Author Archives: MakerHub Helper

Two potentiometers and a button. How to read an analog joystick properly on an Arduino Uno, then drive two MG90S servos as a pan-tilt that stays where you point it.

Three wires, TinyGPS++ and a clear view of the sky. Why a NEO-6M that never blinks indoors is working perfectly, and how to tell a wiring fault from a sky fault in two minutes.

An LDR plus one fixed resistor makes a voltage divider on A0, and two thresholds in code keep a dusk light from flickering. Wiring, calibration and a 12V relay upgrade.

A waterproof DS18B20 reads water temperature over one Arduino pin — red to 5 V, black to GND, yellow to D2, and one mandatory 4.7 kΩ pull-up. Full OLED sketch, several probes on one pin, and what −127 and 85.00 are telling you.

How to wire and set a multi-function 12V delay timer relay module – choosing on-delay, off-delay or cycle mode, setting the time band, and a worked zero-code auto-off light.

The HX1838 receiver needs one Arduino pin and one library — and the IRremote v2-to-v4 change is why so much copied IR code stops working. Decode your own buttons, then drive two LEDs and a relay.

A Bluetooth RC car is a 2WD chassis, an L298N driver and an HC-05 that hands your phone’s button presses to an Arduino. Every app button sends one ASCII character, and the sketch is a switch-case that turns each character into an H-bridge state.

A complete 2WD obstacle-avoiding robot car with an Arduino Uno, L298N and HC-SR04 — from peeling the chassis film and soldering the motor tabs to the battery maths that decides whether it rolls or crawls, plus the full runnable sketch with per-motor speed trim.

An MQ-2 module tells you the air has changed, not how many ppm. Warm it up, let the Arduino learn what clean air reads, and alarm on the rise — with wiring, working code, honest calibration limits and a relay-driven exhaust fan upgrade.

An HC-SR04 measures hand distance, the Uno checks one threshold, and an SG90 servo lifts the lid — with the power split that keeps it steady.