Crudus Sense

Todo

• Clean up main.cpp
  • Segment out setup for sensory
• MQTT
  • [-] Setup MQTT with new auth (token) and topics
    • Failed to connect with JWT-token. The token is too long to be sent via current library
      • Check other libraries
        • Check Espressif MQTT Protocol
  • Setup MQTT to subscribe to updates from server
  • Add posibility to override MQTT settings
  • Setup MQTT Auto discovery for Home assistant
• OTA
  • Remove hardcoded token
  • Use JWT token to authenticate with backend
  • Get https working on ESP
    • Pull CA-cert from letsencrypt via http
  • OTA on demand (MQTT or BLE)
  • Ability to opt-out of auto updates
• Sensors
  • Clean up MQTT JSON types - some are strings that should be int’s.
  • Calibrate ADC
  • BSEC
    • Setup first time calibration sequence
    • Check updates for Algo library
    • Inject calibration variables to BSEC from preferences
    • Store IAQ state to preferences
  • Pressure / altitude
    • Subscribe or fetch pressure by sea-level for altitude sensor
  • Audio
    • Get DB-like values
  • Battery
    • Better charing values
    • Calculate 0-100% again after changes to code for sampling
  • Photoresistor
    • Calculate 0-100% again after changes to code for sampling
• WiFi
  • Remove hard-coded Wifi setup
  • Handle no SSID / SSID Password for onboarding via bluetooth
• BLE / Bluetooth
  • Check out if current BLE setup can be used with / as a iBeacon
  • Configure pin security to device
  • Get RSSI from near Sense devices
  • Identify device by sending blink command via ble
• OLED Display
  • Setup layout for release
    • Air quality
    • Audio
    • Battery
    • Temperature / humidity
  • Move debug layout code from main.cpp into display class
• Build
  • Setup build in CI with the different options with sensory
• Other
  • Fix memory leaks
• Tests
  • Write tests

Functionality

Sleeptracking

• Sleep Tracking using an Arduino

Softreset via button

• LONG PRESS RESET BUTTON?

Send and recieve IR commands

• Adafruit: Sending IR Codes
• Github: IRremoteESP8266

External temperature sensor

• PlatformIO: DallasTemperature

Bluetooth

• Vendor list
• Company identifiers
• ESP Bluetooth collector
• ESP32 MP3 Decoder
• How to Calculate Distance from the RSSI value of the BLE Beacon
• ESPHome Bluetooth proxy

Notes

Interrupts

• Configuring & Handling ESP32 GPIO Interrupts In Arduino IDE
• PIO Platform espressif32

ADC

• ESP32 How to correct the ADC
• How to use ADC of ESP32 – Measuring voltage example

IAQ - BSEC

BSEC documentation

IAQ Accuracy=0 could either mean:

BSEC was just started, and the sensor is stabilizing (this lasts normally 5min in LP mode or 20min in ULP mode), there was a timing violation (i.e. BSEC was called too early or too late), which should be indicated by a warning/error flag by BSEC,

IAQ Accuracy=1 means the background history of BSEC is uncertain. This typically means the gas sensor data was too stable for BSEC to clearly define its references,

IAQ Accuracy=2 means BSEC found a new calibration data and is currently calibrating,

IAQ Accuracy=3 means BSEC calibrated successfully.

JSON

• JSON size allocation assistant

Audio

Measure with tone generator and find coefficients with Linear Regression Calculator.

For next revision: i2c microphone

float spl = ( 20 * log( adcMax - adcMin )) + 35.13;

Components

MAX9814

The MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias.

• Datasheet

Note

Pin 14, TH: AGC Threshold Control. TH voltage sets gain control threshold. Connect TH to MICBIAS to disable the AGC. To disable AGC we can remove resistor R20 and R19, and solder a bridge between the pads on R19.

CMA-4544PF-W

Electret condenser microphone.

• Datasheet

Articles

• Adafruid: Measuring dB with MAX9814
• Arduino Frequency Detection
• Arduino Whistle Detector Switch using Sound Sensor
• ESP32 Voice Streamer
• esp32_SoundRecorder
• Measure Sound/Noise Level in dB with Microphone and Arduino
• PICCOLO: Tiny Arduino music visualizer!
• Sound Level Meter with Arduino IDE, ESP32 and I2S MEMS microphone

Light

Alternative to LDR is a BH1750 chip. This is for next revision?.

• BH1750 Digital Light Sensor
• Design a Luxmeter Using a Light Dependent Resistor

Measure EV -> Lux with Sekonic Flashmate and find coefficients with the calculator used to find dB coefficient.

How to use an incident illuminance (LUX or FC) meter

EV - Exposure value

1. Mount the Lumidisc accessory
2. Set EV mode and ISO 100.
3. Measure with the area to be measured parallel to the Lumidisc.
4. Determine the illuminance (lux) from the calculation table using the measured EV.

EV Value -> Lux conversion table

BLE device configuration specification

MQTT publish Topics

MQTT Subscribe Topics

Extensions

CCS811

Alternativ chip: CCS811 (indoor air quality sensor)

• ADAFRUIT CCS811 AIR QUALITY SENSOR BREAKOUT - VOC AND ECO2