An Analog & Digital propeller clock
It isnt Real its just because your so awfully slow!!! ;-)
based on an afterimage phenomenon, ie the reaction slowness of the retina, the illusion of reality our brains are "lying"
Picture's made 12-12-1997 by Luberth Dijkman Clock was actually
2 weeks earlyer
Bob Blick started the propeller clock
This clock is based on Don Zehnder's Clock. He made the first
version (+/- 1996)
Above Don Zehnder's first analog version
I saw his analog version and asked if i could have his code
and i build my version with a bit more LED's to circle center and an outher circle LED in 1997
Simple slip spring ring to get power on rotating propeller
Some technical information!
Assembler Code written by Don
This clock has 14 red led's & 1 Green
(red diffused 200 to 300 Mcd Kingbright L-53-SRD-D)
I prefer difused LEDs as they are better vissible from the side(angle)
Bright LEDs are perfect only when you look/stand straight in front
Tommorow (13-12-'97)i wil try red diffused 700 to 1000 Mcd Kingbright
Nowadays(2002)a large choice, back
in 1997 it was a bit harder to get ultra bright led's
The propeller is mounted on a "Mecano"(Kid's metal construction) base
7 outher led's are controlled direct from pic's port
8 inner led's are together switched by a transistor
The moter comes out a Philips VCR VR 2022 two of them in 1 recorder
A 4mhz pic16c84 is clocked at 10 mhz
Later i made a brush/slipring the balbearing give too much errors
Rotation pulse is given by infrared gate
Time setting is done with a reed switch (when a magnet apears near
propellor time speeds up)
Luberth Dijkman Andijk Holland 12-12-1997
Next ASM code's must be changed for use with Bob's flat clock layout
Pay attention Pic running @ 10Mhz And include's p16f84.inc
Fan spins your name in lights
Computex 2006 Cheap glory
By Simon Burns in Taiwan: Thursday 08 June 2006, 10:28
FANS WHICH use rapidly rotating LEDs to display text have been around for a while. But so far, they've been limited to a word or two pre-programmed into them by the manufacturer, plus a temperature display. By next year, you could be seeing your own name in those rotating lights.
Taiwan-based Polo Tech, which claims a patent on rotating LED fan display technology, has plans for a USB-programmable model, although the release date is undecided, company representative Alice Wang said at Computex in Taipei. Users will be able to use an internal USB connection and software to change the fan display in real time to show their name, or any other text or simple graphics.
At the moment, Wang said, changing the text requires a whole new IC, so is only feasible for large quantity orders.
The fans generate the display with a rotating stick of circuit board with a vertical line of LEDs on it. This is mounted on the fan's axis, and spins as the fan spins. Polo Tech's driver IC can also handle simple animation, and even colour changes, given suitable LEDs. The IC also handles the precise timing calculations required to keep the display steady.
Your name up in lights. Coo.
To avoid excessive flicker, the rotation speed needs to stay above 2000 RPM, Wang said. The display remained visible even in the bright interior lighting of the Computex hall.
At Computex, the company displayed its original $7 medium sized fan – which appears to have been taken up by companies including Thermaltake and Foxconn – as well as a larger prototype (see photo)
(That is where i work as a mechanic problem solver trying to keep
Another Clock the first one i made, other wxs web page is dead
Mechanically Scanned LED Clock
my version off the clock made in 1997 well before all the commercial items availeble today
saw Bob Blicks clock web page in 1996/1997
thougt it would be much to complicated to build for my lower technical school brain
but the teacher Bob had it well described on his webpage
so i gave it a try and stunning miracelous it worked
Hey, I took the liberty of changing your progam so that it will write
the hex values to a file for you. It gives you a few options. You
can write to a different file. or you can keep on writing to the same
file. It wasnt much of an update, but its kind of nice since you can
just copy it as is into your asm code. OK, well, here's the program.
Change it as you will to be better suited to people or if you want to
clean up the code a bit, since it has your name on it. OK, take care.
I have constructed a 'magic wand'
which will display a message in mid air when waved in front of you.
The wand is not very easy to see in daylight, but many people can see
I have constructed this with little components so it is very cheap.
NOTE: MCLR Pin5 should be connected to +vdc (+5v DC)
I made my wand out of a maplin project box order no FT32J
This is a small probe box and cost approximately 1GBP.
I drilled 5 holes for the LED's and made a small PCB to fit inside.
The box is *Just* big enough to squeese a 9V battery in, which supplies
the PCB with the power.
The scrolling sensing is done by a tilt switch/ push button.
If a tilt switch is used, you will have to juggle with it for optimal
In place of the tilt switch, you could put a button mounted on the
case, which when pressed will triggger off the display.
The project is fairly simple, the only problem being that all of the
has to cram into a relatively small box. Follow
the steps below, and the scroller will work.
1) Get all of the components (see below)
2) Assemble the components on a PCB or Veroboard.
Use the circuit diagram to build it.
.... 2.1) Place the smallest pieces on the board first.
Do it in height order. i.e links first then resistors caps... Put the
microchip in first.
.... 2.2) Program the microcontroller with the message.asm file.
.... 2.3) Place the programmed chip into the board.
The chip should be set to Watch Dog Timer off (WDT) and oscillator mode
You can download pictures of the Simple PIC programmer from my web site
3) Drill all of the holes in the box.
The holes should be:
5x LED hole
1x button hole(optional)
1x off switch
4) Push the PCB into the box, with the LED's pushed into the holes
Attach the PCB to the bottom of the box
with either tape/velcro or PCB spacers depending
on the height of the LEDS from the bottom of box.
5) Put battery in box making sure that it is held in tightly.
6) Put the top onto the box. Turn on and wave around
R1 100K Metal film 0.5%
C1 100n Ceramic cap
C2 100n Ceramic cap
C3 100uF Electrolytic
C4 10pF Ceramic cap
IC1 PIC16C84 04 (4Mhz)
IC2 LM7805 voltage regulator
5x Red LED
1x push to make switch
1x toggle/slide switch
The software is very simple indeed. the are mainly four parts to my
1) The declarations
2) The message to be scrolled
3) The letter output routines
4) The wait routine
My Daewoo (Nexia) car wheel is 57CM in diameter ;-)
60Km/H = 1000M/Min / (3.14 x 0.57M)= 558,72 rotations per minute at
thats 559rot/min /60seconds = 9.3 displays per second(what does youre
telivision do?(something like 30 pictures per second))
should give a visible display => but not optimal
but what if you put leds on 2 or 4 sides
this should give a good display
laser beam laser pointer.
The device uses one light source (a laser beam) and mirrors to scan the display surface.
The main components include: a laser diode from a keychain pointer,
a cassette player motor,
a PIC17F877 board with the associated circuitry,
a power supply, and an ingenious head with mirrors.
The head is an octagonal prism, with a small mirror on each lateral face.
Each mirror is mounted at a different angle,
giving different reflection angles for the laser beam.
The mirrors reflect the laser beam, creating a raster.
The raster is modulated by turning on/off the laser beam.
The microcontroller board receives one pulse per rotation from the rotational speed sensor
and calculates precisely the moment for turning on/off the beam.