HC-SR501 Human Sensor Module Pyroelectric Infrared
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- Borad PCB Size:3.7x2.5x2cm(1.46x0.98x0.79inch)
- Startup Time:2 Seconds to get a measure on room volume
- Working Voltage :5V(DC)- 20V; Current drain:60uA
- Material:High quality electric part
- Leegoal bulk packing with good quality warranty.
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|Sold By||Available from these sellers||J-DeaL||RobotDyn||Monoprice||Jameco Electronics||SENSKY|
|Item Dimensions||1.26 x 1.02 x 0.94 in||1.26 x 0.6 x 0.94 in||3.15 x 1.57 x 1.18 in||3.25 x 4 x 2.2 in||1.41 x 1 x 0.8 in||6.1 x 2.7 x 5 in|
100% brand new Leegoal brand items,show as pictures.
The sensitivity and holding time can be adjusted.
Detection distance:3--7M(can be adjusted).
Work temperature:-15 to +70 degrees.
Color:show as pictures.
What is in the package: 1 x HC-SR501 Human Sensor Module
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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.
This is a really nice module to have if you want to learn how a Pyroelectric Infrared sensor works.
Due to the fact that this senses Infrared radiation, light shining directly on the module will cause it to send a signal as if a human were actually there when in reality it isn't.
It is best recommended if you position the sensor facing away from light for better results.
It does not come with any instructions on how to use this but it is straight forward:
Using the conventional current theory, you'd want to connect the POSITIVE terminal to Vcc pin and the NEGATIVE terminal to GND pin. The OUT pin is the signal pin where the sensor will tell you if it detects a human.
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:
Pros: It works fairly accurately.
It can be modified for different sensitivity levels, making it a bit more practical
Cons: Poor design.
Need famle-to-male breakout to work properly
Plastic dome falls off too easily
needs 5 volt or more, very sensitive and sometimes just activates by self
either a mistake of my part or the module doesnt work properly or is to sensitive
ive tried setting the intensity and duration on the screws but didnt do much