Priorities for rev C

Priorities

• Update to dual-A53 processor
• Protect serial ports, QEP and others that could drive inputs while power is off (at least 5V tolerance)
• Switch USB type-microB to USB type-C
• Add 5Gbps (SS) to USB type-C
• Add mux to support USB type-C host mode (cable flip support)
• Perform PD on USB type-C to enable charging when 20V is available, drop barrel jack
• Move MPU9250 to SPI
• Swap out motor connectors
• Move up to 3S LiPo battery and 12V motors
• Add support for quad 3-phase motors
• Add BeagleConnect-compatible subG wireless
• Add +/- 12V support on ADC
• Add Pi-compatible CSI connector for camera
• Add 5GHz WiFi
• Add PCIe as alt-mode to USB type-C
• Add RS-485
• Switch to push-pull microSD card cage
• Use gold plated pins
• Power motors when running on USB type-C
• TODO: Consider 28V 3-phase motors
• Switch some connectors to Click Shuttle ribbon header
• Support I3C
• Support FD-CAN
• Switch to Atheros9K for WiFi Consider going with WiLink8 discrete and 5GHz
• On-board audio codec

Wishlist

• PoE expansion
• MIDI expansion
• Multi-channel audio expansion

Features suitable to remove

• Bluetooth (not commonly used, whereas BLE and SubG can be more useful)
• 2.4GHz WiFi (too much interference)

Example motors to drive

Brushed DC

• DFRobot FIT0441
• Geartisan 12V DC

3 phase (BLDC, 3 phase stepper, etc.)

• Moon NEMA 17 3 phase stepper
• Primopal NEMA 17 3 phase stepper [ $6 on Alibaba ]
• XXD A2212 KV1000 BLDC
• OMC NEMA 23 3 phase stepper

Proposed motor drive circuit

• Driver: https://www.ti.com/product/DRV8316
• Reference design: https://www.ti.com/tool/TIDA-01516
• Gate driver, shunt amp: https://www.ti.com/product/DRV8323
• FET pairs (1/2 H-bridge): https://www.ti.com/product/CSD87353Q5D
• Temperature sensor: https://www.ti.com/product/LM95071

Issues to review

• https://github.com/beagleboard/beaglebone-blue/issues?q=is%3Aissue+is%3Aopen+label%3Afix-in-rev-b
• https://github.com/beagleboard/beaglebone-blue/issues?q=is%3Aissue+is%3Aopen+label%3Afix-in-rev-c

Integrate feedback from

• TAMU - https://mxet.github.io/SCUTTLE/ - https://docs.google.com/document/d/1LxO_4hpFQ1i4Vw9NmBai6ByAXrzt0i4g4wozqWoz0x4/edit?usp=sharing
• GT - https://fis.gatech.edu/multisensor-kit-mechanical-assembly/

GT

Blue GT feedback

• 24V DC input option in cabinets
• 24V/12V/5V DC output helpful for sensors
• 4-20mA loop (definitely!)
• ADC (big bottleneck) (brings to NI DAQ level)
  • -12V to 12V
  • Current measurement (currently rectifying)
  • 12/14-bit is good enough as is SAR max
  • 7/8 channels is good enough
  • Flexible software configuration ideal
  • How much tolerance? (not seen as much more than 12V)
• Enclosure is important
• Look at Automation Direct Productivity Open
• Look at ncd.io
  • Nice to have a block without doing extra jump
  • Wired version would be more determinisitc
    • OPC-UA, etc. when is time 0?
• 5GHz WiFi
  • Better stock WiFi antennas
    • Pi has better?
    • USB dongle did better
  • Better WiFi config
• Better PRU support
  • High-school/undergrad-level
  • Example code and interpreters
• Better support on image management
  • eMMC to microSD
  • Need to advertise it!
• Better community on-boarding
• Build on PRU and ADC advantages over Pi

IoT workshop in November

Review the GT cape

Linear position sensor cape just done

Thoughts on ribbon cables?