Desk Weather

by jonathan harrocks

A weather station for the corner of a desk. A BME280 hangs off the CYD's CN1 connector as I2C - GPIO22 is SDA, GPIO27 is SCL, and the other two pins on that plug are 3V3 and ground. The sensor is polled every two seconds, which is slow enough to keep it from warming itself up. Three variables read the three channels; bindings push them into the ring, the bars and the numbers, and the temperature also feeds an hour of history: sixty points paced a minute apart, whatever rate the sensor is read at. The plates, the light behind them and the scale inside the ring are one picture, drawn around the layout, and the ring is an arc with no knob - it reports, so a finger on the glass cannot move it.

About this design

Desk Weather is an LVGL interface for the ESP32-2432S028R "Cheap Yellow Display" (ILI9341 320 x 240, XPT2046 touch), with 1 screen and 18 widgets, made for Arduino (C++) on LVGL 9.

Screens

Screen1

Hardware and build

Board: ESP32-2432S028R "Cheap Yellow Display"
MCU: ESP32 (WROOM / WROVER)
Display: ILI9341
Resolution: 320 x 240
Touch: XPT2046
Graphics library: TFT_eSPI
LVGL: v9
Exports to: Arduino (C++)
Peripherals: BME280
Libraries: lvgl, TFT_eSPI, Adafruit BME280 Library

Notes from the author

BME280 on the CN1 connector: temperature, humidity, pressure and a rolling chart.

Using it

Open a copy in the designer and it is yours to edit: restyle the screens, move it to another board, and export the Arduino (C++) project. Designing is free, and a copy needs no account. Open the designer.