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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

I2C Serial LCD Interface Module Arduino


In this post I’m going to show you how to use a Serial I2C Interface Module to control 2×16 LCD display with Arduino. For similar design using PIC16F876 click this link. Instead of using 8 or 4 bit parallel connection

4-Digit LED Dot Matrix Clock Arduino


Here is another digital clock design based on Arduino. This time it uses 4-Digit LED Dot Matrix module to show the time. Similar design with LCD display is available here. The Dot Matrix module consists of four MAX7219 chips connected

8×8 LED Dot Matrix Display with Arduino


In this article I’m going to show you how an 8×8 LED Dot Matrix Display can be driven by MAX7219 with Arduino. Similar design based on PIC16F876 MCU is available at this link. For this project I’ve created my own

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 2×16 LCD display. For PIC16F876 version click here. Frequency counter code is also very simple. It uses

Stepper Motor Controller with Arduino


Basic Stepper Motor Controller can be built with Arduino board and few additional components like MOSFET switches and a potentiometer to control unipolar stepper motor speed and direction. The principle of operation is relatively simple. When a potentiometer is in

Arduino 4-Digit 7-Segment LED Voltmeter MAX7219


Here is another version of Arduino based voltmeter. This time it uses 4-digit 7-Segment LED display and MAX7219 Display Driver. For similar design with 2×16 LCD display click this link. Also you can look at PIC16F876 implementation in my previous

Arduino 7-Segment LED Display MAX7219


MAX7219 is a serial input/output common-cathode display driver. It can interface the microcontroller to 7-segment numeric LED displays, bar-graph displays, dot matrix display or  individual LEDs. This IC has some very useful features like built in decoder, multiplex scan circuitry,

LCD Countdown Timer Arduino


This post is about building a 3-digit countdown timer based on Arduino MEGA. For related circuit based on PIC16F876 MCU click here. The timer will wait for 3-digit number to be entered via 4×3 keypad and then start counting down

Arduino PWM Fan Controller


This implementation of Arduino based PWM Fan Controller is simple circuit that allows controlling fan speed by varying the duty cycle of the output signal. For PIC16F684 version click here. I’ve tested with Deepcool 120mm fan and it works OK,