8-segment LED port test indicator light sequential light

Project Background:
I was just starting out learning PCB design with JLCPCB, and I often tested my ideas on breadboards.
When testing a 74HC595D series circuit, I wanted to use 3 GPIOs to control the lighting status of 16 LEDs
. For this, I specifically soldered some small boards to the breadboard for testing
and improvement.
First, I bought some surface mount to through-hole (SMT) boards online
 
and soldered resistors and LEDs onto them, like this.
 
Next, I connected the resistors and LEDs, using jumper caps.
 
To achieve common cathode or common anode, I needed a wire to connect a whole row of pins.
I used a header pin, soldered all the pins, and led out a wire.
 
The finished product was
 
an 8-LED common anode LED sequential light.
 
Project Testing Real-World
 
Improvement:
To change this ugly interface, save space, and make it cleaner, I decided to design a small board to change the situation.
I wanted this small board to be able to be directly plugged into the breadboard, so I used a 1x9P board. The pin headers (2.54mm pitch)
may require either common cathode or common anode configurations in actual testing. Additionally, because small breadboards have limited holes, I wanted to be able to fit two such small boards
so the power supply could be connected externally via wires. The eight LEDs would be directly plugged into the breadboard.
Therefore, I decided to use four different designs: common cathode, common anode, common terminal at the top, and common terminal at the bottom.
Common anode LEDs light up at low levels, and common cathode LEDs light up at high levels.
They look like this: [Image of common anode_top common terminal], [Image of
common anode_bottom common terminal], [Image of common cathode_bottom common
 
 
terminal], [Image of common cathode_top common terminal] . The soldering test board arrived. I prepared the components and started soldering. All the boards are now ready. Here's a comparison photo with the previous ones. Other notes: Board soldering is relatively simple. You can get it for free from JLCPCB. The LED color and resistance can be changed to your liking or what's suitable. For those who don't want to do it themselves, you can search for "8-segment LED port test light" on Taobao. Finally, I wish everyone a smooth board-making process.