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1  Using Arduino / LEDs and Multiplexing / looking for a super source driver chip any ideas? on: November 17, 2012, 09:58:33 pm
Hi guys im looking for a super source driver than can source 500ma each channel
and 8 outputs

just like the M54564P
im looking for a source driver than drive 500mA per output channel.

is there any other chips with similar functions such as this one?
2  Using Arduino / Microcontrollers / need help with setup to program atmega328P on: November 14, 2012, 01:46:23 pm
hi guys im a newb at microcontrollers

How do I program the atmega 328P with the arduino uno R2 ?

3  Using Arduino / LEDs and Multiplexing / Re: help with 8x8 common anode rgb matrix panel on: November 10, 2012, 03:22:34 pm
well im using the LED drivers TLC 5940 to do the pwm for me
and using the atmega 328P, programming it with the arduino uno.


so that should take care of the brightness/dimming?

i am just trying to simulate a basic 8x8 common anode matrix (row scan) in LTspice

trying to obtain voltage/current waveforms.
4  Using Arduino / LEDs and Multiplexing / Re: help with 8x8 common anode rgb matrix panel on: November 10, 2012, 03:15:10 pm
thanks for the website that helped,

since im using a common anode matrix, and will be doing row scanning

im using a PNP transistor current source, what kind of signal is coming from the arduino pin? is it just a digital High/Low (1/0) or a certain voltage
5  Using Arduino / LEDs and Multiplexing / Re: help with 8x8 common anode rgb matrix panel on: November 10, 2012, 02:50:18 pm
well here is my hardware config, im just trying for a basic simulation in LT spice




im trying to simplify the panel so that I can observe voltage, current, and power waveforms.

So my question is, for a common anode matrix 8x8
do you hook up a voltage DC source at the anodes
and what do you hook up to the RGB pins.

for a simple simulation, I do not want to make the circuit from the chips im using for my project, i just want to simulate a simple 8x8 common anode matrix and understand the waveforms.

6  Using Arduino / LEDs and Multiplexing / help with 8x8 common anode rgb matrix panel on: November 10, 2012, 02:16:30 pm
I am trying to understand how the common anode matrix works
here is what my setup looks like in LT spice and I will be trying to simulate it and get results such as power, current, and voltage.




so the common anodes are connected to a DC voltage, in this case I used +5 volts
and the RGB pins have to have PWM on it so that it knows when to turn on/off according to the duty cycle

can someone help me clarify on that, thanks alot of reading this.

What I think:
If one row is of LEDS is turned on, so 8 LEDS = 8X3 = 24 LEDS * 20mA = 480 mA needed to supply for 1 row? since 20 mA is usually for max brightness.
Do I use P=V*I to calculate power so 5 Vdc * I = power? what about the Voltage in the PWM?
7  Using Arduino / LEDs and Multiplexing / Re: need help with IC wiring on: November 04, 2012, 09:05:27 pm
Thanks for your input, Once i figure out where I want all the wiring to go, I want to test it.

Is there any simulation software for to test out this set-up?

Or is it better to just write some code in the atmega chip and see if I get the right output on the lights?

8  Using Arduino / LEDs and Multiplexing / need help with IC wiring on: November 03, 2012, 07:27:15 pm
Hey guys so I am in the process of learning how to drive an 8x8 common anode matrix with 2xTLC5940 chip
Using a multiplexer (CD4051BE) to switch through rows and the super source driver (M54564P) to connect to the anodes

My idea is to use the atmega 328P chip to program but I am not so sure about where each pin of the TLC 5940 goes to what spot on the ATMEGA 328 chip and also where do I connect the A,B,C pins of the multiplexer to the ATMEGA chip.
I would appreciate the help, i am very new to electronics.

Here's a picture of what I am planning to do and the wiring I have done so far.
9  Using Arduino / LEDs and Multiplexing / Re: help with cadsoft and rgb multiplex idea on: November 03, 2012, 12:50:14 am
ok for the eagle cadsoft part

I am trying to find a library that has M54564P but i cannot find it

is there a chip that i can use in eagle that has a similar structure as this one?
10  Using Arduino / LEDs and Multiplexing / Re: help with cadsoft and rgb multiplex idea on: October 31, 2012, 08:33:20 pm
are there enough pins from the arduino to hook them up directly to anodes?

I seen the idea of hooking the UDN2981A, but another guy recommends M54564P  since it has a faster turn-off delay to avoid ghosting.

http://arduino.cc/forum/index.php/topic,18464.15.html

whats the idea of hooking the source driver to the anodes?

when you can directly hook them up to the atmega chip in the arduino to control them?

11  Using Arduino / LEDs and Multiplexing / help with cadsoft and rgb multiplex idea on: October 31, 2012, 03:40:20 pm
Hi im a beginner in electronics, so please bear with me since im newbie =)

First, if anyone is proficient in eagle, do i make a part TLC 5940 or can i find a library somewhere that has this.

Ok my idea is that im trying to do an 8x8 rgb led matrix that will use 2 x TLC 5940 to drive the RGB rows of the matrix.

I want to supply voltage from the arduino is it possible to supply from usb?

What's the idea behind using source driver on the anode row, i thought anodes connect to ground?

sorry for all these questions but I really want do a cool pwm 8x8 rgb led matrix circuit.
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