Inforad siren modification

[tigersaw]

For DarrenSV650S, and anyone else who was on the thread about this, which I have lost..

I have managed to interface a siren to the inforad M1 bike GPS thats fitted to the bike.
The idea was that the siren would go off when the warning LED first comes on, and continues if it is flashing - i.e. speeding, otherwise it would cancel. Simply interfacing a siren to the red LED would mean the thing going off all the time at traffic lights etc.

Rather than build something from scratch, it was much easier to buy a timer kit from maplin and modify it.
The timer kit is VF06G - costs £7.99 and can be assembled in the time it takes to drink a coffee. Other cost was the 12v siren, and a small box. The siren can be anything, in fact the bike horn could be used, its a relay output.

The circuit is modified as below:

http://forums.sv650.org/picture.php?albumid=97&pictureid=2193

C2 is changed to 2.2uf to change the timer range to 0 - 10 seconds approx.
The TIP122 is used as an inverter, to change the trigger (LED drive) from +2.7v to a ground signal. Any NPN transistor used in saturated mode would work, I just had this one handy. The capacitor and 5k resisitor is used to make the curcuit work on edge triggering only, so that a constant LED on will only cause one trigger, but a flashing LED will cause the circuit to continually retrigger.
The additional switch (shorting the capacitor on the trigger input) allows the circuit to self test when you turn the ignition on - not good if you start the bike early in the morning.

I fit the device under the seat next to the inforad, using the same fused DC supply:

http://forums.sv650.org/picture.php?albumid=97&pictureid=2192

This is on my ER6 - I forget what the underseat looks like on the SV. I connected the siren via a phono connector - allows me to disconnect it should I want things silent, or if it all went pete tong.

I have tested it plenty around Southampton in the last few days, works a treat - its plenty loud enough to grab attention without having to look at the LED wand thingy. It will continue until you slow down and the LED goes constant.
The only thing I have noticed is that if you speed up again after you have passed the camera, the red LED will flash again and cause it to sound again, but I guess thats just it doing its job properly :)


Inside the box:

http://forums.sv650.org/picture.php?albumid=97&pictureid=2194

[DarrenSV650S]

Thanks for posting that :smt023

So I need this (http://www.maplin.co.uk/module.aspx?moduleno=3315), this (http://www.maplin.co.uk/Module.aspx?ModuleNo=1674), this (http://www.maplin.co.uk/Module.aspx?ModuleNo=12777), this (http://www.maplin.co.uk/Module.aspx?ModuleNo=19066) and a 5K resistor (can't find a single resistor on maplin, only big boxes). What size is the other capacitor?

[Sally]

Darren, i can easy swipe a couple 5K resistors and post them down to you if you want..

I owe you for the bar ends anyways..

[tigersaw]

Yes I think those links are correct.
The extra bits are,
2.2 uf capacitor, TIP122 or similar, 2k and 5k resistor, (you could use the R6 4.7k one in the kit, as its not required, its used for the reset switch which I didnt require)
The two unidentified capacitors are, ummm probably 0.01 uf, (WW18U), but anything up to 0.1 should work - as I said, I just used stuff out the junk box. The 2k resistor could just as easily be a 1k.
Also a switch to use as the self test switch.
The siren I used was YD84F, fits in the side plastic nicely. If you want to use the bike horn, then check how much power it consumes. If more than 1 amp, then I'd either not use it at all, or run a separate fused supply to point A on the circuit.

[tigersaw]

Inside the plastic box:

http://forums.sv650.org/picture.php?albumid=97&pictureid=2195

[DarrenSV650S]

Ok thanks again Tiger

Darren, i can easy swipe a couple 5K resistors and post them down to you if you want..

I owe you for the bar ends anyways..
That would be great. Have you got a 2K one too? :razz:

[yorkie_chris]

Cracking idea.

[Ceri JC]

...plus, if the siren is the right sort, when you're "making progress" the cagers should hear you coming and assume you're a copper and get out of the way. ;)

[Sally]

Darren what do you need exactly..?

Couldn't find any 5K resistors, theres 4.7K and ones slightly over 5K..

[dyzio]

There's no 5k resistors (in mrs16 size) , you can get 4k7 abd 5k6 or you could get precision resistors (4k99), similar with 2k.

I could find some for saoralba, next time I see him.

[Sally]

Don't worry, if its 4.7k and ~2K hes after, theyre easily swiped from college, no one evers seems to use them.. :)

[DarrenSV650S]

Don't worry, if its 4.7k and ~2K hes after, theyre easily swiped from college, no one evers seems to use them.. :)
I think that should be ok.

*waits for tigersaw to show up*

[Sally]

Mhm not in college till tomorrow, can swipe them then :)

[tigersaw]

Dont get hung up about the resistor values... The 5k is nominal, 3.3, 3.9, 4.7 all would be ok.Wouldn't go higher without making R4 higher as well.
The 2k again is nominal, I originally used 10k in the design, which worked in the lab, but not on test, as I later discovered the red and green LED's are not driven the same by the inforad, so I needed to reduce it. 2k was the first I tried, and it worked fine. You could use 1k with no problem I would imagine.

What I would suggest is you build the kit fully first, test it and get the setting of RV1 correct for an 'on' duration of about 1 to 2 seconds. Then modify it afterwards.

EDIT: Maplin sell resistors singly (15p each) , why not order them along with the kit and box etc?

[DarrenSV650S]

I couldn't find them, just boxes of loads of different sizes

[tigersaw]

I couldn't find them, just boxes of loads of different sizes

http:/maplin.co.uk/Module.aspx?ModuleNo=2162

Very slow website though, not even working properly tonight

[DarrenSV650S]

Just ordered all the parts. Were you able to keep the LED as well as the siren?

[tigersaw]

Just ordered all the parts. Were you able to keep the LED as well as the siren?

Yes, just join onto the red wire for the timer trigger

[DarrenSV650S]

The timer kit isn't even assembled! They didn't mention that on the maplin site

[yorkie_chris]

Timer "kit" not give you a clue? :-P

[tigersaw]

Only takes 5 minutes- see my earlier post :)

[DarrenSV650S]

How long does it take you to drink coffee? I haven't soldered for years

[tigersaw]

I built and tested the kit in about 20 mins. The kit is easy to build, I'd build it and test it before modifying it

[yorkie_chris]

So with such a device, could a suitably informed person make it power a relay when over the speed limit? The device must have speed and speed limit information. This could usefully power some IR LEDs...

I don't think that gatsos are too much of a threat, what with them being fairly visible. I reckon the main danger to license is the sneaky pig behind a bush with a laser gun.

[tigersaw]

Thats kinda what the mod does - 2 second alert when in the zone and continuous alert if exceeding the limit.
Then again, IR leds are low power, just leave them on all the time if you think they will help

[yorkie_chris]

Aye, but scamera vans won't be on the GPS database, and they are the really sneaky ones.

[DarrenSV650S]

OUCH!!

That's ok, I didn't really need that skin on my arm anyway

[DarrenSV650S]

What box did you get? The relay is too big to fit in the T2 box I got

[tigersaw]

not sure, but it was too tall for my box too, but having trimmed all the component legs and filed the top of the relay box it squeezed in. Shame you made the same mistake though....

[DarrenSV650S]

My 2.2uf capacitor doesn't have direction arrows on it. It has a long and short leg. Which is positive/negative?
And what's what with the TIP 142?

[tigersaw]

looks like this?
https://www.egr.msu.edu/eceshop/Parts_Inventory/images/10%20uf%20electrolytic%20capacitor.jpg

short leg is -ve.

dont understand what you mean about the tip 142

[DarrenSV650S]

The TIP142 has 3 pins but they're not identified

[DarrenSV650S]

I've finally got my finger out to try and finish this. Do I have to test the TIP142 to work out which leg is what?
http://i88.photobucket.com/albums/k164/DarrenStewartTait/DSCF0001-11.jpg

[tigersaw]

http://www.fairchildsemi.com/ds/TI/TIP142.pdf

[DarrenSV650S]

http://www.fairchildsemi.com/ds/TI/TIP142.pdf
Yeh got it now (http://forums.sv650.org/showthread.php?t=133512) cheers

I'll get that soldered tomorrow then it should be ready. Then I'll need to get it all in the box and tidy everything up

[cbay]

So anyone else tried this?

[timwilky]

So with such a device, could a suitably informed person make it power a relay when over the speed limit? The device must have speed and speed limit information. This could usefully power some IR LEDs...

I don't think that gatsos are too much of a threat, what with them being fairly visible. I reckon the main danger to license is the sneaky pig behind a bush with a laser gun.


your not thinking of using the relay to re orientate your plate. That would be naughty (but fun)

[yorkie_chris]

IR LEDs on the same frequency as scamera van laser.

It would be fun if I was a lot more cleverer to make a proper deceptive jammer so I'd get some speeding tickets for going past at 817.4mph, "loud can occifer, nah must have been a sonic boom".