Here’s a simple guide on how to make a pressure sensitive
siren that only goes off if someone sits on your bike
Things needed:
1. Automotive
5 pin relay (30 to 40 amp relay)
2. Wire
3. Spring
4. Microswitch
5. Siren
6. Fuse
7. Wire
tape
What to do:
I will not write up on when to wrap the wire with wire
tape, if you don’t know, you shouldn’t be doing this!
Step 1: Figure out
stuff:
Find out the following:
1. Where
is a key activated positive (check your headlamps or meter light)
2. Where
to mount your siren discreetly.
3. Grounding
Points
4. How
to mount the pressure switch with a spring
Step 2: Hook everything up:
1. Connect
the positive lead of the siren to a fuse (30 amp)
2. Connect
the fuse lead to the positive terminal of your battery
3. Connect
the negative terminal of the siren to connector 87A on the relay
4. Connect
relay terminal 30 to the microswitch and from the microswitch to a good ground
or battery negative terminal
5. Connect
the key activated positive (low amp discharge will be fine) to relay terminal
86
6. Connect
relay terminal 86 to a good ground location or negative battery terminal.
Micro Switch
Spring (an old valve spring or clutch spring)
Automotive Relay
Siren
30 = Ground
87A = Siren Negative Terminal
86 = Key activated positive
85 = negative/ground
By Vy
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