Tiny DIY Persistence of Vision Project
Persistence of Vision (POV) devices display a message when you wave them through the air. We’ve seen a few POV projects in the past, but none quite this small. Switch off the lights and wave the device around and see the message displayed. The uPOV device is not only small but it uses an accelerometer to time the hand movement and the display of the message on the desired spot. The hardware has been kept as low cost as possible.
The system uses the Freescale MMA7660 3-axis digital low-g accelerometer which costs less than $1.50. The ATMEGA48A microcontroller and 8 2V LEDs are the other main components. Two timers (8-bit & 16-bit) time the oscillations and display of the message. The accelerometer detects orientation and automatically scrolls the message vertically. A CR2032 coin cell battery powers the device. All source files and schematics are available which can help you hit the ground running with the uPOV project.
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