PIR sensors

[last updated: 2019-05-31]
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• PIR: "Passive InfraRed" sensor
  ie. Motion sensors

• The first one I got was from Adafruit, PID: 189


Adafruit PID: 189


Adafruit 189


Adafruit 189 adjustments
• time-delay adjustment:
  This is the time between sensing and output firing
  full-CCW was shortest at ~ 7 sec
  turning CW less-than 1/8 turn raised delay to ~ 30 sec

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• This one is a "mini-PIR" from Banggood, a Chinese importer


PIR-mini


PIR-mini Specs
• output goes high upon sensing motion
• "delay time: 2 seconds":
  is the time that the output stays high after motion is sensed and then stops.
  That is, the delay time countdown Starts when motion stops.
  If repeatedly triggered by constant motion, then delay time countdown will not start, and output will stay high.
  Output will only go low after motion has ceased and delay-time has expired
• "blocking time: 2 seconds"
  is the time after output goes low before it can be re-triggered
  (output goes low after motion has ceased and "delay time" has expired)
• when powered with +5v, output is +3v when triggered.
• output drive current minimal. Could not find a spec sheet, but it's not enough to drive an opto-isolator, even without a current limiting resistor.
  It will drive an Arduino input, but I used a transistor switch.

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• This one is a "HC-SR505", also from Banggood, a Chinese importer


PIR-mini


PIR HC-SR505 Specs

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