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Topic: Help with PWM led setup 7X2 (Read 767 times) previous topic - next topic

I posed on here a while back about making a integrated turn signal/brake light and im finally able to start working on it again.  I changed a few things to hopefully make it brighter and easier.

I will be using these led's since they have a better beam angle and are much brighter that my previous ones.
http://lighthouseleds.com/5mm-piranha-led-red-ultra-bright-10-000-mcd.html

Can my arduino Uno r3 handle this or will i need shift registers and led drivers?  Would esentially make a 7x2 matrix?  What wiring would be best for this and help with fluid animations?

It will be basic operation for the most part.
       Motorcycle on (no brakes) = X% brightness
       Brake applied = 100% brightness
       L/R signals = 100% brightness fading from bottom to top similar to this video  http://youtu.be/5ubGnuJhvsY?t=37s

How would i use the arduino to read the left/r signals activated and then trigger the animation?

I tried looking for a while to find a similar code that i can use but didnt find much.  I would appreciate any help

fungus


Can my arduino Uno r3 handle this or will i need shift registers and led drivers?  Would esentially make a 7x2 matrix?  What wiring would be best for this and help with fluid animations?


Using a LED driver is always a good idea. Messing about with resistors, etc. will always lead to sub-optimal brightness control.


Would esentially make a 7x2 matrix?  What wiring would be best for this and help with fluid animations?It will be basic operation

for the most part.
       Motorcycle on (no brakes) = X% brightness
       Brake applied = 100% brightness
       L/R signals = 100% brightness fading from bottom to top similar to this video  http://youtu.be/5ubGnuJhvsY?t=37s


14 LEDs with variable brightness says "TLC5940" to me.


How would i use the arduino to read the left/r signals activated and then trigger the animation?


I dunno, I can't see your bike from here...

Are the original lights LEDs or light bulbs? Where do the wires from the switches go? Is there a control box full of electronics anywhere?

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

dc42

For maximum brightness, use an LED driver such as the TLC5940. If you can accept slightly lower brightness, connect the LEDs in a 7x2 matrix, with 7 series resistors and 2 transistors.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

rickso234

If you can live with 6 channels, an Uno has 6 PWM channels and I'll bet you can come up with a clever way to mux the left and right sides (the ""2" part of the 6x2 matrix). You could possibly use a 7th digital channel and that one could either be 0-100% or you can write some code to PWM that digital channel. I believe the Uno can handle this on its own, with a few resistors and transistors.

strykeroz

Hi,

Which method did you run with in the end, and did you try them at 1/10th duty cycle at 1kHz PWM with 75mA current ?  How do they look?

Geoff
"There is no problem so bad you can't make it worse"
- retired astronaut Chris Hadfield

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