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ATtiny85SwingPOV

Movie

This is a POV (persistence of vision) display by human-powered swinging.

Click to expand

3 demonstrations are available and it's changed by pressing the button.

  • Message mode: display the letters "ATtiny85SwingPOV" with scrolling.
  • Counter mode: display the number of how many time it's swinged.
  • Graphic mode: various colored OBONOs move up repeatedly.

Hardware

Components

  • ATtiny85
  • Optical tilt sensor: RBS32
  • NeoPixel Stick (WS2812 × 8)
  • Resistors: 220Ω and 15kΩ
  • Wires, connectors, a button, a switch, etc...

Schematic

Schematic

Example

Click to expand Click to expand Click to expand

Software

Build environment

Install ATTinyCore boards to the Arduino IDE and configure the settings as follows.

Attribute Value
Board ATtiny25/45/85 (No bootloader)
Chip ATtiny85
Clock Source 8 MHz (Internal)
Timer 1 Clock CPU (CPU frequency)
LTO (1.6.11+ only) Enabled
millis()/micros() Enabled
Save EEPROM EEPROM not retained
B.O.D. Level B.O.D. Disabled (saves power)

This sketch depends on following library. (You can add this by library manager)

Also, you should modify "SwingPov.cpp" depending on your hardware.

  • SWING_TIME_MIN and SWING_TIME_MAX: The threshold of each swing time in msec.
  • SWING_PHASE_ADJUST: The delay to toggle the direction after sensing tilt change by the percentage of each swing time.

License

These codes are licensed under MIT License.