Rev-C updates:

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

• [STRIKEOUT:Reference design: https://www.ti.com/tool/TIDA-01516]

• [STRIKEOUT:Gate driver, shunt amp: https://www.ti.com/product/DRV8323]

• [STRIKEOUT: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?