Codezlab Blog

Practical notes for software clients, students, and local technology learners.

Ideas from our work in development and education, written for people who want simple answers and useful next steps.

ESP32 home automation with 4-channel relay and Android app

IoT

ESP32 Home Automation — 4-Channel Relay, RGB LED & Android App over WiFi

Control lights, fans, and appliances from your Android phone over local WiFi. No cloud, no subscription — just your ESP32 and a simple app built in MIT App Inventor.

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ESP32 and RC522 RFID module wired on a breadboard — Codezlab build

IoT

Build an ESP32 RFID Attendance System with RC522, Buzzer & RGB LED

Learn how to wire an RC522 RFID reader to an ESP32, add RGB LED and buzzer feedback, and build a working attendance tracker with a full code walkthrough.

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Team discussing a software project

Software Development

How to decide what custom software your business needs first

Start with the repeated work, delayed approvals, missing records, and customer touchpoints that cost your team the most time.

Discuss your project
Student learning on a laptop

Computer Education

A beginner path from basic computers to programming

Students learn faster when they build confidence with the machine first, then move into HTML, CSS, JavaScript, Java, and Python through small projects.

View learning path
Business owners reviewing website work

Websites

What makes a professional website useful after launch

A good website should explain your offer, earn trust, guide enquiries, and stay easy to update as the business grows.

See website services
Electronic circuit board for IoT learning

IoT

Why IoT is a practical next step for curious students

IoT helps students connect software with real devices, sensors, automation, and problem solving they can see working in front of them.

Explore IoT learning