LED warning lights DIY

porkchop

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So I have an R3 on its way via ebay to NZ (btw many thanks to those forum members who offered to help re purchasing) and I now want to build a warning system that displays light and sound. I figured a bluetooth transmitter pairing with my Sena headset would do for the sound part, but there is some doubt that I would hear it as the bike bangs and rattles along, plus wind noise as well. I have read plenty of threads where people say visual warning is superior and vice versa so I figured why not try both?

The problem to solve is getting an LED to light up preferably modulated to indicate strength. I could buy something but there is an appeal to building my own. My riding buddies have the h.a.r.d system but being tight I cant bring myself to pay almost as much for that unit as I did for the RD. Having a look its just a bluetooth tx/rx system with a light on a stalk. Can anyone here point me in the right direction to get the circuit diagrams, parts, either an arduino or of the shelf bluetooth units that could work? Failing that just a simple non bt system that uses the signal from the audio out to drive a few LED's

I am not totally impracticable but haven't done electronics since I started working life as a phone tech 45 years ago!
 

The Mighty Four Banger

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Well if you buy the uniden hardwire kit you can crack it open and desolder whats in there and make extensions for it. I used some tiny speaker wire I had laying around to extend the mute button out 6’. Other members have done things like also run extensions on the LEDs to the headliner. The Uniden kit is about $30 on Amazon.

Hopefully that helps if you can’t figure out the varying intensity style you are hoping for, I’m not electrically inclined at all so I couldn’t help you.

As far as details go, the button is just shorting power to ground and the LEDs are all the same way. The detector takes care of everything and the LEDs and button just go to ground. What you might also not know is that there is a power LED that is on when the detector is on (not just when it has power) and that the alert LED blinks with a varying speed based on signal strength.
 
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porkchop

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Thanks, thats a simple solution. So I could have two alerts- one through the bt-sena connection and the other via the hardwire kit.
 

The Mighty Four Banger

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Yeah the thing is I think there are only three modes for the alert. No alert, slow blink, fast blink. I can go check if you’re interested.
 

porkchop

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That would also tend to indicate that a couple of pins in the rj11 provide a signal so perhaps a neater solution could be to tap into those directly to fire the LED?
 

SquirrelMaster

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Check this thread out
 

porkchop

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Thanks, so have I got this right; the activity light is always on but blinks on alert?
 

SquirrelMaster

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Thanks, so have I got this right; the activity light is always on but blinks on alert?
Correct. Its a way of telling you the detector is turned on and running if you can't see the screen or have the screen off.

You can invert that easily if you don't want that.
 

porkchop

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definitely want that inverted as you need the instant reaction that a warning light gives. How do you invert it, in the other thread it suggested building another circuit with transistor etc.
 

SquirrelMaster

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definitely want that inverted as you need the instant reaction that a warning light gives. How do you invert it, in the other thread it suggested building another circuit with transistor etc.
Transistor exactly. That's the cheapest and easiest solution that isn't ghetto
 

Biohazardous

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Just roll the dice like I do! Haha seriously I need to put a detector back on mine :(
 

LouG

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I found that visual alerts were too easily missed, even in the helmet itself. Sunstrike makes it impossible to see it, and if it's very bright you might need a dimmer for night use.
I use a B/T set up to my helmet and can easily hear all alerts and announcements with ear plugs in and at high speed.
My helmet isn't the quietest either.
Best to see what suits you.
 

Saussie

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Sounds like you're wanting an Led volume meter or graphic equaliser type setup. So when it alerts, it just shows volume visually?
If so, and you're handy with a soldering iron, I'm sure you'll find a cheap hobby kit somewhere. I gather you would line out/headphone jack out of the rd, into the volume meter, and any volume should light the led volume meter up. If you have it turned up to full volume, the Led should light right up.
Bit more basic than some of the suggestions above but similar principle if an indication is what you want. Would be instant as soon as volume is sent to it.
 
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