https://github.com/sadrasabouri/pid
PID controller for Atmega32
https://github.com/sadrasabouri/pid
Last synced: 2 months ago
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PID controller for Atmega32
- Host: GitHub
- URL: https://github.com/sadrasabouri/pid
- Owner: sadrasabouri
- License: mit
- Created: 2021-07-03T05:08:23.000Z (almost 4 years ago)
- Default Branch: master
- Last Pushed: 2021-07-09T17:55:22.000Z (almost 4 years ago)
- Last Synced: 2025-03-28T07:22:35.434Z (3 months ago)
- Language: C
- Size: 504 KB
- Stars: 3
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# PID
PID controller for Atmega32
## Developers
+ [Omid RostamAbadi](https://github.com/omidrostamabadi)
+ [Sadra Sabouri](https://github.com/sadrasabouri)
## Main Process
PID controller details have been came bellow:
+ Changeable coefficients for `P`, `I` and `D`
+ Each coefficient should be edited by user between `0` and `16`
+ Working point can be set by user from `0` to `2.56` Volts.
+ Sampling time should be `20ms`
+ Input signal has a amplitude between `0` and `2.56` Volts.
+ Output is a 8 bit number on Port C showing a value between `0` - `2.56` Volts
+ When Atmega32 is not working on PID coefficients it work as a timer and increase a value which is on `200H` to `205H` of RAM.
+ When system starts it'll be reset and counter will become 0
+ After 16 mins 5 byte of counter will be sent to Port D in a little-endian mode.
P, I and D coefficients and set point are loaded into ROM by user and AVR will load them into it's memory after execution.
| Value | Place on ROM |
|:---------:|:------------:|
| P | 20 |
| I | 21 |
| D | 22 |
| Set Point | 23 |
Then after each iteration (taken each 20ms) the error will be calculated from bellow equation:
```
error = error - pv;
```
(that `pv` stands for present value of the system)
Then new output will be calculated by bellow equation:
```
output = k_p * error + k_i * integral / SCALE + k_d * derivative * SCALE;
```
(in that terms are representing P, I and D segments respectively)
The output value will be shown on a 10 pin compact LED (as there is in picture).
Also there is a timer which uses AVR's timer as a interrupt source and counts each second saving its content in bellow RAM bytes:
| Value | Place on ROM |
|:---------:|:------------:|
| Seconds | 0x200 |
| Minute | 0x201 |
| Hour | 0x202 |
| Day | 0x203 |
| Week | 0x204 |
| Month | 0x205 |
These values will be updated in each second and there will be sent to `PORTD` as a big-endian manner after each 16 minutes.
## Develop
You should use Proteus 8 and WinAVR compiler so that you can open `main.c` code in `Source Code` tab by right click on ATMEGA32 and click on `Edit Source Code`.
## Files
This repository contain multiple files which is described here in details:
+ `test.c`
A C program for first test of the PID controller and check if the logic is right. To compile it you can simply run:
```
$ gcc test.c
```
+ `PID.pdsprj`
Main project file which contains both schematic and codes needed for project.
Note: You should use Proteus 8.9 or bellow and WinAVR for compile.