Simple Demo for an ESP32 module with a TFT LCD or an OLED display.
Displays current time and BTC price in USD.
Supports two different modules directly:
- ESP32 with I2C connected SSD1306 driven OLED display (resolution 128x64) made by Lolin as WEMOS LOLIN32
- ESP32 with SPI connected ST7789V driven TFT LCD display (resolution 240x135) made by TTGO as T-Display
It's very easy to modify the source code for any I2C or SPI connected display.
The demo application shows several useful techniques, such as:
- using a single source code with very different displays and graphics libraries
- obtaining current time using SNTP
- obtaining current bitcoin price using a web API
- avoiding JSON library when decoding simple JSON message
- using the Tasker library to call a task periodically or on a button press
To install ESP32 core on Arduino follow the instructions on this page: https://github.com/espressif/arduino-esp32#installation-instructions
Then you'll need to install either SSD1306 or TFT_eSPI libraries and also NTPClient and Tasker libraries. They are available via the Arduino Library Manager.
Please note that the TTGO T-Display requires version 1.4.16 (or higher) of the TFT_eSPI library, otherwise the screen content is shifted by 52 pixels.
Enjoy!
Petr Stehlik https://github.com/joysfera
