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Here is another Arduino based design and this time I’ll show you how a 4-Digit Code Electronic Lock can be built with Arduino Mega or compatible boards. For similar design based on PIC16F877 click this link. The I/O I’ve used for this project are common for both Arduino Mega and Arduino UNO boards so this … Read more
Digital Alarm Clock based on Arduino MEGA board and 2×16 LCD display is the topic of this post. Similar design based on Raspberry Pi can be found at this link. For PIC16F877 version click here. This design should also work on Arduino UNO or any other compatible boards. However I did not test it. Arduino … Read more
This post is about building a distance meter using HC-SR04 Ultrasonic Sensor and Arduino MEGA board. For PIC16F877 version click here. Raspberry Pi variant is also available at this link. HC-SR04 module can measure distances ranging from 2cm – 400 cm. The interface is relatively simple. According to sensor datasheet a short 10us pulse should … Read more
Recently I’ve published a basic Binary to Hexadecimal converter design based on Atmega 2560 chip. The same set up can be used for building a simple UP/Down counter with Arduino Mega compatible board. 7-Segment display and its I/O stayed the same but now only 1 input (Pin 9) is used to select the counter direction.”0”- UP,”1” … Read more
A simple bargraph voltmeter can be built using 2×16 LCD or compatible VFD display. For Arduino version click here. This design utilizes PIC16F877 microcontroller and its ADC block to convert 0 – 5V input voltage to a binary number shown as active segments on the display. In this particular design I’ve connected CU16025-UW6J VFD 2×16 … Read more