v5.3 Website timing and History graph bugfix

Website graph timing improvement: Store CO2 values exactly every 30 seconds.

History graph:
4.2" display now supports full screen.
Bugfix for min Value.

Full Changelog: v5.2...v5.3

v5.2 WiFi reconnect & rewrite values save

The OpenCO2 Sensor now auto reconnects if the WiFi connection is lost (for example a router reboot).

Code refactoring: Rewrite how values are stored. Now up to 24h of measurements are stored in a ring buffer with automatic overflow handling. This replaces the more complex handling of 24 separate arrays containing measurements for 1h each.

Full Changelog: v5.1...v5.2

v5.1 Website improvements & Bugfix

v5.1 Website improvements & Bugfix
Website improvements:

• timestamps now get generated by the client by only transmitting start- and end time
• transmit values in multiple buffers of data

Update README for machine-readable Measurements

Bugfix:
Wi-Fi menu:

• enable handleClient while displaying the IP
• only start wifiManager when not on battery
• update warning screen when power gets connected

Display:

• Refresh full screen when rainbow mode is exited

Full Changelog: v5.0.1...v5.1

v5.0 new Website inc History

Connect the OpenCO2 Sensor to your home Wi-Fi via the Menu. Then Navigate to http://[IP]:9925 to view current values and an up to 24h history graph for CO2 (every 30 sec) and temperature / humidity (every 1.5 min).

Also enlarged Clock and moved Wi-Fi Symbol

Update WiFiManager tzapu/WiFiManager@v2.0.16-rc.2...v2.0.17

Full Changelog: v4.6...v5.0

v4.6 history graph and WiFi response time

History graph

Go to Menu -> History to see up to 18h of CO2 or Temperature/Humidity measurements in a graph. Min/max/avg values will also be displayed. QR code order is inverted now for easier export.

WiFi response time

Improve Wi-Fi response time to 500ms by changing light sleep time and handling the response, before checking if a new CO2 measurement is available. Also added a new cleanup Menu function to refresh display on exit.

Also update README.MD and create MIT LICENSE

Full Changelog: v4.5.1...v4.6

v4.5.1 downgrade arduino-esp32 and WiFiManager

Because of instabilstes / connection issues these two libraries needed to be downgraded again:

arduino-esp32 espressif/arduino-esp32@2.0.13...2.0.16
WiFiManager tzapu/WiFiManager@v2.0.16-rc.2...v2.0.17

v4.5 change Fonts; under the hood refactoring; update libraries

Change between 3 fonts (bahn, gotham, nothing) via Menu -> Display -> Font

Refactoring

• move Menu code into epd_abstraction file
• cleanup same variables

Updated libraries
arduino-esp32 espressif/arduino-esp32@2.0.13...2.0.16

Adafruit_BusIO adafruit/Adafruit_BusIO@1.15.0...1.16.0
Sensirion Arduino Core Library Sensirion/arduino-core@0.6.0...0.7.1
WiFiManager tzapu/WiFiManager@v2.0.16-rc.2...v2.0.17

Full Changelog: v4.4...v4.5

v4.4 Menu: change Language and Invert Display

NEW

• Change Language, Fahrenheit/Celsius and invert the display via new option: Menu -> Display
• Updates via USB mass storage. Just Drag and drop "FIRMWARE.BIN" from now on via your PC (USB MSC update)
• 4.2" epaper menu bugfixes

Update from now on by connecting the OpenCO2 Sensor via a data USB-C Cable (not included) to your PC.
Then copy "FIRMWARE.BIN" onto it via the File Explorer (just like using an USB-Stick).

Update from an older release:
Download "FIRMWARE.BIN" from the latest release. Enable Wi-Fi via the Menu button, in an area where no previously known network is active. Connect power. Then connect your PC/Smartphone to the WiFi Network "OpenCO2 Sensor" and navigate to http://192.168.4.1/update . Select the "FIRMWARE.BIN" file and click Update. The Sensor will restart.

Full Changelog: v4.3...v4.4

v4.3 Holiday Update

New Easter Egg: Santa mode
Menu improvement: register button press while display is updated
WiFi Hostname in home network is now OpenCO2-SensorXYZ

Full Changelog: v4.2...v4.3

v4.2 UI update & LED Menu

LED Menu
Choose the LED state on Battery and on USB Power separately.
Choose the Brightness in 5 steps.
Choose the Color scheme
1=current smooth scale
2=green until 600ppm, light green until 800ppm, orange until 1000ppm, dark orange until 1500ppm, red until 2000ppm and magenta above.

UI Update: Clock, Info, Wi-Fi bring up and German translation
Wi-Fi onboarding improvements: Show a QR code to first quickly connect to the OpenCO2 Sensor. Afterwards when OpenCO2 Sensor is connected to a home Wi-Fi, a QR code with the IP and Port is displayed.

New Menu point "Info": displaying mac Address, SCD4X Serial number, ESP32 Core temperature, up-time, Software Version, Battery Voltages and if connected to Wi-Fi: signal strength and IP.

New on Wi-Fi: Display the Berlin NTP time.

Optional: German translation

Full Changelog: v4.1...v4.2