Arduino Compatible 2-digit 7-segment Display Board for Timer/Counter
- Rajkumar Sharma
The project presented here is an open source 2-digit 7 segment Arduino compatible display board. It can used in many applications that require 2-digit display and switches inputs. Possible application of this board is a 2-digit counter, 2-digit countdown timer, token display, score board etc. 2 x 7 segment 0.56-inch Common cathode displays are used in multiplexing mode. Refer to the connection table to check connections between display segments and Atmega328 chip. A led connected to A4 pin of IC is used as indicator LED. All 3 switches have pull-up resistors of 10Kohms, 220E ohms series resistors used between I/O pin of Atmega328 chip and display segments.
Boot-Loader/Arduino Code Uploading
A bare new Atmega328 chip requires bootloader-burning and code uploading, follow the link bellow to learn both operations.
- Operating Power Supply VCC 5V DC @ 50mA (CN1)
- 3 Tactile Switches with pull up resistors
- A LED on A4 pin for function
Example code provided below so you can test the board. it is 99 second count down timer with adjustable time 00 to 99 Seconds.
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