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
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