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2 Sensors for Alarm with 1 connector


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vseth 
Copper - Posts: 60
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Joined: March 29, 2005
Location: Canada
Posted: April 08, 2005 at 1:12 PM / IP Logged  

Installing alarm/starter on my Toyota Corolla 1998 LE. The alarm unit has a 3-pin connector for an alarm sensor, i've got two type of sensors a shock sensor and a microwave/radar sensor, both with 3-pin connectors for the alarm. Since, i want to connect both of the units to the starter module, what would be the best way to do it. If I have to use diodes to isolate the two sensor circuits, I would appreciate a circuit diagram and the diode specs, if they are required. The three wires are:

red: alarms positive 12V output

black: ground

blue: trigger signal

Powermyster 
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Posted: April 08, 2005 at 4:09 PM / IP Logged  
2 Sensors for Alarm with 1 connector -- posted image.
vseth 
Copper - Posts: 60
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Joined: March 29, 2005
Location: Canada
Posted: April 08, 2005 at 6:48 PM / IP Logged  
No need to isolate the power / ground wiring ?
moshpitmickey 
Member - Posts: 43
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Joined: March 23, 2005
Location: United States
Posted: April 08, 2005 at 8:27 PM / IP Logged  
No, no need to isolate power and ground. Excellent diagram powermyster.
moshpitmickey
vseth 
Copper - Posts: 60
Copper spacespace
Joined: March 29, 2005
Location: Canada
Posted: May 11, 2005 at 2:15 PM / IP Logged  

Some questions:

- Which side should the cathode of the diode be facing ? The diagram below for isolating door triggers shows the cathode towards the triggers, whereas the diagram above for isolating sensors shows the cathode towards the alarm.

- Do both triggers need to be isolated ? The diagram below shows diode isolation on both triggers, whereas the diagram above shows diode isolation only on one of the triggers.

- With a microwave, ultrasonic and shock sensor ( have 2 sensor trigger inputs in alarm, three sensor triggers ), which two would be a better choice to isolate within one circuit, and which should be connected by itself. Does it even make a difference ?

- I'm attaching here some comments provided by the vendor of the alarm, warning about possible shorts. Am I taking any risk with this diode isolation, as his feedback is not exactly clear, is he just referring to bad wire splice connections or something else? Here's his input on connecting multiple sensors:

"there is the way to connect the  tripple senesor, but you must be very careful to make parallel connection . if you want to install two sensors in 1 input port: for example: since HT800D has only two sensor ports alarm, you need to connect them( two sensors) in parallel...
make sure please do not short the sensor port +  and -  during  two sensors connection.
if you make it short the sensor port (+ and -) you will fry the alarm
there are three wires in the port (+ , - , trigger)
I just want to warn you, all alarms has been checked before it shipping it out, so,,, make sure do not blame us if you make a short circuit. please just becareful. ( it is not recoverable once you make the damage on sensor port)"

https://www.the12volt.com/diodes/diodes.asp

2 Sensors for Alarm with 1 connector -- posted image.

floaterr 
Silver - Posts: 383
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Joined: December 07, 2002
Location: United States
Posted: May 13, 2005 at 3:18 AM / IP Logged  
1- Believe your right about the diodes being backwards on the twin shock sensor setup.
2- Yes both triggers, however your sensor only has 1 trigger wire correct? So in your case wouldn't be able to install 2nd diode.
   As for the door you have to think of it this way. You don't CUT the shock sensor trigger and put a diode inline AND another diode inline with the motion sensor. You just have to isolate 1 from the other. Doing so with both sensor trigger wires because the sensors are like 2 different cars. (kinda like a 4 door car but not exactly).
3- I'd put your ultra and microwave together. Only cause they basically detect the same thing; movement inside the vehicle.
EXAMPLE: (if you had an LCD alarm)
   The shock sensor goes off and then next you see the motion/sonic went off. <- someone got inside most likely
Just the shock zone goes off. Could be someone bumped the car, bass from a car, etc... May not be neccicary to get the gun and go running.... naked... ;)
vseth 
Copper - Posts: 60
Copper spacespace
Joined: March 29, 2005
Location: Canada
Posted: May 13, 2005 at 8:02 AM / IP Logged  

Question 2: "Do both triggers need to be isolated ? The diagram below shows diode isolation on both triggers, whereas the diagram above shows diode isolation only on one of the triggers."

With both triggers, I'm not referring to 2 triggers as in a dual-stage sensor, but the fact that I have two sensors with one trigger each. So if I put a diode only in one sensor's triggers ( as in the diagram above ), does that not leave open the trigger wire of the other sensor to a loopback when the diode-isolated trigger fires ( if that's even an issue ) ?

vseth 
Copper - Posts: 60
Copper spacespace
Joined: March 29, 2005
Location: Canada
Posted: May 13, 2005 at 8:23 AM / IP Logged  
Also any input on the 4th item in the "Some Questions" post above ?

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