Home · Wiring · Installation · Troubleshooting

LED–LDR Feedback Control Lab

A hands-on feedback control experiment using an LED (actuator), the environment (plant), and an LDR voltage divider (sensor), controlled via MATLAB and Simulink with an Arduino.

Start here: If this is your first time, do the steps under Quick start.

---

Quick start (5–10 minutes)

1. Wire the kit → see Wiring
2. Install MATLAB support package → see Installation
3. Run Blink: matlab/Blink_led.m
4. Run Sensor check: matlab/LDR_sanity_check.m
5. Run PI control (script or GUI):
   • matlab/PI_led_control.m
   • matlab/Led_ldr_pi_gui.m

---

What’s in this toolbox

MATLAB (scripts + GUI)

• Blink / Fade: verify actuation + PWM intuition
• LDR sanity check: verify measurement + ambient disturbance
• PI control (+ filter): closed-loop behavior + tuning + noise filtering
• GUI: real-time interaction for students

Simulink (hardware-in-the-loop)

• Full block-diagram loop using a MATLAB System block plant
• Uses ArduinoLedLdrPlant.m inside a MATLAB System block

---

Documentation

• Wiring
• Installation
• Troubleshooting
• Repository overview

---

Links

• GitHub repository: https://github.com/zondervanedwin-collab/led-ldr-feedback-control
• Course/lab notes