Week 10: Output Devices

1. Introduction

Output devices allow a microcontroller to act on the physical world. They convert digital signals into physical actions such as light, motion, or sound. In this assignment, I worked with an RGB LED to understand how output control works in embedded systems.

2. Group Assignment

We measured the power consumption of an output device using a multimeter.

• Measured voltage using multimeter
• Measured current in the circuit
• Calculated power using P = V × I
• Analyzed energy usage of output devices

3. Output Device Used

• RGB LED (Red, Green, Blue control)
• Controlled using PWM signals
• Directly connected to microcontroller board (no breadboard)

4. Workflow Process

1. Circuit Connection

The RGB LED was connected directly to the microcontroller output pins.

2. Programming the Output

I programmed the microcontroller to control color changes using PWM signals.

3. Testing Output

The LED changed colors based on the programmed sequence.

5. How the Code Works

The code uses PWM (Pulse Width Modulation) to control the brightness of each RGB channel. By adjusting duty cycle values, different colors are created by mixing red, green, and blue intensities.

6. Learning Outcomes

• Understood how output devices work with microcontrollers
• Learned PWM control for LEDs
• Measured power consumption of electronic devices
• Improved hardware and programming integration skills

7. Lessons Learned

I learned that output devices require proper current control and correct programming to function safely. I also understood how power consumption is measured and how different output levels affect energy use.

8. Conclusion

This assignment helped me understand how microcontrollers control output devices and how electrical power is used in real systems. I gained practical experience in programming, circuit design, and power measurement.