We currently have an arm, powered by a motor (port 1). It is attached to a potentiometer, in slot in1.

I am trying to use this code:


Here is where the problem arises. Apparently the motor value needs to be a constant, and I have no idea how to even make that work.

Basically, what my code does is when the arm tries to reach target height 1000. Starting when it is 150 ticks close, it slows down until it has a force of 0 when it reaches the target position.

There are a few rubber bands pulling it up so we don't have to worry about the motors having 1 force and not being able to move the arm up, and we don't care (right now) if the arm goes over the height, but the main priority is just to figure out how to get this working.

Thanks,
1622

Apparently the fix was to define another variable as 1000-sensorvalue[in1], and have it directly multiply and divide:

changedsensorvalue*127/150 works just fine.

Any ideas why?

This is the same issue I ran into on this thread: viewtopic.php?f=11&t=5309

Let's say that SensorValue[in1] is 925.
Then, the robot evaluates the statement like so:



Now, to perform the multiplication, ROBOTC casts the decimal to an integer. This basically means that ROBOTC truncates the decimal values. Now, we have:



There is a minor bug in the compiler that doesn't like this (see linked thread).

A fix to your line of code would be (note lack of parenthesis):

to evaluate the division as a float, you can also do:

Or cast one of the numbers to a float: