ATtiny85SwingPOV

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

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

Example

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)

• Adafruit NeoPixel

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.