Where is the variable $adcSpecified getting it's value from? Is it set in another script?... You are going to get an error if you haven't specified $adcSpecified at least in another or same script first... your first two lines in your script don't do anything, what do you need them?

if ($adcSpecified = 135) (Get error "variable not defined on this line ")

endif

#what does the above supposed to do?

Is this what you wanted? If so it should work now...

 $adcSpecified = 135
 :start

$adcCurrent = GetADC(adc7)

if ($adcCurrent $adcSpecified)
 goto( Right)
endif
if ($adcCurrent = $adcSpecified)
 goto( Stop)
endif
goto(Start)

: Left
Set(d23, on)
Set(d22, off)
Return()
: Right
Set(d23, off)
Set(d22, on)
Return()
: Stop
Set(d22, off)
Set(d23, off)
Halt()

Thanks Richard Ah so thats where the $adcspecified comes from I presumed one entered a value on that script must experiment a little more so I can then enter my varing $adcspecified

Richard Thank you so much that worked this is the working version that may be of use to others.You are a genius at programming. Any pointers how one could get this script to accept a varing "$adcspecified "

$adcSpecified = 145 :start

$adcCurrent = GetADC(adc7) if ($adccurrent > $adcspecified) goto(left) endif if ($adcCurrent < $adcSpecified) goto( Right) endif if ($adcCurrent = $adcSpecified) goto( Stop) endif goto(Start)

: Left Set(d22, on) Set(d23, off) Return() : Right Set(d22, off) Set(d23, on) Return() : Stop Set(d22, off) Set(d23, off) Halt()

Dude, I am no genius by any means, but thanks... Maybe you could use a slide script control to pass your required value to $adcSpecified ...Just change the default value in slide scrip from $SlideValue to $adcSpecified... Now when you move the slider in the control it will change your values automatically...

note you will need to get rid of this line ($adcSpecified = 145) if you use the slide script... The slide script will provide your value from now on....

Check the topic Gwen started about needing help with custom movement scripts. Have a look over the project I made for ramping the speed of the sabertooth and check out how I used a script which would accept variables which were set elsewhere.

Basically, a main script which did the thinking, calculations, movements etc. which was triggered by a different script. The second script would first specify the variables, i.e. set the speeds for the motors then it would run the script which sent the commands to the sabertooth to gradually increase the speed of each motor until they reached the desired speeds.

Similar could be done with this. A script which moves the motor on the H-Bridge until the Pot on the ADC port reads the required value. That script is triggered by a different script using ControlCommand after specifying the desired position.

For accurate positioning you may need the script which monitors the pot on the ADC port to check very quickly (depending on motor speed) though which may cause comms bottlenecks and increased CPU load. It may end up needing to be a bit of a compromise in areas.

@Bravia, Off topic, but I know you will be following this thread. Last year, there was a long discussion about how a robot could return to a charging location and plug itself in. I think you were the closest to actually building a working solution. did you ever complete that?

Alan

Alan Shall i say I was part of a discussion group that put forward ideas I experimented with a polou ir beacon ( www.pololu.com/product/701) which works well indoors Its built into the upper part of" robot leonardo " which is pictured on my logo

Will demo some of its features once I have completed my present project Pat