Author: Sysop

Coding a Touchscreen Menu

Here is a practical application example for the Touchscreen PCB. First, a couple of caveats: Arduino code for Touch Menu

A Tale of two Screens

At first I thought I had been sent a batch of faulty ILI9341 displays. They looked identical to the pile of others I’ve been using, but on first use were only writing to the top 2/3rds of the screen. These are 2.4inch displays that feature SDCard, touch interface and have given me great service. At… Continue reading A Tale of two Screens

PCB for ESP32 Touchscreen

Printed Circuit board for ESP32 with Touchscreen This is the next logical step after the “older and solder” touchscreens I have been using for years. ESP32 is a logical upgrade: more power, more GPIO and much simpler HTTPS capabilities. Furthermore several libraries have better versions. PCB production Everyone likes soldering, but a few of these… Continue reading PCB for ESP32 Touchscreen

WT32 Touchscreen

Another interesting board which appears to suffer from poor documentation.No problem driving the graphics with TFT_eSPI and others, but the touchscreen proved elusive. In this example, I have had great results with the LovyanGFX library. This library supports the touchscreen, standard graphics calls for text and shapes, but the important (in my view) capability of… Continue reading WT32 Touchscreen

Graphing with ESP32 S2 and T-Display (update)

These devices are able to display a useful graph. Not accurate enough for measurements but good to see trends. In my case I use it to display various data trends from the household solar installation: PV output, Household usage, Feed-in, Battery state and so on. The attached code is very straightforward.The process involves: The DataAny… Continue reading Graphing with ESP32 S2 and T-Display (update)

ESP32 S2 with ST7789 – jpg

The next challenge for these little powerhouses was to be able to use Bodmer’s brilliant TFT_eSPI library to see what the graphics capabilities might be. Just recently the libraries have been updated to include the S2 chipsets, and they appear to work very well. In fact the only reason for writing this post is to… Continue reading ESP32 S2 with ST7789 – jpg

EPD47 Practical issues

The EPD47 is an ePaper equipped ESP32 microcontroller board from Lilygo, featuring Wifi and Battery management. In practical terms, getting these to work presents no significant challenges. Thankfully the board is equipped with USB-C connector which performs well and feels better to use than the flimsy USB-micros. This post is to offer a few simple… Continue reading EPD47 Practical issues