Timeline for what is the easiest way to make a gate that detects if something passes through a gap?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Oct 8, 2020 at 8:58 | comment | added | Ralph | And as you mentioned, smaller modules are the perfect solution for many applications. | |
| Oct 8, 2020 at 8:52 | comment | added | Ralph | There isn't enough enough information to give the exact answer. LEDs and photodiodes/-transistors are the DIY option if you want to learn electronics. If this is a serious industrial application I'd probably go with a light curtain or some other laser based industrial sensor. | |
| Oct 7, 2020 at 15:13 | comment | added | Chris Stratton | @DKNguyen no, use an IR receiver module which looks for light pulsed at a particular frequency. But the object will probably not block enough of the beam. | |
| Oct 7, 2020 at 15:11 | comment | added | DKNguyen | Use a phototransistor for this instead of a photodiode, an opaque black visible immune one. Much simpler. | |
| Oct 7, 2020 at 15:06 | comment | added | Chris Stratton | A simple photodiode interpreted by level is unrealistically primitive; to work over this range in the open the light source should be switched and a receiver which specifically detects that switching used. Affordable ultrasonic solutions will not work over this short a distance unless the sensor can be offset from the start of the detection window - there's a minimum detection distance to account for ringing of the transmitter. | |
| Oct 7, 2020 at 15:00 | history | answered | Ralph | CC BY-SA 4.0 |