Greetings !
I present another project in which I used a 4-digit 7-segment display, but this time it is a common cathode with 12 pins, red color.
It is a settable clock, but the idea is more about the pleasure of making a PCB, so you can share your opinion.
Using the same technique, with a multimeter and an internet search, I discovered the functionalities of the pins of this display, which one is a digit and which is a segment. It is a homemade PCB, designed in KiCAD, made in two layers, for which I used only THD components. Luckily with my friend, he has an ultraviolet device and copper vias that I plant with a manual press, so I was able to make this circuit in two layers, it was a bit difficult in one layer because it came out a bit tangled and had larger dimensions. As can be seen in the diagram below, the display is connected to uC via a 4.7kohm resistive network, without the help of any transistor, the control is performed only by the microcontroller. The numbers are formed by turning off the segments, so not turning them on. By using two push-buttons we can adjust the clock.
/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-03-68/Demo.mp4
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