My PIR sensor continuously blinks the output when activated once, how do I fix this?

I tried it on both settings (retriggerable and non) and it still does it.
am I doing something wrong?

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It says it only has a TTL output, that isn't usually capable of driving an LED directly. You should try using a transistor to switch the load.
iceng4 years ago
Please show the circuit schematic of how you are using it so we can talk to you about it.

Or a part number for the PIR sensor..

Sun Gear (author)  iceng4 years ago
im using this,

i have 4.5v going in and the led has a 200ohm resistor on it going from the out put to ground
iceng Sun Gear4 years ago
That module is manufactured by Parallax  and here is the real data sheet
which looks like Rev_A.

If properly calibrated the output goes HIGH when movement is detected
and low when NO_Movement.
Rev_A that is output pin_3..
The output should drive a MOSFET like a 2N7000 available for 7¢..

The S wire goes to ground, the D wire goes to LED and resistor goes to any
voltage 4.5v , 5v , 9v or 12volt..  The Gatewire goes to the PIR output pin_3.


Sun Gear (author)  iceng4 years ago
found it on new egg
iceng Sun Gear4 years ago
If you click on the red word Parallax or this  it will take you to a deal on
an older revision  of A.
Sun Gear (author)  iceng4 years ago
a 3904 seems to do the job! thanks so much for the help, took me a while to figure it out (i was quite tired yesterday).
Sun Gear (author)  iceng4 years ago
would a 3904 transitor do the job?
Sun Gear (author)  iceng4 years ago
that doesn't look like the motion sensor i have, and the pin outs are different
Check your power supply can handle the PIR without the voltage drooping.

Sun Gear (author)  steveastrouk4 years ago
3 AA batteries
frollard4 years ago
Something is causing it to go off after it resets -- are you 100% sure there is no motion or heat signature?
Sun Gear (author)  frollard4 years ago
yeah, it only stars blinkingg once a i activated it by waving my hand in front of it