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tilt sensor only


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jackvz 
Member - Posts: 5
Member spacespace
Joined: December 17, 2014
Location: Texas, United States
Posted: December 17, 2014 at 2:59 PM / IP Logged  
IS there any way I can just add a tilt sensor, and by using a relay that switches ground to the sensor with ACC/IGN, send a signal to the horn??
I dont really need/want to install a complete alarm system if I dont have to. I just need the tilt alarm.
I figured if I wired relay as following: 85 ground, 86 Ign/Acc, 30 ground, 87A (normally off) to tilt sensor ground. That way when ign is off, the ground to tilt sensor is 'on' and sensor would be armed.
I would then take output of sensor and wire it to horn/siren.
Does this make sense? WOuld that work?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 17, 2014 at 5:38 PM / IP Logged  
Yes it would.
But diode across 86 and 85, 1N4004 band towards 86 otherwise you'll kill the sensor.
jackvz 
Member - Posts: 5
Member spacespace
Joined: December 17, 2014
Location: Texas, United States
Posted: December 19, 2014 at 10:16 AM / IP Logged  
I am not sure if I follow the need for the diode?
85 and 86 operates the coil with 85 to ground and 86 coming from IGN/ACC... When coil is open (IGN/ACC off), the ground would be not interrupted and tilt sensor would operate since 87A is the normally off post. With the coil closed (IGN/ACC on), post 87A would not be connected to ground anymore and the sensor would not operate (when driving...)
I understand that the diode blocks current flowing in a certain direction but what would the diode do between 85 and 86?
Great if you could explain to me as I dont want to ruin the sensor or cause issues with the wiring in my truck
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 19, 2014 at 10:26 AM / IP Logged  
When a relay shuts down, it sends up to 200 volts as a back EMP towards the sensor, along the 85 line, frying it.
Placing the diode there acts as a "quenching" device.
jackvz 
Member - Posts: 5
Member spacespace
Joined: December 17, 2014
Location: Texas, United States
Posted: December 19, 2014 at 10:46 AM / IP Logged  
ok, even though it is only ground going from relay to sensor?
With the diode, I guess i would protect the vehicle wiring as the only voltage from truck comes in at 86 on relay and with 85 wired to ground?
If the diode was between 87A and sensor it would kinda make sense although 87a only provides ground..?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 19, 2014 at 11:02 AM / IP Logged  
No it's the coil 85 and 86 that sparks on shutdown.
In fact study your history "spark gap" radio transmitter back to Marconi.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 19, 2014 at 11:03 AM / IP Logged  
Read this:-
http://www.bcae1.com/relays.htm
jackvz 
Member - Posts: 5
Member spacespace
Joined: December 17, 2014
Location: Texas, United States
Posted: December 19, 2014 at 11:30 AM / IP Logged  
very interesting reading, much appreciated, thanks!
jackvz 
Member - Posts: 5
Member spacespace
Joined: December 17, 2014
Location: Texas, United States
Posted: December 27, 2014 at 3:34 PM / IP Logged  
Well. That didn't really work. The trigger output from the sensor doesn't seem high enough to activate a relay. Without ground, the blue wire outputs 11v but with the ground interrupted, the voltage drops to millivolts.
Would there be another way to use the sensor without adding a full alarm system?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 27, 2014 at 6:07 PM / IP Logged  
Sorry, should have mentioned that at the start, AFIK, none of these add-ons will work without an alarm system.

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