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There have been 78 items by Kermit (Search limited from 14-July 24)
#28447 TLC5940 PWM Driver
Posted by
Kermit
on 02 May 2012 - 06:01 PM
in
Project Showcase
#28451 TLC5940 PWM Driver
Posted by
Kermit
on 02 May 2012 - 08:42 PM
in
Project Showcase
#28445 TLC5940 PWM Driver
Posted by
Kermit
on 02 May 2012 - 04:06 PM
in
Project Showcase
#28780 TLC5940
Posted by
Kermit
on 10 May 2012 - 05:55 PM
in
General Discussion
#28450 TLC5940
Posted by
Kermit
on 02 May 2012 - 06:59 PM
in
General Discussion
There is already another thread, where I asked for info, http://forums.netdui...h__1#entry18925 but I see that it doesn't come up on the list (maybe it's too old), so I start a new thread here.
I found very difficult even only to understand the needed wiring, so a very very short mini-tutorial would be really appreciated (not only by me, I'm sure...).
Thanks in advance
Andrea
#28831 TLC5940
Posted by
Kermit
on 11 May 2012 - 03:55 PM
in
General Discussion
#28941 TLC5940
Posted by
Kermit
on 12 May 2012 - 10:08 PM
in
General Discussion
#28805 TLC5940
Posted by
Kermit
on 11 May 2012 - 10:10 AM
in
General Discussion
#28482 TLC5940
Posted by
Kermit
on 03 May 2012 - 02:11 PM
in
General Discussion
#28851 TLC5940
Posted by
Kermit
on 11 May 2012 - 07:17 PM
in
General Discussion
#28495 TLC5940
Posted by
Kermit
on 03 May 2012 - 04:32 PM
in
General Discussion
I found a small but interesting document here: TLC5940 One-Wire Control, where, with an apparently simple wiring, I should be able to turn on and off the entire block of LEDs. The only interesting page is page 3, even if the whole document is there.
I wired the chip in this way:

and used this code to try to get the led flashing:
Thread.Sleep(300); var gsclk = new OutputPort(Pins.GPIO_PIN_D0, false); var blank = new OutputPort(Pins.GPIO_PIN_D1, true); Thread.Sleep(200); bool enable = false; while (enable) { blank.Write(enable); Thread.Sleep(1); gsclk.Write(!enable); Thread.Sleep(2000); enable = !enable; }
Here I'm supposing I can use the Netduino to turn high and low the two signals GSCLK and BLANK, with a simple delay, as suggested by the document (it uses a subcircuit, there).
The other difference is the capacitor in the bottom of the figure, between Vcc and ground: there are no numbers, and I suppose it's there to stabilize input voltage (or not?).
Please, is there someone who can give a look and enlighten me on anything that can be wrong?
Thanks again.
Andrea
#29022 TLC5940
Posted by
Kermit
on 14 May 2012 - 03:20 PM
in
General Discussion
#28496 TLC5940
Posted by
Kermit
on 03 May 2012 - 04:40 PM
in
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#28745 TLC5940
Posted by
Kermit
on 09 May 2012 - 08:14 PM
in
General Discussion
Goedenavond
According to the schematic, it's not such a difficult set-up.
The 2k2 resistors are, according to the description "to make this board suitable for use with servos".
This is really strange: at the end of page 14 of the datasheet (http://www.ti.com/li...ink/tlc5940.pdf) there is the formula to use for the resistor.
Iout = 39.06 / R (simplified)
with the range of 5mA and 120mA.
I use a 100 Ohm resistor (but I could never light any led!) giving an output of 39mA, with your resistor you should have 0.017mA, way under the lower limit.
Are you sure there are no other components wired to Iref?
Andrea
#28785 TLC5940
Posted by
Kermit
on 10 May 2012 - 08:45 PM
in
General Discussion
#28747 TLC5940
Posted by
Kermit
on 09 May 2012 - 08:16 PM
in
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#28815 TLC5940
Posted by
Kermit
on 11 May 2012 - 12:33 PM
in
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#28748 TLC5940
Posted by
Kermit
on 09 May 2012 - 08:22 PM
in
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#28848 TLC5940
Posted by
Kermit
on 11 May 2012 - 06:29 PM
in
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#28756 TLC5940
Posted by
Kermit
on 09 May 2012 - 09:09 PM
in
General Discussion
#28858 TLC5940
Posted by
Kermit
on 11 May 2012 - 09:42 PM
in
General Discussion
#28759 TLC5940
Posted by
Kermit
on 09 May 2012 - 09:28 PM
in
General Discussion
#29012 TLC5940
Posted by
Kermit
on 14 May 2012 - 02:19 PM
in
General Discussion
#28770 TLC5940
Posted by
Kermit
on 10 May 2012 - 11:37 AM
in
General Discussion
#29024 TLC5940
Posted by
Kermit
on 14 May 2012 - 03:31 PM
in
General Discussion
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