miniDenko - A portable messaging device

miniDenko (Denko = 電光 is from "an electric scoreboard" in Japanese) is a portable messaging device.

Or LED Matrix + ESP8266 + MPU6050 + Modern Web framework(Vue.js + Buefy) = A hackable LED messaging platform

Features

• Edit & save your message and show it up instantly.(Sub-second booting)

  • Also supports Japanese characters thanks to Arduino-misakiUTF16 lib written by [Tamakichi] san.

• Easily connectable with Phones, Laptops, etc. via WiFi.

  • Supports STA, AP, AP_STA modes to collaborate with the devices.

• Made from easily-obtainable parts. (See #BOM)

• Its portable and slim shape fits in your (large) pocket.

• And as a latest gadget should be, equipped with the Type-C charging port.

Project structure

• pio/ - code for the firmware(PlatformIO)
• pio/webui/ - code for the WebUI(Vue.js + Buefy)
• kicad/ - PCB design (KiCad)
• gerber/ - PCB gerber files (KiCad)
• openscad/ - models for the 3D-printable case. (OpenSCAD)

Gallery

	Descriptions
	Front view
	Side view (Charging port)
	Side view (Power SW)
	PCB
	Web UI

BOM

Name	Quantity	Descriptions
ESP-12F (ESP8266 module)	1
32x8 LED matrix module (MAX7219)	1
GY-521 (MPU6050 module)	1	8 pins
350mAh LiPo battery	1	19x36x8.5 mm
Type-C LiPo charging board (TP4056)	1	28x17.3 mm
10k ohm resistor (0805_2012Metric)	4
33k ohm resistor (0805_2012Metric)	1
1uF ceramic capacitor (0805_2012Metric)	1
3.3V LDO xc6206p332mr (SOT-23)	1
SPDT rocker switch (10x15 mm)	1
M1.2 x 5 mm self tapping screw	4
M2 x 6 mm self tapping screw	2

Build instructions

https://hackaday.io/project/167747/instructions

Refs

• https://www.thingiverse.com/thing:3876563
• https://hackaday.io/project/167747-minidenko

License

MIT