Blinking LEDs are good. Moving, spinning things are good too. Put them both together and you get a Persistence of Vision (POV) display. Hackers have been building these displays for years. This week's Hacklet focuses on some of the best LED POV displays...
I have finally implemented the connection's persistence along with the timeout mechanism !I'm also including the basic features of the HTTaP protocol, which I test using telnet:The first request is the typical "GET /?" command, which returns the JSON-formatted...
For most of the last 9 months, I've successfully avoided unplugging this clock. It's something I've specifically avoided as every power cycle requires pulling the clock off the wall, holding the timezone button for 5 seconds and then remounting...
I was inspired by the Persistence Of Vision badge hacks at the Hackaday super-conference. So I made a board that re-arrranges the Tiny Blinky circuit as a sort of "propellor" of sorts. You screw the board to a dowel and twirl it between your palms and...
POV displays are usually made from a pcb that have multiple Leds on it and that is connected to the shaft of a motor that rotates 360 degrees. The challenging part of this is to pass power and control signals to the rotating PCB. This is usually done...
All parts and PCB's have been ordered. I'll be assembling boards soon. I'd like to develop an open source web based interface for controlling LED strips, and I'm looking for contributors. The web UI is for non-coders who want a higher...
I've received a sample for the PDLC film I mentioned in my last post. While the film works well, I started having concerns about the circuitry and power requirements for a matrix based on this film. I think I'd have to build a significant amount of supporting...
Here is a picture of Tiny302 posted earlier with the addition of a seven-segment/LED/switch display. The display is compatible with the simulated hardware display in Sim68K so the software that runs in simulation will run on this hardware. It is a memory-map...
Video testing would never be complete until a CRT was put into the mix. This whole exercise started with the assumption that LCDs would handle arbitrary video timing. How hard is it to do a simple linear interpolation and resample at the native resolution...
I've been pondering a second version of the staff for a while now and what with burning man 2014 right around the corner I think it's time to get serious.I'll document the whole process start to finish here. Hopefully with any luck and a bunch of help...
Okiday, Futaba 20-SD-06GK VFD on the workbench with the filament heated. Fiftynine pins and no datasheet. The two outermost pins on each side were for the filament. The tube has 20 grid segments (one for each character) and 35 anode segments (5x7 phosphor...
The driver should have SPI or I²C interface and allow dimming. SPI MAX7219 : LCSC.com : €2.07 (Digikey >€7)has an internal 8x8bit RAM buffer74HC595 + 74HC138: 8 outputs, cheap, standard part, PWM-dimming using /OE-pin, Digikey...
Persistence-of-vision displays are fascinating. They can create text and images out of thin air, and the hardware can be quite small compared to the size of the display if user-generated motion is used to create the 'scan' dimension. I think POV displays...
Light Bar Above Main ScreenFor this bar graph I'm currently using 12 - 2x5mm rectangular LED's (I used Red/Green LED's that have 3 leads - common cathode, 2 anodes 1 for each color). I was thinking to make a more graded display (2 levels for each LED...
FIRMWARE: Each character to be displayed is stored as 8 bytes in the program memory of ATMEGA. For example char 'A' is stored in 8 bytes as:0b00001110, 0b00010001, 0b00010001, 0b00010001, 0b00011111, 0b00010001, 0b00010001, 0b00010001 You can see the...