Ultrasonic vs Infrared Sensors
| Ultrasonic | Infrared | |
|---|---|---|
| 👍 | Light conditions doesn’t matter | Easier to hide |
| No sound interference | ||
| 👎 | Sound interference | |
| Tend to be bulky and hard to hide | Tricky to use outdoors | |
| Close to |
A reed switch is another proximity sensor that will close in the presence of a magnetic field.