Doktor Jones
Member
At work, we have a solid door that opens outward; unfortunately this means that if someone inside is heading out while someone else is outside fumbling for their keycard, they end up getting a door to the face. As a relatively inexpensive solution I was thinking of mounting a PIR sensor on the ceiling directly above the door on the outside and wiring that to a bright LED inside the door, so that the LED lights up whenever someone is within about 3 feet of the door.
With a 4V power source (regulated by a LM317L TO-92), could I just wire the LED directly to the output of this PIR sensor (with limiting resistor of course)? Or would I need additional electronics?
Does anyone know if this sensor outputs a "heartbeat" pulse? I've seen some other datasheets that indicate that the sensors periodically pulse high on the output (undesirable for my circumstances), so if that were the case I imagine I'd have to add a small timer circuit that only triggers the LED if the output is high for greater than the length of the heartbeat pulse.
Thanks!
With a 4V power source (regulated by a LM317L TO-92), could I just wire the LED directly to the output of this PIR sensor (with limiting resistor of course)? Or would I need additional electronics?
Does anyone know if this sensor outputs a "heartbeat" pulse? I've seen some other datasheets that indicate that the sensors periodically pulse high on the output (undesirable for my circumstances), so if that were the case I imagine I'd have to add a small timer circuit that only triggers the LED if the output is high for greater than the length of the heartbeat pulse.
Thanks!