Pcb improvement #2
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…tor parts updated capacitor parts with part numbers
added part numbers for capacitors, resistors, ic's and the main 12v connector. cleaned up the board layout a little, mainly just straightening traces. fixed the through hole 100uf cap footprint to reflect the bom part, 2mm leads 5mm body made both leds the same part number. removed the polarized caps from the sd card and replaced with smd 0805 ceramic caps. cleaned up the schematic a little and added a frame
little more silk screen shuffling and clearing DRC errors
added bypass caps to the atmega328 and the 3v3 ldo per the datasheet. on the board relocated the 5v ldo bypass caps to be near the device itself.
changed motor connectors to .1" pitch 4 pos headers. the stepper motor stock connectors press nicely onto these. so if one wanted to they could just pins instead of soldering wires directly to the board. if soldering directly to the board the new larger pads should be more robust too.
moved the led next to the screw terminals. I have found people seem to like being able to see if a specific connection is getting power or not rather than having to look around on the board for an indicator and figuring out what it means.
finishing up this round of board improvements by cleaning up some traces
updated board name while retaining the original board design files
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these are functional changes to the board and include:
new 16mhz crystal that doesn't require external caps and is much smaller.
bypass capacitor work:
brought the total number to 3 for the atmega328, one per vcc pin
moved the 5v bypass caps next to the ldo on the board for direct routing
added bypass caps for the 3v3 ldo
moved the sd card bypass caps as close as possible to the sd card
the sd card slot is now closer to the side of the board
replaced the old motor connectors with .1" pitch headers, this allows for direct wire to board as well as using headers to connect to a motor.
moved 12v led next to power connection.
more trace simplification
I have this version of the board on order to verify functionality, wouldn't recommend merging until that board is in and tested. in the mean time i would like feedback on some of the arbitrary choices like changing the motor connectors and moving the 12v led indicator.