ledbred

Led·Bred

Bill of Materials

• 1x Arduino Mega 2560 R3 or compatible clone
• 1x Screw Terminal Shield
• 1x MicroSD Shield
• 3x 32x8 NeoPixel RGB LED Matrix (no longer stocked by Adafruit but clones can be found easily)
• 1x Breadboard-Friendly NeoPixel RGB LED
• 1x Rotary Encoder with Pushbutton
• 1x Monochrome 128x32 SPI OLED Display
• 1x HB15CKW01-5F-FB Illuminated Pushbutton
• 1x TEPT4400 Photodiode
• 1x Lamping Tool (highly recommended)
• 1x 1MΩ Through-Hole Resistor

Construction Diagram

Constructing the pen

1. Use the lamping tool to replace the LED in the illuminated pushbutton with the TEPT4400 photodiode.
2. Blacken the side of the illuminated pushbutton's cap with a Sharpie. (This keeps out ambient light to improve detection.)
3. Install the illuminated pushbutton in the light pen top cap (pencap1.stl).
4. Feed the light pen cable through the light pen bottom cap (pencap2.stl).
5. Feed the light pen cable through the light pen barrel (penbarrel.stl).
6. Solder the wires of the light pen cable to the pins of the illuminated pushbutton.
7. Push the end caps into the barrel.

Wiring Diagram

Wiring Connections

• Rotary encoder left pin to Arduino D2
• Rotary encoder center pin to GND
• Rotary encoder right pin to Arduino D3
• Rotary encoder switch pin 1 to Arduino D4
• Rotary encoder switch pin 2 to GND
• Illuminated pushbutton switch pin 1 to Arduino D5
• Illuminated pushbutton switch pin 2 to GND
• Top RGB LED matrix DATA IN to Arduino D6
• Center RGB LED matrix DATA IN to Arduino D7
• Bottom RGB LED matrix DATA IN to Arduino D8
• Individual RGB LED DATA IN to Arduino D9
• OLED DATA/MOSI to Arduino D11
• OLED CLK/SCK to Arduino D13
• OLED CS to Arduino A3
• OLED D/C to Arduino A2
• OLED RST to Arduino A1
• Illuminated pushbutton LED anode to Arduino A0
• Illuminated pushbutton LED anode to 1MΩ resistor
• 1MΩ resistor to VCC
• Illuminated pushbutton LED cathode to GND