The removed sheet of cardboard served to give batteries some room and slip easily inside the tube. Wrap another sheet of cardboard and hold again with scotch tape. Project still in progress, I am still getting everything fine tuned/uploaded 3D Printed persistence of Vision clock. This model prints the time in the air while rotating real fast The 51515 POV clock uses only the middle row of the LED matrix on the hub. The battery holder can be made out of thin cardboard: cut a square of cardboard the size to make one round around the two batteries. Build a Persistence of Vision (POV) Clock with one kit of MINDSTORMS 51515. Connect battery holder un pushbuttons with thin plastic insulated wire. One resistor and capacitors can be soldered on the solder side. Start wiring with very thin enameled copper wire. Solder the crystal and the seven resistors. Do not mount the micro on the socket for now. Solder the socket in place, pay attention to position of pin no.1 (the one with the dot). Solder one pin per LED first, align them in a row, solder the other pin of each LED. Better mark a black spot on the side of the LED's case before you cut the wires to correct lenght. Solder at the top the seven LEDs, shorter pin is Cathode, the one that goes to ground. Now on with step two: construction This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 LicenseĬut a piece of perfboard in a shape suitable for the top of your toothbrush case. The voices in the background are my family's. The clicking noise is the 'wand!' button being clicked while swinging. The quality is not good being taken with a photographic camera. Make sure to check the video attached at the bottom. #PERSISTENCE OF VISION 3D CLOCK SOFTWARE#I successfully used PonyProg as programming software and its HW interfaces. This would probably deserve a whole instructable of itself. This way it can write any number or text in the air. It times precisely when the lights turn on. #PERSISTENCE OF VISION 3D CLOCK CODE#The source code is available for those wanting to do their own ports. #PERSISTENCE OF VISION 3D CLOCK FREE#There are many tecniques and sofware described over the net. Build a Persistence of Vision (POV) Clock with one kit of MINDSTORMS 51515. The Persistence of Vision Raytracer is a high-quality, Free Software tool for creating stunning three-dimensional graphics. #PERSISTENCE OF VISION 3D CLOCK HOW TO#I'd rather not delve into how to program the micro. Below the schematic, the source code commented so as to make it understandable as much as possible and the HEX file ready to burn into the PIC. The time is set with trials and errors: read the time, push minutes set button to meke them advance one minute per second, read time again. Synchronizing button push and wand swing may take time to learn, but not much. The circuit consumes very little power due to the low voltage supply and the low frequency crystal. The circuit is based on a PIC16F84 micro, a 32768 Hz crystal watch salvaged from a dead watch 8 resistors, two capacitors and two AA or AAA batteries. Difficult to explain, much easier and fun to try. Persistence of vision (POV) refers to the phenomenon of the human eye in which an afterimage exists for a brief time. Your eye's retinas will retain the image of each column one close to the other and the image of the clock will appear. The single column of LEDs shows one after the other the columns forming the digits of minutes and hours, right to left : pushing the trigger button starts the display of minutes, tens of minute, separating colons, hours and tens of hours, one column at a time rightmost column to leftmost column. At the top of the case 7 LEDs provide the display, at the middle two small button set the time and a larger one triggers the display: push the button (this turns the display on otherwise the display is normally off) and swing the wand right to left and the time of day will float midair ! How is this accomplished ? The display is virtual, being made of 25 columns of 7 LEDs each. This one comes in the shape of a tooth brush case (courtesy of Swissair, now gone) one must hold as a magic mand. Could someone guide me trough it Basically I have an Atmega328P with loaded bootloader in it, a DS1302 RTC module, 74HC595 shift register, a IR led and photodiode for interrupt, 8 leds. One lap is displayed in 20 divisions.This is a persistance of vision project of the kind we have seen lately in large quantities. Im making an pov clock, but as Im not very skilled in programming, I need your help. I used the following SPI input LED Dotstar library.
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