The $1 POV display spins around
You don't need much to make a view persistence display. A few LEDs and a processor are enough. [B45i] created a simple PC board with five LEDs and an ATtiny processor. There is a battery and it connects to a fan to spin.
Although the project is quite simple, we liked two aspects of it. First, it provides very detailed explanations on how to use an Arduino to program the Tiny using the Arduino IDE.
The other cool thing is the two web apps that can easily create data tables for POV viewing. Reviewing the code is also instructive, due to the use of binary encoding and enumerations to save space.
The downside, however, is that you have to adjust the delay to match the fan or whatever rotating element you're attaching to. It would be a big improvement to read an accelerometer and adjust the speed on the fly. This would, however, increase the costs a bit. You would also need a clever way to drive the LEDs, as you would lose at least one pin from the accelerometer.
You can of course create much more sophisticated POV setups. You can even do it with an FPGA.
You don't need much to make a view persistence display. A few LEDs and a processor are enough. [B45i] created a simple PC board with five LEDs and an ATtiny processor. There is a battery and it connects to a fan to spin.
Although the project is quite simple, we liked two aspects of it. First, it provides very detailed explanations on how to use an Arduino to program the Tiny using the Arduino IDE.
The other cool thing is the two web apps that can easily create data tables for POV viewing. Reviewing the code is also instructive, due to the use of binary encoding and enumerations to save space.
The downside, however, is that you have to adjust the delay to match the fan or whatever rotating element you're attaching to. It would be a big improvement to read an accelerometer and adjust the speed on the fly. This would, however, increase the costs a bit. You would also need a clever way to drive the LEDs, as you would lose at least one pin from the accelerometer.
You can of course create much more sophisticated POV setups. You can even do it with an FPGA.
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