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=== "Police Car Badge" === | === "Police Car Badge" === | ||
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File:PCB_Frontside2.png | File:PCB_Frontside2.png | ||
</gallery> | </gallery> | ||
Before I explain the backside of my board, I wanted to comment on the components I used for my PCB. Almost all of the parts are SMD components, that have to be mounted only on one side on the board, facing outward. In the case of my project, it is the frontside. The battery holders on the other hand need through holes drilled into the board and copper pads on the backside of the board, so they can be soldered to it. The LEDs I used also need through holes because they are a special type of LEDs, called reverse mount LEDs. They are mounted on the board facing inward. The middle part of the LED is placed into the hole, while the pads of the LEDs still sit on the frontside of the board. With this way they shine through the PCB. I designed it like that because I wanted the side of the PCB board with the actual design to look neat and flat but I also wanted the parts of the layout resembling the siren and headlight to light up/blink. | Before I explain the backside of my board, I wanted to comment on the components I used for my PCB. Almost all of the parts are SMD components, that have to be mounted only on one side on the board, facing outward. In the case of my project, it is the frontside. The battery holders on the other hand need through holes drilled into the board and copper pads on the backside of the board, so they can be soldered to it. The LEDs I used also need through holes because they are a special type of LEDs, called reverse mount LEDs. They are mounted on the board facing inward. The middle part of the LED is placed into the hole, while the pads of the LEDs still sit on the frontside of the board. With this way they shine through the PCB. I designed it like that because I wanted the side of the PCB board with the actual design to look neat and flat but I also wanted the parts of the layout resembling the siren and headlight to light up/blink. | ||
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File:PCB_Backside 4.png | File:PCB_Backside 4.png | ||
File:PCB_Backside 5.png | File:PCB_Backside 5.png | ||
File:KiCad, 3D-Viewer Backside LED 1.png | |||
File:KiCad, 3D-Viewer Backside LED 2.png | |||
File:KiCad, 3D-Viewer Backside LED 3.png | |||
File:KiCad, 3D-Viewer Backside LED 4.png | |||
</gallery> | </gallery> | ||
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File:KiCad, 3D-Viewer Backside.png | File:KiCad, 3D-Viewer Backside.png | ||
</gallery> | </gallery> | ||
'''Finished project:''' | '''Finished project:''' | ||
The PCB board is about 83mm times 153mm and it is 1,6mm thick. | The PCB board is about 83mm times 153mm and it is 1,6mm thick. | ||
Before actually finishing the board, I had to get new capacitors because the ones I bought before did not have the right capacity. | Before actually finishing the board, I had to get new capacitors because the ones I bought before did not have the right capacity. | ||
I had to improvise a bit and the end result looks clunky, since the capacitors a quite big. They lie above the resistors R1 and R4 but because of the plastic at the bottom of the parts they do not interfere with the resistors. It functions how I wanted it to and I am happy with that. | I had to improvise a bit and the end result looks clunky, since the capacitors a quite big. They lie above and overlap with the resistors "R1" and "R4" but because of the plastic at the bottom of the parts they do not interfere with the resistors. | ||
I had some spare resistors left and I experimented with them. I soldered two on top of the resistors "R2" and "R3", that were already mounted on the board, so that they are connected in parallel to each other. By doing this I increased the blinking speed of the LEDs. | |||
It functions how I wanted it to and I am happy with that. | |||
When I was finished with the soldering process, I clipped of the pin from the battery holder that was sticking out from the backside of the PCB. But only the top one. The one pin below that I bend to make it look like a door handle. | When I was finished with the soldering process, I clipped of the pin from the battery holder that was sticking out from the backside of the PCB. But only the top one. The one pin below that I bend to make it look like a door handle. | ||
As a last step I cut out green, orange, red and blue crafting foil in the shape of the sirenlights, the headlights, the car doors and the hood of the car. I stuck the foil onto the board and with this my badge is finally complete. Now it has all the colors I wanted it to have but I could not create, due to the limited option of layers and colors. | As a last step I cut out green, orange, red and blue crafting foil in the shape of the sirenlights, the headlights, the car doors and the hood of the car. I stuck the foil onto the board and with this my badge is finally complete. Now it has all the colors I wanted it to have but I could not create, due to the limited option of layers and colors. | ||
Here | GitHub Repository: | ||
https://github.com/Rik3Kat/PoliceCar_PCBArts | |||
With my GitHub repository you have access to the KiCad files for my project, I developed over the span of this course and download them. | |||
<gallery> | |||
File:PCB finished (3).jpg | |||
File:PCB finished (4).jpg | |||
File:PCB finished (2).jpg | |||
File:PCB finished (6).jpg | |||
File:PCB finished (5).jpg | |||
File:PCB finished (7).jpg | |||
File:PCB finished (8).jpg | |||
File:PCB finished (9).jpg | |||
File:PCB finished (15).jpg | |||
File:PCB finished (16).jpg | |||
File:PCB finished (11).jpg | |||
File:PCB finished (10).jpg | |||
File:PCB finished (12).jpg | |||
File:PCB finished (13).jpg | |||
File:PCB finished (14).jpg | |||
File:PCB finished (17).jpg | |||
File:PCB finished (1).jpg | |||
</gallery> | |||
Here are two videos demonstrating the functionality of my PCB: | |||
{{#ev:youtube|L2tGN1L0s-I}} | |||
{{#ev:youtube|GiVNKXc-w_Y}} | |||