Revision [24128]

This is an old revision of HCSR501 made by ToBo on 2017-01-18 00:28:18.

 

HC-SR501


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The HC-SR501 is a pyroelectric infrared detector. The main component is the BISS0001 PIR controller. The voltage is provided through a 3.3 V linear regulator HT7133 with a voltage drop of 100 mV. A minimum supply voltage is therefor 3.4 V. A absolute maximum supply voltage is specified by 24 V in the datasheet.



The HC-SR50 gives 0 V at the Out pin if no heat source is moving in fromt of the sensor. If a heat source is moving in front of the sensor, the Out voltage changes to 3.3 V for a time defined by the "hold time potentiometer". The can by modified sensitivity by a second potentiometer. A high sensitivity can cause false alarms. At low sensitivity events could be missed.

Further, the module can be changed from single to continuos mode by a jumper. In contineous mode pulses are given as long as a heat source is moving in front of the sensor.






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