PIR motion activated cat toy

HC-SR501: a cheap 0.70$ PIR motion sensor

replaced the onboard 15kOhm output resistor with a wire.
the onboard PIR IC “BISS0001” has a maximum output current of 10mA at 5V. a bit less if, like the HC-SR501, driven at 3.3V.
the output voltage is 3.3V as well.

the PIR sensor activates a stepper motor driver i’ve built a few years ago.


a small and long tube of heatshrink attached to the stepper motor works quite nicely. the cat can’t tear it apart because it’s slippery.

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