I've designed an PCB and due tot the delivery times, I kinda want to order it right now. I don't yet have the components, so I haven't actually tried it on a breadboard.
Now I'm unsure if the PCB would work, as this also is my first try in PCB design.
It's a single-sided PCB. All parts (should be) through hole. I would be using SoftwareSerial since the ATTiny does not have serial (Rx/Tx).
[TL:DR] Would this PCB work?
Some points of which I'm unsure, or might be a problem:
- Is the spacing of the board/lines to other components/side big enough?
- Should I use a copper/ground fill? Which and why?
- Are the rounded-off traces actually better as sharp edges?
- It says: 36mm by 15mm isn't this too small to fit all those components?
- Can I actually use the RESET pin as other functions (without changing fuse bits)?
- Doesn't it need any resistors? I've seen some on the RS485 breakout boards.
If someone needs the file: It's opensource, no restrictions. Would be nice to give me some credits/donation, but you can freely use it for even commercial projects. Download below:
Some credits to Nick Gammon, I've used his schematics as a reference (especially on the TX enable pin, which was quite smart, using only 1 pin).
Changes: - replaced the "V" shape. - pull-up on the reset pin. - decoupling capacitors
EDIT: It's better not to use a pull-up resistor on the reset line. The ATtiny85 has this internally.