[tog] Micro Controller for LED’s

Tara Whelan sweetnessiwasonlyjoking at gmail.com
Tue Nov 13 16:47:37 CET 2018


By Audi indicators do you mean like this? https://youtu.be/r9Fin7pyzDc

If so, I'd definitely use neopixels for them. They're more expensive than
regular LEDs, but the heartache you'll save yourself rather than trying to
multiplex/charlieplex the standard LEDs would make them far, far preferable
for this function.

Here's a similar example: https://youtu.be/wc5ozTiFxUw

On Tue, 13 Nov 2018, 15:38 Daniel Cussen via tog <tog at lists.tog.ie wrote:

> Instead of using a microcontroller with 30 outputs, you normally use some
> firm of rows and columns set up to reduce the number of outouts . This is
> called a matrix, and an advanced version is called charlieplexing:
>
> https://en.m.wikipedia.org/wiki/Charlieplexing
>
> For 30 leds I would recommend using an arduino, suited to accept a 'LOL
> shield'
>
> This was designed to plug straight into an arduino uno and drive a large
> number of LEDs. You do not actually need the shield, but it would be a good
> start and help you learn how to get it to work. If you bought two shield
> you could use one standard for learning and use the second one for the
> final use by moving the LEDs away from the arduino to where they are
> needed.
>
> If you search for the lol shield you can get more information.
>
> The main downsides are that the LEDs all need to be the same type and
> colour or they may have brightness and reliability issues. The firmware
> also loads the microcontroller quite heavily, updating the led status
> constantly in real time.
>
>
>
>
>
>
> On Tue, 13 Nov 2018 12:48 Serge Bazanski via tog, <tog at lists.tog.ie>
> wrote:
>
>> Operate them in what matter exactly? Do you want to control their
>> brightness, eg. via PWM? Do you want to also control them from a host
>> device?
>>
>> Serge
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