Build an electronic radar project with Arduino using the HC-SR04 ultrasonic sensor and a servo motor, visualizing the results on your computer with Processing.
A complete guide to displaying text and messages on a 16x2 LCD screen with Arduino, covering 4-bit wiring, the LiquidCrystal library, and common contrast issues.
A practical guide to building an automatic temperature-controlled cooling fan with Arduino, showing the reading numerically on two multiplexed seven-segment displays.
Choose a safe transistor substitute by checking device type, voltage, current, power, gain, pinout and package, with examples and datasheet guidance.