This was a fun project. I wanted to build an 8 x 8 matrix LED name tag that I could control with my smart phone. It was to display my name, title, company and business interests all in scrolling text.
The project uses an Esp-01, Adafruit I2C backpack with 8X8 matrix LED and a 3.7 volt lithium ion battery. The code is written in C/C++ using the Arduino development environment and it’s pretty straightforward. The processor acts as a Wi-Fi access point and simple HTTP requests control the output to the 8X8 matrix LED.