Concept of PID explained

[eugenebrooks]

Originally Posted by billbo911

Curiosity question here.
I noted significant differences between your paper and the IFI documents when it came to variable types and their ranges, primarily "int". Again I'm pleading ignorance here as I'm so new to coding. Why are they different?

There are two tables in the paper. Table 1 is for EiC, the freely available
C interpreter used in the paper as a learning tool. Int is a 32 bit object
in EiC, with the associated signed and unsigned range. Table 2 is for
the C18 compiler used for the robot controller, where int is a 16 bit
type, with the associated signed and unsigned range. The text discusses
the issue. I hope that Table 2 is consistent with the data in IFI documents,
and the MPLAB C18 compiler documentation, it has been checked in
the past.

If you note a difference, please identify the document and page number.

[billbo911]

Originally Posted by eugenebrooks

There are two tables in the paper. Table 1 is for EiC, the freely available
C interpreter used in the paper as a learning tool. Int is a 32 bit object
in EiC, with the associated signed and unsigned range. Table 2 is for
the C18 compiler used for the robot controller, where int is a 16 bit
type, with the associated signed and unsigned range. The text discusses
the issue. I hope that Table 2 is consistent with the data in IFI documents,
and the MPLAB C18 compiler documentation, it has been checked in
the past.

If you note a difference, please identify the document and page number.

Sorry for the confusion. I did not look beyond Table 1. I assumed, and there lies the problem, that the first table I came across covered what I was looking for.

Either way, you were correct about the "int" declaration, it would have worked regardless which table I looked at.

Thanks again.

[DarKCroNo]

is there a way to apply this concept onto easy C? Sorry but it's our rookie year and we have no clue what we're in for, but basically we have gone for a design of 3 wheels, 2 being powered by a motor and running on an axle, and 1 in the front being steered by another motor, but the problem that arises is that after steering the motor to the left what I want to do is when the joystick is back at the centre position I would like the wheel to also move back into the centre position. I've been doing alot of research on PID closed loops, but all I've been getting is the theory behind it and I have no clue how to apply the programming for it. We went with easyC and I'm wondering if it works with it. Thanks in advance!