On Shine 433MHz Transmitter/Receiver, connection to a Pir sensor?

Help & Support Robot Parts
1

Hi there.
I have a house alarm system and want to convert my pir sensors to wireless.
I have medium knowledge of electronics and have the following problem.
I have bought 3 modules from the Robot Shop to experiment with, but with no results.
I will start from the begining; the pir is a Optex EX-35R Battery operated picture follows…Optex battery Operated EX-35R.6X8.jpg and a data sheet in zip.
The transmitter and receiver modules I have are:

  1. On Shine 433MHz Low Cost Transmitter/Receiver Pair
    2)SFE - RF Link - 2400bps - 315 MHz
    3)On Shine 433MHz High Sensitivity Transmitter/Receiver Pair.
    I have enclosed picture of the RX/TX modules data sheet also.
    Is the pir monitor analogue pulse and must be converted to digital so it can work?
    Any suggestions on how to connect the pir sensor to the TX module and the Rx to my alarm input would be appreciated.
    Thanks for your time.
2

Hi there.
Thanks for your welcome and your fast reply.
The zip is in pdf format but is not compressed correctly?
I will upload it again.

…Zip file uploaded again and tested ok.

Thank you.

3

Ok.
I have a link that has the installation manual optexamerica.com/productpage.aspx?l1=1&l2=6&id=16
it is at the bottom of the page,the …Download EX35T Installers manual,
sorry for the trouble.
I will try tonight the voltages as you describle.

Thank you.

4

Hello again.
I do not understand the output (N.C. 28V DC 0.2A max.)??
Where are these voltages?
I forgot to mention that…The alarm system is a autonomus battery operated unit that works at 4.5v volts,(my patent)when triggered I have 0volts,
and in idle mode 3,7v-4,5v max.
I have attached a jpg plan of what I must connect,please see if my connections are wright.

Thank you again.

5

Hi dimos44, welcome to the RobotShop forum!

I am unable to open the installation manual, what format is that file?

In theory, whatever is placed on the TX pin of the trasmitter, comes out on the RX of the receiver. We need to determine the output of the sensor and also make sure is works in the 0-5VDC range, used by TTL level electronics such as these communication devices. A voltmeter can help in this task.

6

Still cannot open the file. The zip decompresses and inside is a file named “InstallationManualEX-35R[1]”. Renamed to .pdf and acrobat doesnt recognize the file type.

Take a voltmeter and look at the output voltage on the trigger, possibly 12V hopefully 5V. If it is not 5V, a “voltage divider” should be created to bring the voltage down to 5V. Once we know that it is as simple as connecting it to the TX pin and grounding everything together. You should then see that the output on the receiver mirrors the output on the sensor.

7

Those values were in the specifications, alarm output. Maybe i was looking at the wrong data for your device.

The R model claims: Form C solid state switch 10V DC 0.01A max
The T model claims: N.C. 28V DC 0.2A max

Your diagram looks fine.

8

The output appears to be (N.C. 28V DC 0.2A max.)

This means in normal state, it outputs 28V from the output. When the alarm is set off, the output goes to 0V.

You’ll need a voltage divider circuit (using 2 resistors) to bring the 28V down to 5V:

raltron.com/cust/tools/voltage_divider.asp

Verify the voltages with a voltmeter first, then plug that into the transmitter TX pin.

On the receiver side, you can monitor the RX pin for its state (0V=Alarm triggered, 5V=Situation Normal).