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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 2×16 LCD display to show card ID and MOSFET driver for controlling an electric strike … Read more
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 from Arduino board to LCD only 2 pins are required. One for sending the Data … Read more
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 post. Interfacing the MAX7219 was covered in this article. You can see in the Arduino … Read more
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, segment and digit drivers, and on-chip memory to stores each digit value. Only one external … Read more
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, however you’ll need to adjust the lowest PWM value according to a specific fan you … Read more