Hi,
I am working on a university project, building an LED display to demostrate the relatively small amount of data the human brain requires in order to understand a moving image. I have made a small mock up using teensy and understand the basic opperations, but now wish to play the video from an SD card rather than teensy. I have purchased the following items:
Teensy 3.1
Octows2811
Wiz820 SD
Double insulator pins (longer than normal with an extra spacer)
WS2812 30/m LEDS
5v 30A PSU
2x small 5v fans to cool the psu
I understand that I solder the teensy, octo and wiz820 together in a stack on the longer pins, and that some pins need to be cut or shorted as desribed here:
"Not visible in the photo above is special wiring for the Micro SD card CS signal. Pin 4 is cut between the Teensy and WIZ820+SD, and between the WIZ820+SD and Octo board, pins 3 and 4 are shorted together. This routes the SD card's CS signal to pin 3. Pin 4, the default wiring for the WIZ820+SD adaptor, can't be used because pin 4 it's reserved by OctoWS2811"
From the picture in the software files this is clearer but this doesnt mention the pin out to the octo being cut?
Once assembled I then need to sort out the software - Movie2SDCard makes BIN files from my movie files - I then place this onto the root of the SD card and load Teensy with "VideoSDCard.ino" - will the video then autoplay? Will the video loop? The software is the bit that confuses me as I have no real programming knowledge
In terms of wiring I am using an arrary of 25pixels x 16 strips - is it better to use a smaller gauge cable directly to each strip or could I run two large power rails using heavy copper wire (+5v and GND) which are then connected to the pixel strips by much shorter cables? The piece is going into an exhibition space so I need to make it look as smart as possible while still retaining function, Originally I was going to mount the PSU to the rear of the assembly, but it has been decided that seeing the equipment driving this screen is of interest so it will be mounted adjacent in a small perspex box (vented and fan cooled)
I have so far been working with information from here:
http://community.arm.com/groups/embedded/blog/2014/05/23/led-video-panel-at-maker-faire-2014
https://forum.pjrc.com/threads/25588-OctoWS2811-flicker?p=47485&viewfull=1#post47485
https://github.com/PaulStoffregen/OctoWS2811
I am working on a university project, building an LED display to demostrate the relatively small amount of data the human brain requires in order to understand a moving image. I have made a small mock up using teensy and understand the basic opperations, but now wish to play the video from an SD card rather than teensy. I have purchased the following items:
Teensy 3.1
Octows2811
Wiz820 SD
Double insulator pins (longer than normal with an extra spacer)
WS2812 30/m LEDS
5v 30A PSU
2x small 5v fans to cool the psu
I understand that I solder the teensy, octo and wiz820 together in a stack on the longer pins, and that some pins need to be cut or shorted as desribed here:
"Not visible in the photo above is special wiring for the Micro SD card CS signal. Pin 4 is cut between the Teensy and WIZ820+SD, and between the WIZ820+SD and Octo board, pins 3 and 4 are shorted together. This routes the SD card's CS signal to pin 3. Pin 4, the default wiring for the WIZ820+SD adaptor, can't be used because pin 4 it's reserved by OctoWS2811"
From the picture in the software files this is clearer but this doesnt mention the pin out to the octo being cut?
Once assembled I then need to sort out the software - Movie2SDCard makes BIN files from my movie files - I then place this onto the root of the SD card and load Teensy with "VideoSDCard.ino" - will the video then autoplay? Will the video loop? The software is the bit that confuses me as I have no real programming knowledge
In terms of wiring I am using an arrary of 25pixels x 16 strips - is it better to use a smaller gauge cable directly to each strip or could I run two large power rails using heavy copper wire (+5v and GND) which are then connected to the pixel strips by much shorter cables? The piece is going into an exhibition space so I need to make it look as smart as possible while still retaining function, Originally I was going to mount the PSU to the rear of the assembly, but it has been decided that seeing the equipment driving this screen is of interest so it will be mounted adjacent in a small perspex box (vented and fan cooled)
I have so far been working with information from here:
http://community.arm.com/groups/embedded/blog/2014/05/23/led-video-panel-at-maker-faire-2014
https://forum.pjrc.com/threads/25588-OctoWS2811-flicker?p=47485&viewfull=1#post47485
https://github.com/PaulStoffregen/OctoWS2811