Rotating Blue LED Display

29

 

Thanks to Csaba for sending in this very nice looking display. The frosted blue LEDs have a great effect!

Project code (zip).

"Motor
An old tape recorder motor. With this load it can rotate about 7.4/s. The image is flashing, it should rotate about 25/s. For supply a 7809 IC is used.

Supply of the rotor
The commutator of another similar motor is used (crw_1511) and a 3 phase rectifier with a big capacitor (crw_1510). For supply a 7806 IC is used shifted with a diode, so the supply voltage for the uper part is 6.7V. The rectifier voltage (1.2V) is subtracted from it.

LED
8 pieces of 5mm 3000mcd blue leds. The body is made to be diffuse by sandpaper, so the viewing angle is much larger. The bottom is painted black, so there are no additional light spots.

Control
PIC 16F84 microcontroller @20MHz.

Edit
The displayed picture can be edited in Excel pixel by pixel. The Excel table is divided to character spaces (5×8 + 1 column spacing) but any graphics can be displayed. 100 columns are displayed, but 250 can be edited. If the jumper is on, than the first 100 column will be visible and not moving. If the jumper is off than the 250 columns will slowly be shifted through the displayed area.

The output of the Excel sheet should be copied into "data.inc" and the software must be rebuilt and downloaded.

Schematic
The LEDs are driven through a 100 ohm resistor directly and the supply can be turned on/off by a FET. An optical sensor is used to get position info. (Dismounted from an old floppy drive.)"

 

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29 Comments



  2. hi how can view the circuits on this project/


  3. Nice Finish! Great work.

    joe:
    It is very similar to the classic “Bob Blick Propellor clock”.
    http://www.bobblick.com/techref/projects/propclock/propclock.html
    It even uses the same chip, so the schematics are going to be very very similar. There are hundreds of projects like this one, but this is a good starting point.
    Let’s hope that more information goes up on this one.

    I might see if I can get around to finishing my crazy prop scroller. So far it has 32 tri color SMT Leds in a strip, and derives power like an electric toothbrush does, induction. Oh, and you can load new videos into it over USB.


  5. ima li neko elektricnu semu za ovaj projekat


  6. hi how can view the circuits on this project


  7. Hi misasd,

    If you need more information than what is in the project zip listed in the article you will need to contact the project creator (also linked to in the article).






  12. Hi!
    very nice job!
    there is a way to get the schematic for this circuit?
    and how did you sync the PIC whit the rotation frequency?


  13. Hi I like to make this for first time but i could not found circuits daigram.Please mail me for circuits and software.


  14. hi from germany,
    how can I find the schematic on this project and or this on version 2 ?

    ;=)

    grelli


  15. I take a great interest in such ideas, me very much interests, synchronisation automatic or hand-held?


  16. Hello Alan. It’s very interesting project for me. Please mail me the circuits if it’s possible.


  17. Hello Alan. It’s very interesting project for me. Please mail me the circuits if it possible. Sorry i write a wrong mail address.


  18. The circuit has been added (last image in the article). Big thanks to Csaba for sending it in.

Comments are closed.