boot loader reset might be necessary (see below).

Programming support on Windows Platform appears to be more refined than on Linux platform.

Once the microcontroller is mounted inside the MediBrick and the battery is connected, manual reset and reboot are not longer accessible.

Adafruit ESP32-S3 Feather with 2MB of PSRAM

Reset to boot loader:

  • Push boot button and hold it. Push and release reset button. Release boot button.
  • If this does not work, switch to a different USB port on your computer.

The default programming settings are not working well with Arduino IDE and each time the board is selected the following will need to bet chosen:

  • USB CDC on Boot: Enabled
  • CPU frequency 240MHz
  • Code Debug Level: None
  • USB DFU on boot: disabled
  • Erase all Flash: disabled
  • Events run on Core 1
  • PSRAM: OPI-PSRAM
  • Flash Mode: QIO 80 MHz
  • Flash Size: 4Mb
  • Partition Scheme: Default 4Mb with spiffs
  • Upload mode: UART0
  • USB mode: Hardware CDC

Sparkfun ESP32 C WROOM

Reset boot to loader:

  • With power cycle: Push and hold the boot button. Connect the board to a computer through the USB-C connection. Release the boot button.

  • Without power cycle: Push and hold boot button. Press and release the RST button. Release the boot button. (not working on Linux)

  • After programming is completed, reboot the MCU.

    • Press the RST button.
    • If that does not work Power cycle the board.

If you want to use QWIIC: GPIO 0 controls the power output from the XC6222 LDO regulator to the Qwiic connector. Users must toggle GPIO 0 high to enable power for the Qwiic