GM Interface Board

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Design from the community from: @vntarasov

THIS IS ALPHA QUALITY HARDWARE, NOT TESTED, NOR DESIGNED BY COMMA.AI, FOR RESEARCH PURPOSES ONLY. THIS IS NOT A PRODUCT. YOU ARE RESPONSIBLE FOR COMPLYING WITH LOCAL LAWS AND REGULATIONS. NO WARRANTY EXPRESSED OR IMPLIED.

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Parts for case assembly (mcmaster part numbers):

• 92010A122, M3 12mm flat head
• 94180A331, M3 heat insert

PCB parts: digikey.csv

Connector pins:

• For data pins, Digikey part # SAM12735-ND
• For power & ground pins, Mouser part # 829-15304702

Assembly steps:

• Order PCB from Oshpark and populate yourself, or order a populated PCB from Macrofab Solder everything except for connector headers and power pins
• Flash the board with
  • Connect 5v, ground, data+, data- to USB host. Use external 5v power
  • Don't use 5v linear regulator for USB power, it will get fried
  • Pull high (to +3.3v net) BOOT testpoint, through 1k resistor, to put board into DFU
• Print case.stl and connector.stl, use ABS filament
• Install m3 heat insert into the case
• Drill holes in the connector housing for easier insertion of data pins, from 0.7mm to 0.75mm
• Cut 0.1" connector header SAM12735-ND to 12-pin and 16-pin sizes
• Cut one of the 829-15304702 short, bend the other one 90 degrees
• Insert shorter 829-15304702 (+12v) into connector housing
  • Put enough solder on the +12v testpoint of the PCB
  • Insert 0.1" headers into PCB, then solder the +12v pin to the PCB
  • Connector's plastic is going to melt, immobilizing the +12v pin is recommended
• Solder 0.1" headers to the PCB
• Insert 90-degrees bent 829-15304702 (ground) into connector housing, solder to PCB
• Bolt down connector housing to the case