Assemble a smart switch without a microcontroller. Connect this motion sensor to your relay and the device is ready. Three trimmer resistors will set the sensitivity, interval, and response time.
This module is connected to the control electronics - Arduino, Iskra or Raspberry Pi - with the usual Troyka cable. On the board, the module transmits a digital signal — zero at rest and a one when motion is detected.
The module is based on the pyroelectric effect. Under the influence of thermal radiation in the crystal, electric pulses are created.
A PIR sensor with two bipolar sensing elements reads the ambient temperature. When a warm object appears in sight, a positive impulse appears on the first element. The object moves further and gets into the field of view of the second element, negative impulse occurs. Multidirectional pulses are understood by the data processing chip. A high logic signal appears at the output of the module.
Three potentiometers are responsible for fine tuning the operation of the module:
The module operates in one of two modes, which is selected via jumper. For different use cases of the module, we have provided two modes of operation. The mode is set by the AUTO-RESET jumper:
On the sensor is a group of Troyka-contacts: