Hello all,
i'm new in this field and im using a sensor Honeywell DT-7235T and i want to connect alarm with it,
the sensor is working when i plugged but when it try to connect the alarm with it doesn't trigger !
they are 4 pins 2 for power and 2 for alarm and there is also the tamper ?
should i connect the tamper to trigger the alarm ?
thanks for help.
Welcome. You will get more help if you tell us what a Honeywell DT-7235T is. A quick search for a user manual for a DT-7235T shows it's likely to be a PIR sensor. The T variant has the tamper circuit as well. The image below is a taken from the user manual/guide:
The tamper circuit is likely to be a simple link/short between the two T pins.
The alarm is likely to be a pair of contacts on a relay: C = Common and NC = Normally Closed. Put a multimeter between C & NC and measure the resistance. It most likely goes from a short (or very low resistance) to open circuit when the sensor detects motion.
You can probably treat the alarm signals as a simple pushbutton as far as an Arduino is concerned.
Thanks Mark for your reply
im already have the manual but i don't understand what's the purpose of the tamper ?
i want to connect the alarm directly to the PIR sensor when the sensor detext motion it will trigger the alarm is this possible ? and if i need any other equipments ?
do have any idea how to connect this one with THE PIR SENSOR ?
The PIR may tigger for a second or so then re open - so your siren will not sound for very long .
Tamper wires are just a loop normally wired back to the alarm system controller so it can detect if the cable to the sensor has been cut . There is often also a switch inside the PIR so the tamper loop is broken if someone opens up the sensor
thnks hammy for your help
my goal is to trigger the siren when there's a motion
can you help me how to connect the wire from the sensor with the siren ?
and if i need any other equipment cause my goal is to made a simple system alarm
You will need some more bits:
The siren may only sound for a second or so —you need at least a relay to latch the siren on and a push button to reset it .
You can forget about the tamper connection.
It looks like the sensors contacts open when it’s triggered , so you need the relay to also turn the siren on when the contacts open .
I’m not going to design this and suggest you google simple alarms , relay latches , to get the idea .
I'm a bit late into this topic, but you can use a single pair of signal wires to detect fault, intrusion and tamper. See
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