ESPlay Micro micro open source game handheld-personal refined version

This project is an open source mini game handheld machine made using Espressif Systems ESP32, which supports NES, GB, GBC, GameGear and other games.

The hardware design of this project comes from the esplay\_micro\_hardware of the master pebri86.

Project address: https://github.com/pebri86/esplay_micro_hardware

This project is modified twice from the LiiGuang project

Project address: https://oshwhub.com/LiiGuang/esplay-micro-V2

Thanks to the two guys for the design

2022-3-4

The verification has been successful. No more problems have been found so far. The junk capacitor I bought has whistling. I don’t know which problem it is.

Personal modification content:

The L key routing has been modified, but the hole is directly connected to the bottom layer. After the through hole is soldered, the L key cannot be used.

Optimized some wiring

Remove the J2 interface

Turn over the speaker interface, otherwise the speaker will not be plugged in or out because the switch is blocked.

Add four resistors to the speaker, and you can adjust the volume by soldering the resistors yourself (I personally think the volume is too high, so I connected resistors in series). I tried 27 ohms with 1% accuracy. The 50% volume is almost equal to the 6% volume without the resistors. There will be serious noise breakage, but there is still a bit of noise or breakage during normal playback. This needs to be solved. If you don’t want to connect them together, you can directly connect them with a piece of tin or a 0 ohm resistor.

Modify the position of the SD card resistor, otherwise the battery connector will be blocked by the SD card resistor when inserted and cannot be pulled out.

No modification to the schematic diagram, directly modified PCB