I just posted a new PCB design for the ESP32 Morse Tutor.? ?The code and the circuitry are the same, but this board has a few advantages over the original one:
1.? The board is smaller.? Since the size is less than 10 x 10 cm, JLCPCB and other companies will give you five boards for $2?+ shipping.? Yes, 40 cents per board.
2.? The board supports larger displays.? ?The 2.2" display is crisp and bright on the original board, but I find that the 3.2" board is easier?on my older eyes.
3.? There are more power supply options.? ?Micro-USB and battery inputs are now available in addition to the DC barrel jack input.
Here are a few links:
Short video showing new and original pcb at:??
Battery operation with new pcb:?
Builder's guide:??
Gerbers:??
Source code:?
Project introduction (STM32-based, but still apply):??
Bruce Hall