A simple badge PCP with 9x9 LEDs. Create symbols, figures, pixel art by just soldering LEDs to the spots you want. No programming needed.
| Designator | Package | Quantity | Designation |
|---|---|---|---|
| BT1 | 2-Pin connector | 1 | Battery-Holder (2xAAA) |
| C1, C2 | 100nF | 2 | |
| C3 | 0805 SMD capacitor | 1 | variable (see capaictor table) |
| D1-D81 | 0805 SMD LED | 1-81 | LED red, green, orange, ... |
| Q1-Q9 | Mosfet | 9 | 2N7002 |
| R1, R2 | 0805 SMD resistor | 2 | 100k |
| R3-R11 | 0805 SMD resistor | 9 | variable (see resistor table) |
| SW1 | SMD switch | 1 | |
| U1 | SOIC-8 NE555 | 1 | |
| U2 | SOP-16 CD4017 | 1 |
The frequency is determined by the value of C3. Always on: The frequency is so fast, it looks like all (soldered) LEDs are always on.
| Frequency | Capacitor Value (C3) |
|---|---|
| slow (~5Hz) | 1µF |
| faster (~50Hz) | 10nF |
| always on (~110Hz) | 4700pF / 4,7nF |
Resistor values depend on the number of soldered LEDs per row (refer to the table below). Note that you can only choose one LED color per row.
| Number of LEDs | Resistor value for red LEDs | Resistor value for green LEDs (bright!) |
|---|---|---|
| 1 | 56 Ohm | 110 Ohm |
| 2 | 27 Ohm | 56 Ohm |
| 3 | 18 Ohm | 36 Ohm |
| 4 | 15 Ohm | 30 Ohm |
| 5 | 11 Ohm | 22 Ohm |
| 6 | 9,1 Ohm | 18 Ohm |
| 7 | 8,2 Ohm | 16 Ohm |
| 8 | 6,8 Ohm | 13 Ohm |
| 9 | 6,2 Ohm | 12 Ohm |
TBD
Some $humans did an amazing job. Here are some awesome examples:
- PCB layout: CC-BY-SA 4.0 - Thomas Schmid and Timo Schindler
- Manual (TeX): LPPL - Marei Peischl
- Manual (pdf): CC-BY-SA 4.0 - Binary Kitchen e.V.
A big thank you goes to Thomas Schmid, Clemens Grünewald and Sandra Schweighart for all the help!
The calculation of the frequency done with https://ohmslawcalculator.com/555-astable-calculator
The Logos to the PCB are created with an Inkscape plugin
- download and install https://github.com/badgeek/svg2shenzhen
- Inkscape: Extensions -> svg2shenzhen -> Prepare Document
- Choose Layer where to place the logo
- Rename: remove "disabled" from layer-name
- Place logo
- Extensions -> svg2shenshen -> Export Kicad (Kicad-module)
- Copy .kicad_mod in .pretty-folder
- Place as part