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Touch Sensor not working?

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Touch Sensor not working?

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jecanion

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Joined: Fri Feb 15, 2013 5:01 pm
Posts: 1

Touch Sensor not working?

Using the touch sensor as run switch to execute code after download
VEX PIC
Please review code
thanks


	Attachments: File comment: Review basic code compile just will not respond to logic? Moving Forward-wait-jc.c [2.76 KiB] Downloaded 47 times

Fri Feb 15, 2013 5:47 pm

JohnWatson

Site Admin

Joined: Thu May 24, 2012 12:15 pm
Posts: 386

Re: Touch Sensor not working?

For reference;

This particular issue was caused by the second while loop not having any braces to encapsulate which code it should control.


	Code: while(SensorValue(touchSensor) == 0) // Instructs robot to do nothing while the touch sensor isn't pressed { } wait1Msec(250); // Wait just a bit before moving on (to help touch sensor remain consistant while(SensorValue(touchSensor) == 1) // Loop while robot's bumper/touch sensor IS pressed in motor[frontRightMotor] = 127; // Motor on port2 is run at full (127) power forward motor[backRightMotor] = 127; // Motor on port3 is run at full (127) power forward

If there aren't any braces following a loop or if statement's condition, the loop or if statement will look for the next single line of code to 'control', in this case the 'motor[frontRightMotor] = 127;' command. So, instead of doing nothing while the touch sensor was pressed (which was the intention of the program, to have a 'wait until bump' command to start the program) the program would turn on the frontRightMotor at a power level of 127.

The correct code is:


	Code: while(SensorValue(touchSensor) == 0) // Instructs robot to do nothing while the touch sensor isn't pressed { wait1Msec(10); // This is for debouncing; it can be lowered down to 5~10ms without any side effects } while(SensorValue(touchSensor) == 1) // Loop while robot's bumper/touch sensor IS pressed in { wait1Msec(250); // This is for debouncing; it can be lowered down to 5~10ms without any side effects } motor[frontRightMotor] = 127; // Motor on port2 is run at full (127) power forward motor[backRightMotor] = 127; // Motor on port3 is run at full (127) power forward

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Mon Feb 18, 2013 12:14 pm

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