Where to Buy HC-SR501 Human Sensor Module Pyroelectric Infrared

Product Description

HC-SR501 Human Sensor Module Pyroelectric Infrared

Product Details

• Model: HC-SR501
• Dimensions: .94" h x 1.02" w x 1.26" l, .3 pounds

Features

• human sensor module
• pyroelectric infrared
• high quality
• fast ship with usps

Customer Reviews

Most helpful customer reviews

42 of 42 people found the following review helpful.
Love how it doesn't have a darn red glow when it senses motion
By M. Diehl
I bought this one and one by Parallax. The Parallax one (which was more expensive) had 2 settings. Low and High sensitivity. This one has a pot that controls the sensitivity and another for the timeout (according to another post). The thing I like most is that the white globe does not turn bright red like the Parallax. I'm using this for something more discrete where a glowing-red-light would distract from the work.

37 of 40 people found the following review helpful.
Inaccurate Description, no documentation
By BuzzAndy
The documentation for this item is incredibly hard to find. The "HC-SR501" name describes the actual sensor component (vs. the whole board), so that doesn't help much. A more complete spec is here:

[...]

It's for the DYP-ME003 sensor module that incorporates the HC-SR501 sensor.

There are 2 potentiometers (one that sets the distance btw 3M-7M), another to set the timing delay (5s-300s). On this specific item, however, there is NO JUMPER to set the trigger mode.

I hooked this up to my Arduino Uno, and found that the potentiometers are not that accurate, so this is only good for very rough applications vs. anything that you might want to use that requires reliable distance sensitivity.

That being said, it's pretty inexpensive, so worth it if you just want to mess around. If you truly need "distance sensing", go for the HC-SR04 ultrasonic sensor that gives really accurate distance...or maybe tie them together?

Happy Making!

17 of 17 people found the following review helpful.
Extremely reliable, great price
By Jason Wright
As a novice in the embedded field, I struggled to get this working at first. I set up my arduino to check the signal from the sensor every 50ms, and there appeared to be many false-positives returning from the sensor.

I later realized that the sensor will output HIGH on occasion just to signal that it is still active. Under a constant stream, the output looks something like: "0000000000111100000000001111" always with 4 HIGH in a row.

In my loop that checks if the sensor is actually "tripped" I simply checked for combinations of HIGH in groups more than 4. This has been working flawlessly for the last few months, and I have absolutely no complaints.

See all 21 customer reviews...