miniDenko

Details

## Features

Edit & save your message and show it up instantly.(Sub-second booting)
- Also supports Japanese characters thanks to [Arduino-misakiUTF16](https://github.com/Tamakichi/Arduino-misakiUTF16) lib written by [[Tamakichi]](https://github.com/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](#BOM))
Its [portable and slim shape](./openscad/minidenko-case-body-opaque.stl) fits in your (large) pocket.

LED Matrix + esp8266 + MPU6050 + Modern Web framework(Vue.js + Buefy) = A hackable LED messaging platform
And as a latest gadget should be, equipped with the **Type-C** charging port.

Files

minidenko-gerber-190929.zip

Zip Archive - 78.14 kB - 10/13/2019 at 05:54

Download

minidenko-case-backpanel-a.stl

stl-binary - 498.70 kB - 09/25/2019 at 15:25

Download

minidenko-case-body-opaque.stl

For opaque filaments

stl-binary - 282.49 kB - 09/25/2019 at 15:25

Download

minidenko-case-body-transparent.stl

For semi-transparent filaments

stl-binary - 279.19 kB - 09/25/2019 at 15:25

Download

minidenko-port-holder.stl

stl-binary - 58.24 kB - 09/25/2019 at 15:25

Download

Components

1 × ESP-12F (ESP8266 module)

1 × 8x32 LED Matrix board (MAX7219)

1 × 3.3V LDO xc6206p332mr (SOT-23)

2 × M2 x 6mm self tapping screw

1 × SPDT rocker switch (10x15 mm)

Project Logs

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Update: KiCAD project files & BOM have been pushed to GitHub

likeablob • 09/26/2019 at 15:40 • 0 comments

Finally pushed KiCAD files & garber & BOM to GitHub.

Since the project contains just 2 footprint files as the external dependencies, I decided to copy the files directly in the repo. Using git-submodule might be a better way to manage if there are several dependencies.

If you know how to specify a version (by Commit Hash, tag, or branch, etc.) in KiCAD Library manager, Plz let me know.

Just for future reference:

.gitignore for KiCAD projects : https://github.com/github/gitignore/blob/master/KiCad.gitignore
Renaming tool for KiCAD project : https://github.com/bobc/KiRename

Build Instructions

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1
(Order PCB)
ZIp the gerber folder and order PCB from a online PCB fabrication services (e.g. Elecrow, FusionPCB, etc.)
- No. of layers: 2
- PCB DImentions: 28x56mm
- PCB Thickness: 1.0mm
- PCB Color: Choose as you like
Shipping fees may vary depends on where you live, of course. However the cost for PCB itself might not exceed 10 USD for 10 PCBs.
2
Switch on your soldering iron, it's time to...
All the parts (except screws, some SMD parts, wires)
R3: 33k
R1, R2, R4, R5: 10k
- U1: xc6206p332mr
- C1: 1uF
- U2: ESP-12F
- Push down the plastic part on the 2.54mm 1 x 8 pin header to not stick out from the back side of the PCB.
- J5: GY-521
- Pay extra attention to the terminals of the LiPo battery when you cut it. Don't short circuit it!
- Let's burn the firmware to ESP.
  Refer to https://github.com/likeablob/miniDenko/tree/master/pio
  Connect your USB-UART converter to the board as follows.
- J2 Pin definitiion
- V: 5V(LDO_IN)
  R: ESP_RESET: RST pin:
  B: ESP_BOOT: GPIO0 pin:
  G: GND
  T: ESP_TXD: TX pin:
  R: ESP_RXD: RX pin:
- Detach the LED Matrix from the board, and cut the L-type pin header by a nipper.
- FIx the battery and the LiPo charing board to the LED matrix by using a piece of double sided tape.
- Screw the holder (`minidenko-port-holder.stl`) from the reverse side of the LED matrix board.
  M2 x 6mm Self-tapping screw x 2
- Put the LED matrix back to the board.
- Then, Let's put it in the case.
  minidenko-case-body-opaque.stl for opaque filaments
  minidenko-case-body-transparent.stl for transparent filaments
  https://github.com/likeablob/miniDenko/tree/master/openscad
- Screw the lid by using 4 screws
  M1.2 x 5mm Self tapping screw x 4
  minidenko-case-backpanel-a.stl
  https://github.com/likeablob/miniDenko/tree/master/openscad
- Power on and let's see how it works!
3
Connect your device with miniDenko
WIP
- Scan and connect to the AP named "miniDenko-xxxxx"(here xxxxx is a unique chip ID)
- Open http://192.168.1.5/ in a browser (Chrome recommended)
- Here you can edit & submit new messages ( Try to tap the "Add" button)
- miniDenko internally has 3 "slots" for preserving messages. You can "tap" the device to switch the messages.
# To connect your miniDenko to another AP
- Tap ⚙️ and go to the setting tab
- Tap "Config" button next to "WiFi AP (Client)"
- Input your AP's credentials and tap "Save"
- Then you have to change the WiFI mode to "AP+STA",
- Tap "Config" button next to "WiFi Mode"
- Reboot your miniDenko to apply the settings.
  You can see miniDenko's IP at the "IP(Client)" badge.