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1  Using Arduino / LEDs and Multiplexing / Large LED Matrrix transfer protocol on: February 25, 2014, 07:10:42 am
I am looking to build a large RGB LED matrix composed of several 16x16 panels. Each panel will have an onboard controller and will multiplex with 3 TLC5940s. I have the basic hardware layout, but what would be the best way to transfer all the data between the main controller and the panels? I was thinking of a wired protocol but now I'm considering switching to Artnet so computer control is easier. Any ideas?
2  Using Arduino / LEDs and Multiplexing / Re: Cheap WS2811 LEDs on: September 03, 2013, 01:06:00 pm
And at some point it is a promise of that price as soon as I click the buy button...
3  Using Arduino / LEDs and Multiplexing / Re: Cheap WS2811 LEDs on: September 03, 2013, 01:05:04 pm
I'd definitely post something about them not honoring posted price. Don't think it'll matter or make a difference....but I'd do it anyway.

Yeah! Wreck their feedback because they made a genuine mistake then refused to let you rip them off.


I agree to a point, but if they dont lose something then what motivates them to be more careful next time?
4  Using Arduino / LEDs and Multiplexing / Re: Cheap WS2811 LEDs on: September 03, 2013, 09:02:46 am
Well crap
5  Using Arduino / LEDs and Multiplexing / Re: Cheap WS2811 LEDs on: September 02, 2013, 02:20:15 pm
Yea I just noticed the page went offline. I guess we'll see if the seller cancels the order or not
6  Using Arduino / LEDs and Multiplexing / Re: Cheap WS2811 LEDs on: September 02, 2013, 12:40:18 pm
Yea I got 10 lots just cause why not. We'll see what happens. I might have just scored 1000 leds for $6.10
7  Using Arduino / LEDs and Multiplexing / Cheap WS2811 LEDs on: September 02, 2013, 09:47:29 am
So I just found this..

.http://www.aliexpress.com/item/Free-shipping-100pcs-lot-5050-SMD-RGB-LED-with-built-in-WS2811-IC/1282890256.html

if this is off topic feel free to move it
8  Using Arduino / LEDs and Multiplexing / Re: Multi color access using 74595 on: May 28, 2013, 10:03:20 pm
I would look at ShiftPWM
9  Using Arduino / LEDs and Multiplexing / Re: SPI slave select + two shields on: March 06, 2013, 08:23:09 am
This is a guess,  but the display might need a constant stream of data,  and the rf24 library is stopping that from occuring for a brief amount of time 
10  Using Arduino / LEDs and Multiplexing / Re: SPI slave select + two shields on: March 05, 2013, 06:12:36 pm
You have to have rf24 and rf24network libraries installed.  You set pins when you create an instance of rf24
11  Using Arduino / Networking, Protocols, and Devices / Re: nRF24L01+ module on Arduino shield on: February 26, 2013, 09:03:10 pm
What library are you using?
12  Using Arduino / Networking, Protocols, and Devices / Re: RF24 Library: Driver for nRF24L01(+) 2.4GHz Wireless Transceiver on: February 25, 2013, 05:44:05 pm
Also I found a documentation error. The code and documentation do not line up for the setPALevel command
Quote
void RF24::setPALevel   (   rf24_pa_dbm_e    level   )   
Set Power Amplifier (PA) level to one of four levels.

Relative mnemonics have been used to allow for future PA level changes. According to 6.5 of the nRF24L01+ specification sheet, they translate to: RF24_PA_MIN=-18dBm, RF24_PA_LOW=-12dBm, RF24_PA_MED=-6dBM, and RF24_PA_HIGH=0dBm.

Parameters:
level   Desired PA level.

Code:
/**
 * Power Amplifier level.
 *
 * For use with setPALevel()
 */
typedef enum { RF24_PA_MIN = 0,RF24_PA_LOW, RF24_PA_HIGH, RF24_PA_MAX, RF24_PA_ERROR } rf24_pa_dbm_e ;

You use min,low,high,and max in code but docs say otherwise


And for those interested,  I am porting this library to energia (arduino for ti launchpad)
13  Using Arduino / Networking, Protocols, and Devices / Re: Problem with Nrf24L01+ and arduino mega on: February 24, 2013, 10:54:35 pm
The power supply on the megas can mess up this module. Try adding a large capacitor (>1uf) across 3.3v and ground
14  Using Arduino / Networking, Protocols, and Devices / Re: RF24 Library: Driver for nRF24L01(+) 2.4GHz Wireless Transceiver on: February 24, 2013, 10:44:31 pm
No problem! And yes it should receive less noise, so you might be able to get away with longer distances
15  Using Arduino / Networking, Protocols, and Devices / Re: RF24 Library: Driver for nRF24L01(+) 2.4GHz Wireless Transceiver on: February 24, 2013, 08:22:01 pm
I would add a large capacitor across 3.3v and gnd. I have had issues with the power supplies on arduinos (chinese clones :p), and that solved it every time. And I am going to attempt to make a wireless DMX transmitter with these transceivers, which will require sending a 512 byte packet at least every 50 ms. Any suggestions on optimizing settings and code to be able to pass data at this speed? I read earlier in this thread about removing the delays in the write function, should I do that?

Any help would be great,
ematson5897
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