Create an audible warning for a restricted area. Audible reminders or procedures to assist people with Dementia. Audible security alarms. Create a special door entrance greeting. Raise attention and create impact by adding a speech, music or sound effects to a point of sale display.
What is PIR?
PIR stands for Passive Infrared. A PIR Sensor is an electronic sensor that measures infrared light radiating from objects in its field of view. All objects with a temperature above zero emit heat energy in the form of radiation. Usually this radiation is invisible to the human eye because it radiates at infrared wavelengths, but it can be detected by PIR Sensors. PIR sensors don't detect or measure heat, but instead they detect the Infrared radiation emitted from an object. A PIR-based motion detector is used to sense movement of people, animals, or other objects. They are more commonly used in burglar alarms and automatically-activated lighting systems.
What is the difference between normal Motion Sensors and PIR Sensors?
PIR Sensors do not detect motion, instead they detect abrupt changes in temperature at a given point using the Infrared radiation level. As an object, such as a human, passes in front of the background, such as a wall, the temperature at that point will rise from room temperature to body temperature, and then back again. This quick change triggers the detection.
Playback calculations based on the 4MB of memory
A playback time of 8 minutes can be achieved with an MP3 file that has a Bitrate value of 64Kbps.
A playback time of 4 minutes can be achieved with an MP3 file that has a Bitrate value of 128Kbps.
A playback time of 2 minutes can be achieved with an MP3 file that has a Bitrate value of 256Kbps.