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Last update : 2020/09/05

Motion sensor for photography and presence detector.

Here is a sensor that can be very useful for detecting the presence of animals or the movement of a human.
This sensor works with the "UNIVERSAL SENSOR FOR DSLR".
The scope of this sensor is 7 meters (23 Feet) with a maximum angle of about 120 degrees.
The principle is simple:
- The motion sensor detects movement of an object that emits heat.
- The sensor output value changes from 0 to 1 (from 0 volts to about 3 volts).
- The detector "UNIVERSAL SENSOR FOR DSLR" is set to "AUX", "DIGITAL VALUE" and "ON UPPER".
- The detector active the output and the digital camera.

This detector uses a PIR (Passive Infrared Sensor), that I bought on Ebay for about 2-3 Euros (around 3 Dollards).
To get one, look on Ebay the word "RIP" by searching in "worldwide".
Ebay launches by default searches only on your country.
The delivery tiem for items purchased in Hong Kong or China is about 4 to 5 weeks, but depending of your country.
Caution! It will take a PIR that works on + 5 volts, because there is also a lot of PIR operates in 12 + volts.

On the Photo01, the ultra simple block diagram of this detector.
The PIR is simply connected to the stereo jack 3.5 mm.

On photo02 and photo03, the PIR that I bought.
This type of sensor does not allow detection for high speed photography.
It is perfect for the detection of animals.
This type of detector has a tripping time of about 100ms (milliseconds).
Originally, this type of sensor is designed to alarm systems.
Thus, upon detection, the hold time is adjustable from 5 to 30 seconds.
For photography, this can be long.

It is possible to change the hold time and reduce it about 1 second.
As on the photo04, we will remove resistance (black rectangle with a value like 103 written on it).
If you bought the same exact sensor as me, we will remove the resistor R13,
and replace by welding or a piece of wire instead.
If your sensor is not exactly the same as mine, I traced lines with points on the printed circuit board (PCB),
that must be followed to find the good resistor.
All PIR sensors use an integrated circuit BIS0001.
The hold time is defined by a capacitor, a potentiometer and a resistor.
The potentiometer and the resistance are connected between legs 3 and 4 of the BIS0001.
So just follow the lines of copper on the PCB to find the good resistor.

On the Photo05, the box drilled to receive the sensor.
I added a small metal plate on the box, for adding weight in the sensor.
On the Photo06, the PIR sensor in this housing.
I stuck the velcro on the back of the box in order to fix it quickly on different media.
Photo07, the sensor set in place in the box.
On the Photo08, in the box finished, ready to work with the UNIVERSAL SENSOR FOR DSLR.

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Copyright 2012 ThierryD -
Last update 17/01/2012
Reproduction prohibited

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