Paul GouldJLC now do cheap PCB manufacture and SMT Assembly.
I have changed the components to suit what is available at JLC https://jlcpcb.com/client/index.html#/parts
ATSAMD21G18A-AU (CPU)
DRV8305NPHPR (MOSFET Driver)
with 3 Phase Current Sensor
NVTFS5C453NL (N-MOSFETs 3x3mm 3mOhms 40V)
MA730GQ-Z (Absolute Magnetic Encoder 14-bit SPI) or AS5xxx
MP2359DJ-LF-Z (3V3 1A DC-DC Converter)
SP3485EN-L/TR (RS485 comms)
24LC01BT-I/OT (EEPROM for ID and parameter storage)
STLM20W87F (Temperature Sensor for MOSFETs)
Voltage monitor
External Motor Temperature Connector
Qwiic connector (I2C) for OLED display
SPI Remote Encoder connector
UART Connector
Servo connector
USB programming connector
SWD programming connector (for putting in the Arduino Bootloader
Reset Button (for getting it into the bootloader)
Discussions
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Hi guys, do you have updated schematics/parts lists, I read @Paul Gould message about the lessons learned, I'd like to learn form the too! I will soon contribute!
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Sorry, I haven't updated the schematic after I found the faults. I moved onto the ESP-32 board.
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Info in your messages.
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Hi @Paul Gould I'm starting to lay out a PCB schematic based on a pared down version of this. Planning to use the TLV493D on I2C as the encoder. Regarding the pin out off the SAMD21, predominantly thinking of the connections to the DRV8305, is there anything you'd change? I'm comfortable changing SPI to other SERCOMs and pads so if the routing was less than ideal with this configuration. I also plan to go crystalless - hopefully that will not cause timing issues down the road but I've had success in other crystalless SAMD21 applications so worth trying here.
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