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Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Touch Sensor This lesson will explain how to hook a standard micro switch into the Vex system to function.

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Presentation on theme: "Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Touch Sensor This lesson will explain how to hook a standard micro switch into the Vex system to function."— Presentation transcript:

1 Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Touch Sensor This lesson will explain how to hook a standard micro switch into the Vex system to function as a custom digital sensor -Vex offers a limited selection of sensors that are optimized to work with the system -Don’t let this limit your creativity -Off-the-shelf sensors and electrical components can be adapted to work with the Vex system -Adapting off-the-shelf components is different in every case; you should take all the necessary precautions and be sure to understand the electrical behavior and requirements of each device before attempting to use it

2 Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Materials Needed Basic components –Limit switch –3-wire cable (12") OR two single wires –Wire stripper Soldering –Soldering pen –Solder –Vice Crimping –Male Molex pins (3) –Molex connector (1) –Crimping tool

3 Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. The Limit Switch as an Electrical Switch The Limit Switch either connects or disconnects two terminals electrically –The switch has 3 terminals, but only uses two here –COM (sometimes marked GND or ) establishes the electrical ground voltage –The NO ("Normally Open") terminal is electrically disconnected from the COM terminal when the switch is open, and connected when the switch is closed

4 Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Limit Switch as a Digital Sensor The voltage at the NO terminal can be used as a digital signal to determine whether the switch is closed or not –NO terminal voltage will default to HIGH (+5V) if the switch is not closed –Closing the switch changes the NO terminal voltage to LOW (0V = ground) –HIGH is a digital 1, LOW is a digital 0

5 Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Solder Limit Switch Terminals Set LOW voltage: Black wire to COM terminal Set output voltage: White wire to NO terminal NC terminal and Red wire are unused

6 Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Crimp 3-Wire Connector This end of the cable will be plugged into the Micro Controller Create a standard 3- pin Molex connector –Wire order must be Black-(Red)-White –Red cable may be omitted because it is not used

7 Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Plug In to Micro Controller Plug the crimped connector into the Micro Controller –Analog/Digital port bank in an Digital Sensor Port –Port 5 is set this way by default –Black wire must go on the same side as black wire on regular Vex connectors

8 Vex 1.0 © 2005 Carnegie Mellon Robotics Academy Inc. Load Online Code to Test Connect the micro controller to the PC and turn it on In easyC: –Build & Download menu –On-Line Window –Download On-Line Code Push the switch arm and watch “Digital Input 5” change


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