Arduino sensor tutorials covering HC-SR04 ultrasonic distance sensors, KY-022 IR receivers, TCS34725 RGB color sensors, and KY-033 infrared line sensors. Each guide includes wiring diagrams, working principles, and tested example code.
This tutorial walks through the HC-05 and HC-06 Bluetooth modules with Arduino. You’ll wire up the module, control an LED over Bluetooth, build a basic app in MIT App Inventor, and then take it further with relay-based lamp control. I also cover the common issues people run into and a few frequently asked questions.
The HC-SR04 is probably the first distance sensor most people try with Arduino, and for good reason — it is cheap, simple to wire, and works well for basic projects. I explain how it measures distance using ultrasonic pulses, walk through the wiring, and include tested code you can upload right away. There are also a few project ideas and fixes for common problems.