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M5StackBME280

M5Stack using Smooth C++ library and Littlevgl Graphics library to display BME280 data.

Overview

This application shows how to use the Smooth C++ library and the LittlevGL Graphichs library to display BME280 values in three different views and a view to display the current date and time. The app has three tasks running besides the main Application Task. The details about the application memory usage, bin file size and versions of software used on this project are listed at the top of the App.cpp file.

Views

The following views are dsiplayed by this application.

  • Measurements View - display numerical values of temp, humidity and pressure(sea level)
  • Temperature Gauge View - display temperature value in a gauge and numerical values of humidity and pressure
  • Hourly Temp Log - display an hourly log of temperature over a 24 hour period
  • Time and Date - display the current time (MST) and current date

A view

A view consists of a title pane, a content pane and a menu pane. The title pane is at the top of the screen and the title changes depending upon which view is selected. The content pane varies depending upon the view selected and is positioned in the middle of the screen. And lastly the menu pane is at the bottom of the screen where the 3 hardware buttons on the M5Stack are located. Two menu buttons are supported "NEXT" and "PREV". The app uses LittlevGL input device driver to debounce the buttons. The LittlevGL input device driver creates an on-clicked event when the hw button is pressed and the released. It also shows the gui button pressed or released when the hardware button is pressed or released.

Tasks

The app has 3 additional tasks running besides the Application Task.

  • PollSensorTask - A task that periodically collects measurements(temperature, pressure, humidity) from the BME280.
  • LvglTask - A tasks that runs LittlevGL. All files in gui folder are running under this task.
  • SntpTask - A task that runs SNTP. Updates the local system time on Sntp TimeSyncEvents and publishes TimeValue.

Pictures of the various views

The Measurements View Measurement view

The Temperature Gauge View Temperature Gauge View

The Temperature Hourly Log View Temperature Hourly Log

The Time and Date View Time and Date View

Versions

v1.0 :

  • initial release

v2.0 :

  • update to lvgl v7.11.0 commit ec9de51 - March 16, 2021
  • update to Smooth master commit 5578b8b - April 15, 2021
  • update to esp-idf v4.3-beta3 commit e9cf9e2 - April 14, 2021