Vex CORTEX Manual de Instruções descarregar pdf (Página 125)

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Sensor

Inventor’s Guide

276-2178-E-0610

Limit Switch Sensor

Signal: Digital

Description: The limit switch

sensor is a physical switch. It

can tell the robot whether the

sensor’s metal arm is being

pushed down or not.

Technical Info:

Type: SPDT microswitch,

congured for SPST

Normally Open behavior.

Behavior: When the limit

switch is not being pushed

in, the sensor maintains

a digital HIGH signal on

its sensor port. This High

signal is coming from the

Microcontroller. When an

external force (like a collision

or being pressed up against a

wall) pushes the switch in, it

changes its signal to a digital

LOW until the limit switch is

released. An unpressed switch

is indistinguishable from an

open port.

Note: You can connect

multiple switches to the

same port using a y-cable.

PIC Microcontroller Default

Code Behavior Info:

Usable Ports: Analog/Digital

1-8 (Limit Switch Behavior),

9-10 (not recommended),

11-12 (Autonomous Behavior)

For more info, see

Programmed Behaviors later

in this section.

Limit Switch Sensor

Concepts to Understand, continued

Pushing switch brings the signal pin voltage to LOW

N. O. Terminal

(Signal pin on wire)

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