Lesson 8: Intermediate Logic & Algorithms – Smarter Code and Circuits

Lesson 8: Intermediate Logic and Algorithms – Circuits and Coding 101

📌 Introduction

Welcome back to Lesson 8 of Circuits and Coding 101! Today, we’re stepping into intermediate logic and algorithms.

This lesson will help you solve problems methodically and integrate more complexity into your circuits and programs.

🎯 What You’ll Learn Today

• Random numbers – Adding unpredictability to your programs
• Algorithms – How to process data and solve problems
• Multi-sensor integration – Using multiple inputs for smart outputs
• Interrupts – Making microcontrollers react instantly to external events

🎲 Random Numbers and Algorithms

Why use random numbers?

Random values are used in games, simulations, and creating unpredictable behavior in programs.

💻 Example Code:

📝 Introduction to Algorithms

What is an algorithm?

An algorithm is a set of step-by-step instructions to solve a problem.

📌 Example: Finding the Largest Number in an Array

Pseudocode:

1. Start with a list of numbers.
2. Assume the first number is the largest.
3. Compare each number in the list to the current largest.
4. If a number is larger, update the largest.
5. Output the largest number.

💡 Hands-On Exercise 1: Sorting Numbers with Bubble Sort

💻 Code:

🔗 Multi-Sensor Integration and Smart Outputs

Let’s combine a temperature sensor and a light sensor to create a smart control system.

🔧 Steps for Breadboard Setup:

• Connect a temperature sensor (e.g., LM35) to pin A0.
• Connect a photoresistor with a voltage divider to pin A1.
• Connect an RGB LED to pins 9, 10, and 11.

 Hands-On Exercise 2: Interrupt-Driven Buzzer

What are interrupts?

Interrupts allow the microcontroller to respond immediately to external events.

🔧 Steps for Breadboard Setup:

• Connect a button to pin 2 with a pull-down resistor.
• Connect a passive buzzer to pin 9.