Stock Market Ticker Display on LILYGO T-Dongle S3
A real-time stock market display for the LILYGO T-Dongle S3's 0.96" screen, showing S&P 500, NASDAQ 100, and 10-year T-Bill values and daily percentage changes pulled from Yahoo Finance over WiFi.
Overview
This project uses the LILYGO T-Dongle S3 as a compact, always-on financial ticker. The tiny 0.96" display cycles between the current market value and the daily percentage change for three key indices: S&P 500 (SPX), NASDAQ 100 (NDX), and the 10-Year T-Bill (T10). Data is fetched live from Yahoo Finance whenever the board has internet access.
Setup
On first boot, the T-Dongle S3 creates a WiFi access point named "T-Dongle-S3". Connect to this AP and open http://192.168.4.1 to enter your home network credentials. These are stored persistently so subsequent boots connect automatically. Once online, the ticker starts cycling data on the display.
Technical Details
The firmware is built with PlatformIO and the ESP-IDF extension for VS Code. It uses the ESP32-S3's WiFi stack and the ESP_WifiManager library for captive-portal credential management. The display driver targets the T-Dongle S3's 0.96" color screen. The project is well-documented and serves as a clean example of WiFi-connected data display on LILYGO's USB dongle form-factor hardware.
