Introduction: PIR Motion Sensor for Fischertechnik

I show the possibility to use a PIR sensor with fischertechnik.

With the sensor you can switch your modells on/off.

The PIR Sensor senses the motion of a human body.

Step 1: Technical Data

I use the PIR model HC-SR501.

PIR HC-SR501
Operating voltage range: DC 4.5-20V
Level output: High 3.3 V /Low 0V
Delay time: 5-200S(adjustable)
Costs: 5€

I use a darlingten power transistor 2N6387 as output driver. A 3 Volt Relais or a power MOSFET would be other alternatives.
The 2N6387 is strong enough for  induktive loads like toys motors.

power transistor 2N6387
8 AMPERES
65 WATTS
60VOLTS

Other parts:

1x fischertechnik base plate 45x45 mm
2x M2 screw 20 mm and nuts
2x fischertechnik or Märlin 2,6mm plugs
1x Märklin 2,6mm socket for output
30cm triple cable
10x30 mm prototpye circuit board

Step 2: Implemetation

Prepare the circuit boad as shown in the drawing.
Cut the copper track on pin3!
Solder the Transistor and solder the board on the sensor.
Solder the (+) (-) cable on the board.
The collector is the output.
The load is between collector and operating voltage.

Step 3:

Take a 45x45 fischertechnik base plate.
There must be no holes drilled. The screws fit into the slots.
Screw the plate with two nuts per screw.


Step 4: Action Video

The short video show the PIR sensor in action.
The PIR is in the lower left corner of the model.

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Bio: I live in Braunschweig, Germany with 3 children. We love to build and experiment.
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