Arduino Seven-Segment Digital Clock
This project is about to use four CD4543 "BCD-to-Seven-Segment" drivers to drive four 7-Segment elements; the drivers
are driven by an Arduino Micro (any microcontroller board with enough I/O pins can be used for this).
The Arduino source code, images of my prototype, a socket (to hold the assembled board; STL for 3D printing) and the circuit (as PDF) can be downloaded here.
Parts list:
| Count | Item | Value | Description |
|---|---|---|---|
| 4 | R1 - R4 | 180Ω | Resistor for 7S's |
| 1 | R5 | 68Ω | Resistor for LED's. |
| 2 | S1 - S2 | Push buttons | To adjust hours and minutes |
| 4 | DIS1 - DIS4 | CD4543B | Driver |
| 1 | C1 | 220μF; > 5V | Capacitor for stable power source |
| 4 | C2 - C5 | 440μF; > 5V | Optional "Fear capacitor" |
| 1 | Stripboard | Optional | |
| 1 | Arduino Micro | Microcontroller | |
| 2 | LED1 - LED2 | LED | LED's between hh and mm |
Note that in the schematic the power circuits of IC1 - IC4 are next to the IC's, altough they are integrated in the IC's itself:
The brightness of the 7S's can be adjusted with the resistors R1 to R4, the brightness of the center LED's can be adjusted with R5 (increase value = brightness down).
To get a stable voltage, i placed the capacitors C1 to C5 between GND and the specific VSS pins, maybe they can be left out, but i recommend them.
Since i wanted to use my clock (which is difficult, if the board is in a horizontal position), i printed a "board holder":
Feel free to create your own clock based on this, and don't hesitate to contact me if you running into any problems!