Measure Distance using Ultrasonic Sensor HC – SR04 | Pi4J | JAVA | Raspberry Pi

uLTRASONI pI

This is a simple tutorial showing how to interface HC – SR04 ¬†ultrasonic ranging module with Raspberry Pi to measure distance using JAVA. Ultrasonic ranging module HC – SR04 provides 2cm – 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules include ultrasonic transmitters, receiver and control circuit. The basic principle of work: (1) Using IO trigger for at least 10us high-level signal, (2) The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back. (3) IF the signal back, through…

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Custom Character Generator for MAX7219 based 8×8 LED Matrix

MAX7219 LED Matrix Custom Char

In this video, I will show you a custom character generator for MAX7219 based 8×8 LED matrix. The app is developed using JAVA. If you are interested in making some updates to it you can check out my repository on GitHub. All links are provided below.        

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