HC-SR04-Ultrasonic-Sensor-with-Raspberry-Pi-Featured-Image

HC-SR04 Ultrasonic Sensor with Raspberry Pi

Using HC-SR04 Ultrasonic Sensor with Raspberry Pi is a relatively easy task. HC-SR04 is a very popular module that can provide the distance to the object by sending ultrasonic bursts at 40kHz and measuring the time it takes for the ...
Running LED with PIC16F877A Featured Image

Running LED with PIC16F877A

In this post I'll show a simple running LED circuit. Currently only 2 patterns are available but additional effects can be easily added by slightly modifying the code. This design uses only 16 LED's however PIC16F877 has 5 I/O ports ...
Digital Power Supply Prototype Board

Power Supply 2.5 – 12 V

Power Supply is probably the most common electronics project you can build.This is a basic design for digital power supply. It was built around 3 main components. Digital potentiometer – MCP4251-502E/P, Low  Dropout Voltage Regulator – MIC29152 and PIC16F877A.The idea ...
Basic-Arduino-Frequency-Counter-Featured-Image

Basic Arduino Frequency Counter

Basic frequency counter capable of measuring 0-5V square wave up to 100kHz can be built using just 2 components: Arduino MEGA board and 2x16 LCD display. For PIC16F876 version click here. Frequency counter code is also very simple. It uses ...
8x8-LED-Matrix-chaser-Arduino-Featured-Image

8×8 LED Matrix chaser Arduino

8x8 LED Matrix chaser based on Arduino MEGA compatible board will be presented in this post. It uses a LED dot matrix display module with two 74HC595 shift register chips connected in serial to control the LED output. Similar design ...
7-Segment LED Display I2C Featured Image

7-Segment LED Display with I2C

In this post we’ll add a serial data transfer capability to a standard 7-Segment LED Display by using PCF8574 I/O Port expander IC with I2C interface.For similar design based on Arduino see this link. Usually in order to minimize required ...
7-Segment-Display-Counter-with-Arduino

7-Segment Display Counter with Arduino

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 ...
Blinking LED with PIC16F684 Featured Image

Blinking LED with PIC16F684

This very simple design shows how to make a blinking LED using PIC16F684 MCU. In my previous post I’ve used PIC16F877/86 however most of basic circuits do not require a lot of I/O pins and PIC16F684 small 14 pin package is more ...
RFID-Security-Access-Using-Arduino-Featured-Image

RFID Security Access Using Arduino

In this post I’ll show you how to build a RFID reader for security access based on Arduino MEGA board. The code I've used is a modified version of a design that was published at Arduino project hub. I added ...
LCD-Countdown-Timer-Arduino-Featured-Image

LCD Countdown Timer Arduino

This post is about building a 3-digit countdown timer based on Arduino MEGA. Up/Down counter also available at this link. The timer will wait for 3-digit number to be entered via 4x3 keypad and then start counting down to zero ...