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HC-SR501 Human Sensor Module Pyroelectric Infrared

4.3 out of 5 stars 115 customer reviews
| 18 answered questions

Price: $3.25 + $0.99 shipping
In stock.
Usually ships within 2 to 3 days.
Ships from and sold by Docooler.
  • human sensor module
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  • HC-SR501 Human Sensor Module Pyroelectric Infrared
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$3.25 + $0.99 shipping In stock. Usually ships within 2 to 3 days. Ships from and sold by Docooler.

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  • HC-SR501 Human Sensor Module Pyroelectric Infrared
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Technical Details


Product Description

Product Type: HC--SR501 Body Sensor Module Operating voltage range: DC 4.5-20V Quiescent Current: <50uA Trigger: L can not be repeated trigger/H can be repeated trigger(Default repeated trigger) Delay time: 5-200S(adjustable) the range is (0.xx second to tens of second) Block time: 2.5S(default)Can be made a range(0.xx to tens of seconds) Board Dimensions: 32mm*24mm Angle Sensor: <100 ° cone angle Lens size sensor: Diameter:23mm(Default)

Product Details

  • Product Dimensions: 1.3 x 1 x 0.9 inches
  • Shipping Weight: 0.3 ounces (View shipping rates and policies)
  • ASIN: B007XQRKD4
  • Item model number: HC-SR501
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (115 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: April 26, 2012

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Customer Reviews

Top Customer Reviews

Verified Purchase
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.
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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.
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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!
7 Comments 81 of 85 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Good price for a project motion sensor, but came with zero documentation and no jumper for the mode selection header. If you need documentation, instructions or specs, do a web search for DYP-ME003.
Comment 22 of 23 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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This item has several model names and different variations.

There's a voltage regulator that accepts voltages from 5 to 24vdc.

At 5vdc it takes about 60micro amps. I'm running this on 12vdc and at that voltage it uses about 76micro amps.

The middle pin, output, puts out 10mA and 3.3vdc. so if you connect a green LED from the output pin to ground (negative), you'll see a dim glow when you put your hand in front of it.

You can directly drive an NPN transistor.

If you move around in front of the unit, it sends out an "on" pulse, then off. Even if you keep on moving it will still shut off. After a few seconds, it will switch on again if you move. So its on again, off again. Think of those annoying public toilet sinks that are "touchless". So if you want this to be a bathroom light for example, you'll need a separate timer - think of something similar to a computer screen saver, as long as you keep moving your mouse.

Here's one being powered up:
[...]
[...]
3 Comments 22 of 24 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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I chose this rating because the PIR sensor works well enough for the price, but I dinged it because it doesn't come with any sort of documentation.

Mine came with the jumper and the pots aren't crazy exact, but they work for me since I am just learning about electronics.

If you are going to use this with an Arduino I highly recommend you either get header stackers and/or male-female breadboard cables. A hacked servo extension cable would work too. The capacitors that come on the board make it impossible to attach this to your breadboard/Arduino without modification.
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loved it once I found the documentation and some code, this site has a great wiki on the sensor and some code to boot.

[...]
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I have it connected to an Arduino uno r3 setup and it functions perfectly. triggers nicely and very quick. Nice distance range on it as well. The quality is exactly the same as the other sensors just at 1/3 the price. Cannot compare directly for the osepp sensor though but having the pins in the rear means being able to flush mount.
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