HC-SR501 PIR Motion Sensor for Arduino & Raspberry Pi

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It’s hella sensitive I’m using it for an automatic trash can build and I have the screws all the way down and still have to put tape almost completely covering the sensor. But it works perfect with my arduino mini for sure! I will keep it.

arudinoで2か月使ってますが誤作動は特に起こっていないです。安くて良い商品

The pins on the back were exposed. I am surprised it didn't get damaged in shipping. That said, the unit arrived fine and is working as expected. Very easy to use and isn't any different from many, many other same sensors by different manufacturers. The library support is great online and easily found.The GND pin label is hidden so look up exactly where it is. I am using it with Raspberry Pi 4 and no special drivers are needed. Its a simple ON/OFF sensor and no digital modulation. For simple projects, it does the job 10/10.

I got this PIR motion detector for an Arduino project. It works as intended and I found it easy to use and adjust. The packaging could be better as the components on the back of the board are exposed and could easily be damaged in shipping.

It just works. If you like to tinker and have some spare PCB boards around, throw this on. It's low power draw and sensitivity is great. I've put a little motion sensor together to automate some lights with Home Assistant. Good price; you can find cheaper, but it's not going to arrive with the Amazon-backed 30-day return if you get a dud. If there's an issue, I usually want to address it and get back to tinkering quickly, so I'm willing to pay a bit more.

As a few other reviewers have noted, a software controllable adjustment would be an improvement but would increase the cost. So, you need to provide access to the pots if you need to change the sensitivity. The delay you can do similarly programmatically but that means the device may not be able to sleep as much if you're running on battery.

Simply packaging allows damage during shipping.The pins and some components are bent at an angle.The device is still functional.The device has an onboard 3.3 Volt regulator.It would be nice if there was a 3.3 Volt input pin along with the 4.5+ Volt pin.The trigger is 3.3 Volt when motion is detected.The device has two potentiometers, one for sensitivity and one for the trigger pin high duration.Also there's a jumper pin for the trigger mode.

Great module with built in adjustment can be used for a wide variety of projects in this configuration and is accurate in my tests

You couldn’t ask for more in the realm of ease of use but there is definitely something to desire in over-all function.its analo, offering a simple on/off output instead of a digital or resistance variable output. This is greater for easy setup but leaves something to be desired if for example you want different responsiveness programmed in to your system at different times of the day. It does the job for me so I’m happy.

Very easy to use. This design is really neat and you can make use of a thermistor and/or LDR to increase accuracy. This outputs 3.3V logic, not 5V+, so keep that in mind if you're going to use with a relay or something expecting 5V. There are lots of solutions for that though. Currently, I have this set up with a relay to control a lamp and it's been very fun to use.