Pyro Propeller Clock POV Circuit


Posted on Feb 5, 2014

The Pyro Propeller Clock POV schematic is actually not very difficult. There are three main parts: the power supply which uses a 7805, the LED output control which uses the PIC18F252 and 74LS373 and the `home` trigger circuit which uses an IR emitter and Phototransistor. This standard +5v power regulation circuit makes use of the LM7805 3-pin T2


Pyro Propeller Clock POV Circuit
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20 device. A DC filtering capacitor is attached to its output to prevent high frequency spikes from the power supply. The PIC 18F252 uses an 8-bit data bus system with 2 control lines to tell which 74LS373 latch to output data on the bus to turn on/off LEDs. With this design, we can only send data to one 74LS373 at a time, which just means LED output updates will be nearly simultaneous instead of 100% simultaneous. In order to know when the system should restart displaying the current image on the propeller clock, we need a known reference point called `home`. An IR emitter diode shines bright into a phototransistor. This turns the transistor `On` connecting the +5v collector pin to the +0v Emitter pin. The PIC 18F252 will see this `falling edge` transition and know right away it`s back at the home location, 360 °.




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