how to EEZ Studio data in to Arduino - TFT_eSPI - LVGL Two buttons send data into Arduino

EEZ Studio data in to Arduino - TFT_eSPI - LVGL Two buttons send data into Arduino. Lets have some fun. I found this tough going so thought I would share what I have learned. I am no expert but enjoy to learn new things. How to get data from an EEZ Project UI screen into an Arduino sketch or VS Code code.

A long video but once you have done it you can just copy the folder to make another project using the same screen type

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"TFT eSPI" refers to the use of a TFT (Thin Film Transistor) screen with the TFT_eSPI library, often on microcontrollers like ESP32 or Arduino. TFT is a display technology where each pixel is controlled by a transistor for high resolution and clarity. The TFT_eSPI library provides fast, performance-optimized graphics and font capabilities for these 32-bit microcontrollers, allowing users to create complex visuals on small displays.
What is a TFT screen?

Thin Film Transistor (TFT):
A type of LCD (Liquid Crystal Display) where each pixel is controlled by its own transistor, acting as a switch to control the amount of light passing through.

Active Matrix:
TFT displays are also known as active-matrix displays, which ensures better resolution and image quality compared to older passive-matrix technologies.

Color and Clarity:
TFTs use color filters (red, green, blue sub-pixels) and control liquid crystal orientation to display full-color images with high clarity.

What is the TFT_eSPI library?
For Microcontrollers:
This is a popular, high-performance graphics library designed for 32-bit microcontrollers like ESP8266 and ESP32.

Fast Graphics:
The library is known for its speed, offering significantly faster rendering performance compared to generic Arduino graphics libraries.

Configuration:
It requires configuration through user-defined setup files (e.g., User_Setup.h in the Arduino IDE) to specify the display controller, SPI frequency, and pin definitions for the specific microcontroller and display being used.

Examples and Applications:
The library includes numerous examples for various functions, such as displaying text, shapes, and animated GIFs, making it easy to create graphical user interfaces on small TFT screens.

How do they work together?
1. Connect the Screen:
A TFT display is physically connected to a microcontroller (like an ESP32) using communication protocols like SPI.

2. Configure the Library:
The user modifies the User_Setup.h file within the TFT_eSPI library to match the display's driver chip (e.g., ILI9341), pin connections, and other settings.

3. Write Code:
The user writes an Arduino sketch to control the display, using functions from the TFT_eSPI library to initialize the display, fill screens with colors, draw text, or display complex graphics.

In essence, a "TFT eSPI screen" refers to a TFT display being driven by a microcontroller using the fast and efficient TFT_eSPI library.

EEZ Studio is a free, open-source, cross-platform visual development environment for creating embedded and desktop GUIs with low-code/no-code features like drag-and-drop design and flow-based programming (EEZ Flow), plus powerful test & measurement (T&M) automation for devices using SCPI, supporting libraries like LVGL, and generating C/C++ code for hardware like Renesas MCUs, ESP32, and Arduino.

Key Features
Visual UI Design: Intuitive drag-and-drop interface to build GUIs with widgets, styles, and layouts.
EEZ Flow: A visual, no-code tool to create complex logic and automate T&M workflows.
T&M Automation: Control instruments (Keysight, Rigol, etc.) via SCPI, automate testing, and collect data.

Code Generation: Generates C/C++ code using libraries like LVGL, easily exportable for hardware integration.

Cross-Platform: Runs on Windows, macOS, and Linux.
Open Source: Free to use and encourages community contributions.
Project Templates: Ready-to-use examples for rapid prototyping.

How it Works
Design: Visually create your interface with drag-and-drop widgets (buttons, sliders, charts).
Logic: Use EEZ Flow to define interactions, state changes, and automation sequences without coding.

Automate: Connect to T&M equipment (like EEZ BB3), set up tests, and collect data.
Generate & Deploy: Export the designed UI and logic as C/C++ code to integrate into your embedded project.

Who Uses It?
Developers building rich UIs for embedded systems (Raspberry Pi, Arduino, MCUs).
Engineers automating test and measurement setups.

Hobbyists and professionals seeking a fast, visual alternative to traditional coding for UI and automation.

Part 3 of this video series has just been upload on 28 Dec 2025    • How to in EEZ Studio Change colour of butt...  

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