Read an RFID card’s UID with the RC522, match it against your allowed list, and switch a 12V lock through a relay module – plus the honest truth about how secure it really is.

Build a DHT11 temperature and humidity monitor with a 0.96-inch OLED on an ESP32 – full wiring table, one runnable sketch, and no extra resistors needed.

Ten RBT electronics project ideas for Form 1-3, sorted by difficulty – from a no-code solar fan to a line follower robot – with the parts list and links to free step-by-step guides.

Build a working Arduino traffic light with three LEDs, 220 ohm resistors and a mini breadboard – complete wiring tables, full code and the mistakes we see real customers make.

A stable 5V into micro-USB or VIN — from a good adapter, or from a battery through a converter. Why WiFi bursts trigger brownout resets, why a bare 18650 must never touch the 3V3 pin, and the wiring that keeps an ESP32 running.

Get a first live video stream from the ESP32-S3 CAM over plain USB-C — no FTDI adapter, no IO0 jumper — and fix the upload, stuck-IP and brownout errors that stop most beginners.

An HC-05 costs about the price of lunch and puts your Arduino on your Android phone: PIN 1234, a 1k/2k divider, one sketch. iPhone user? Read the first section before you buy.

If your SIM800L reboots the moment it searches for a network, the supply is the culprit. It needs 3.4–4.4V and 2A bursts — here is how to power it properly with an 18650 or an LM2596 buck.

Three wires and the Adafruit NeoPixel library get a WS2812 stick glowing from an Arduino Uno in minutes. The part everyone skips is the power budget — 60mA per LED at full white, which is why the 8×8 matrix needs its own 5V supply.

A classic school robotics build: 2WD chassis, Arduino Uno, L298N and two IR sensors following a black tape line. Complete wiring table, full code, and the sensor-tuning ritual that makes or breaks the robot — ideal for RBT and FYP projects.