ajocius asked 6 years ago
What is most reliable motion detection sensor for use with ESP32? I tried only HC-SR505 module and even if it works, it is very unpredictable ( Used example from book “Micropython programing with ESP32”) . Often it does not detect movement even if I wave my hand right in front of it. It could be that motion detector is deffective, bought it cheap from aliexpress. Do you have other experience with it? Ordered HC-SR501, but it will be 4-5 weeks before I get it. I see there are also AM312, SR602 perhaps some other ? What is recommended to use?
Rui Santos Staff answered 6 years ago
I’ve been using the HC-SR505 in all my projects and it’s been proven to be very reliable for me. Did you try with different sensors or you only have one?
ajocius answered 6 years ago
I only had one sensor. Have ordered new one . Also ordered HC-SR501, think that is the one you used in the example in your book.
It would nice to hear your opinion about microwave sensor, those are supposed to be more reliable? I ordered RCWL-0516 sensor as well to test it hope. Hope it can be wired same way as your described HC-SR501 model.
Rui Santos Staff answered 6 years ago
I’ve never used the RCWL-0516 sensor, but those PIR sensors that I use have been working reliably for me.
Note: when the HC-SR505 detects motion, it’s HIGH for a couple of seconds. This means that if you try to trigger it multiple times in a row, nothing will happen (first, it needs to go LOW, so it can be triggered again). This is actually a good thing, because it will not send you unnecessary false warning. I’m not sure if this is what’s happening to you and you think it’s not working correctly.
ajocius answered 6 years ago
Sometimes it reacts to movement, then LED will turn on and stay on for 10 sec. I wait until LED is off, it must be low then.I do movement and nothing happens, LED stays off. Also sometimes it turns on without movement. I have covered it, so that it could not see any movement, but still LED was turning on and off…
Rui Santos Staff answered 6 years ago
That’s definitely a weird behavior that shouldn’t happen. I’m not sure if it’s something in your workspace that might be causing interference (triggering the PIR) or it’s simply a bad sensor that is causing those problems.
As I said in my previous comment, when the HC-SR505 detects motion, it’s HIGH for a couple of seconds. So, you can’t trigger it multiple times in a row… But it shouldn’t be triggered without any movement.