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limit_switch [2018/10/29 05:57] admin created |
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| + | ====== Limit Switch ====== | ||
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| Limit switches are used to detect when some mechanism has hit some form of limit. For instance, a limit switch would be used to detect when an elevator is at its lower limit or when an arm is at its maximum angle. | Limit switches are used to detect when some mechanism has hit some form of limit. For instance, a limit switch would be used to detect when an elevator is at its lower limit or when an arm is at its maximum angle. | ||
| To [[Designing for Control|design for controllability]], every mechanism that has a limit should have a limit switch on it. Ideally, there should be at least one limit switch and a [[Quadrature Encoder]]. | To [[Designing for Control|design for controllability]], every mechanism that has a limit should have a limit switch on it. Ideally, there should be at least one limit switch and a [[Quadrature Encoder]]. | ||
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| - | Other limit switches use the Hall Effect, which allows the detection of a strength of a nearby magnetic field. These consist of two components. First is the magnetic, which typically sits on the moving mechanism. The second is the [[Hall Effect Sensor]], which will stay on the static part of the mechanism. Internally, the Hall Effect Limit Switch will convert the analog Hall Effect into a digital output that behaves similarly to a mechanical limit switch. | + | Other limit switches use the Hall Effect. These consist of two components. First is the magnet, which typically sits on the moving mechanism. The second is the [[https://en.wikipedia.org/wiki/Hall_effect_sensor|Hall Effect Sensor]], which will stay on the static part of the mechanism. Internally, the Hall Effect Limit Switch will convert the analog Hall Effect into a digital output that behaves similarly to a mechanical limit switch. |