Detailed overview of the functions of the pyroelectric motion sensor HC-SR501 with examples of configuration and connection.
Sensor HC-SR501 is designed to detect the movement of people and other objects whose temperature is different from the ambient temperature. The sensor has a removable Fresnel lens to increase the radius of action up to 120-140 °. There are two potentiometers on the module: with the first one, the sensitivity of the sensor is adjusted; with the second, the delay time after operation is adjusted. To power the module, you can use a source with a voltage from 5 to 20 volts. When motion is detected, the signal output will be 3.3 volts regarding to ground. To connect to the load, such as lamps, you can use an electromagnetic relay. You can also use field-effect transistors to connect a powerful load. In addition, the motion sensor can be connected to the digital input of microcontrollers, such as Arduino, NodeMCU or Raspberry Pi.
Motion Sensor HC-SR501: ali.pub/31ont5
Suitable relay (High Level): ali.pub/4pubzm
Join the VK group: buychinaproduct