Hi!
You can skip this paragraph>>
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I am a long time follower but only recently registered. Some of you have helped me with previous projects such as my bike light for physics in grade 10. In any case, I’ve decided to do another project and i think I’ve bitten off more than I can chew.
The project I am working on is a sweeping indicator. (If you don’t know what that is, just goldgelb audi-indicator). I have created one using Arduino (as I have a few) but felt like it was overkill and Didn’t want to use 4 units or wiring that goes to each corner of the car. Also, I’ve seen so many on eBay for like $5 I figured there has to be a cheap IC approach.
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To create a sweeping indicator (Audi-indicator), I decided to get a 555 timer to generate my about 0.07sec per light flash rate using a 8.2k
![Ohms \$\Omega\$](https://www.eevblog.com/forum/Smileys/default/omega.gif.pagespeed.ce.G89vbH4KGC.gif)
and 1k
![Ohms \$\Omega\$](https://www.eevblog.com/forum/Smileys/default/omega.gif.pagespeed.ce.G89vbH4KGC.gif)
resister (I think). Flash rate is all good. I found this from roughly 85 flashes a minute and running 10 lights.
![Clapping :clap:](https://www.eevblog.com/forum/Smileys/default/clap.gif.pagespeed.ce.LImJbaO0yv.gif)
Now, I was considering to use a LM3914 in bar graph mode to allow me to have a signal at around the wanted timing. From here as my led-chips are almost a watt each, I was gonna use a mofset or something similar. Somehow, I can’t seem to get the signal from the 555 timer to work with my 3914. Any ideas?
Happy to completely scrap this and use someone’s design if they have one?
Any idea how Audi themselves do it?
Is there perhaps a dedicated chip that does this already?
Please ask questions or just tell me how you’d do it as I may have done a silly billy
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/xfacepalm.gif.pagespeed.ic.EBDwh1hCfo.png)
mistake.
![Banging Head |O](https://www.eevblog.com/forum/Smileys/default/bangheadonwall.gif.pagespeed.ce.8iLbFYV4Bc.gif)
Thanks on advance. Happy to be part of the team.