Step1: First use Altium Designer to design the schematic diagram and PCB of the circuit
Step2: Print the PCB diagram
The printed thermal transfer paper is not very good because the ink cartridge of the printer is not very good, but it does not matter, it can be made up for the subsequent transfer.
Step3: Cut out the printed thermal transfer paper
Step4: Transfer PCB circuit
CCL and cut thermal transfer paper
Cut the copper clad laminate according to the size of the PCB board
Of course, the copper clad laminate should be polished with fine sandpaper before the transfer (to polish off the oxide layer)
Tape on one end of the transfer paper
The legendary transfer artifact (PS: Thanks to the omnipotent Taobao, only you can’t think of it, but you can’t find it)
After 4 transfers, it’s ok, let it cool and tear it apart
How can it be effective?
Of course, if you don’t have a heat transfer machine, you can also use an iron (*^__^*) Hee hee…
Step5: Fill and transfer the PCB board
Since the print cartridge is not very good, you can use a marker to fill in the area that has not been transferred well
The filled transfer plate O(∩_∩)O~ Not bad!
Step6: Corrosion PCB board
Do not ask me! Go directly to Taobao
Corrosion artifact (heating rod + fish tank aerator + plastic box = PCB board corrosion machine)
Saw someone in the lab welding 8X8X8 light cubes while waiting for the corrosion to finish
What they designed themselves just sent out the board to do it
Corrosion complete
Step7: Punching and Tinning
Use fine sandpaper to sand off the toner on the surface of the PCB board in water
Use a cotton swab to apply a layer of rosin on the PCB (what? You ask me what rosin is? The rosin is to dissolve the rosin into 70% alcohol)
The advantage of applying rosin is that it is used as a flux when soldering. Another advantage is that it has an anti-oxidation effect.
tinned finish
Step8: Welding and debugging
After debugging, I found that to achieve the function I want, there is one output less than a pull-up resistor O(∩_∩)O~
finished product
(PS: The detection light of the function implemented by this circuit will light up the LED on the board when the light reaches a certain intensity)

Post time: Feb-21-2022