Analog PID Controller

About

• Analog PID controller from scratch to regulatae LED brightness
• Built as one of my college projects for 3rd year Computer Engineering
• Designed and fabricated a reusable PID controller PCB with flexible input, output, and plant connection interfaces
• Prject strengthened my hardware skills from: soldering and PCB design to proteus simulation and electronics circuit design

System

• PID Controller: using x6 741 op-amps to construct Proportional, Integrator, Differentiator, Summator and Difference circuits
• Input Potentiometer: to set reference voltages allowing more control for user
• LDR acting as feedback circuit, measuring led intensity and outputing measurement back to PID controller input
• LED acting as plant to control its intensity according to desired reference input

TeamWork

• Youssif Sameh
  
• Mohamed Mamdouh Sayed
  
• Mohamed Elansary
  
• Bishoy Kamel
  
• Salma Ramadan
  

challenges

• Understand PID behavior and how to tune it
• Design analog circuit using op-amps and choose the correct component values for best stability
• Deal with noise, non-idealities and real-world constraints

Simulation & Tuning Work

• We modeled the system mathematically on Matlab with parameter sweeps for: proportional gain (Kp), Integral gain (Kv), Derivative gain (Kd)
• Studied: rise time, settling time, overshoot, damping, stability margins

Behind The Scenes

Proteus schematic

Block Diagram

Matlab

Proteus PCB Design

PID Controller PCB