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Simple to use motion sensor. It only requires a microcontroller I/O pin and can be powered with 4.5V-20V. The output signal is TTL 3.3V and works well with 3.3V devices like Raspberry Pi and esp8266 and 3.3V tolerant micro live a 5V Arduino. Once powered on, the sensor will get a snapshot of the still room within 2 or 3 seconds. If anything moves after...
This 9 Axes Motion Shield co-developped with Arduino and Bosch is based on the BNO055 absolute orientation sensor. It integrates three 3-axis sensors : a 14-bit accelerometer, a 16-bit gyroscope and a geomagnetic sensor coupled with a a 32-bit microcontroller.
This infrared sensor GP2Y0A02YK0F from Sharp mesure with a triangulation method, the distance of an object at up to 1.5 meters. The analog output signal varies from 2.8V at 15cm to 0.4V at 150cm. This sensor has a 3-pin, 2.00mm JST connector.
This PIR motion sensor is easy to use. Just connect the JST (Grove) pins to a microcontroller, when anyone moves in its detecting range, the sensor outputs HIGH on the SIG pin. The detecting range and response speed can be adjusted by 2 potentiometers on board