ESPHomeMatrixLED VS blynk-library

This project seems to imply DejaVu Sans can be used on a 5-pixel-height display, although that's based on a very surface-level skim of the repo: https://github.com/rnauber/ESPHomeMatrixLED

I'd suggest that your best bet in general would be to look at any projects using these kinds of LED dot matrix marquee displays. I was able to find a lot of arduino tutorials with a google search, there's probably relevant code with some of those. Good luck!

https://blynk.io/ (you can find an example that uses their legacy API in one of my releases)

Like it says, to try and keep up with the changing well levels in the summer at my house, I put together a project to monitor well water levels and update a Blynk app.

From the source code found here: https://github.com/blynkkk/blynk-library/blob/master/src/Blynk/BlynkConsole.h

Check out Blynk: https://blynk.io

I have an Arduino Mega 2560 with an ESP8266 module connected to it via Serial1 as outlined in https://github.com/blynkkk/blynk-library/blob/master/examples/Boards_WiFi/ESP8266_Shield/ESP8266_Shield.ino - basically, this sketch works perfectly as is, but I have it personalized, of course.

That Blynk library sucks badly... it's obviously NOT written with ESP8266 in mind, simply grossly hacked from an Uno to sort-of-work. I see a few places in the header file alone where it can hang and cause a WDT, and the 'ping' that's printed is buried somewhere else in the library, undoubtedly another poorly-planned while() or if-else-hang.

Agreed about google and would add clarity. In the field of IT clarity is critical. If OP had said blynk.io, the .io would have clicked with me that it was a web site. Another guy just asked about PS/2 - I thought he meant the keyboard/mouse interface. Others twigged that he meant Playstation 2.