Agenda
- Better requirements
- Resources
- Team task allocation
- More wiki training?
- Cygwin/git, if necessary
- Carrier board projects
- Rocketbus connector: official specs, then try to find something better. Rocketbus debug/breakout cables.
- The SPS (also working on this: Marius).
- CF card interconnect, connector, and mounting.
- 2nd USB connector to 802.11a radio: connector
- Physical board factor now determined by avionics drawings and hole spacing on C channel.
- Other projects
- Battery sensor board, including I2C interface
- Cylindrical Patch Antennas
Resources
- PSAS
- USB
- CAN
- http://en.wikipedia.org/wiki/Controllerareanetwork
- http://techtrain.microchip.com/webseminars/ArchivedDetail.aspx?Active=50
Notes
- WPRs need to start this week.
- Need someone to make sure you're hitting capstone logistics (that won't be Andrew)
- SPS
- Requirements: Seee 2006 and 2009 capstone
- Tasks: Work with Marius, Andrew, and Tim to finish and SPS
- Rocketbus connector
- Requirements
- Mechanically and electrically robust, polarized, and locking
- Must be easily removable except when in a "flight mode"
- Must be as small as possible
- Must carry 8 electrical signals: Vb, ground, USB D+, USB D-, CAN H, CAN L, Aux 1, Aux 2
- Signals must be doubled up on connector for reliability: thus, requires >= 16 pins
- Must handle 20V @ 2A continuously on Vb/ground pins
- Must have horizontal and "up" and "down" right angle options for off-board connector.
- Tasks
- Review 2009 Capstone rocketbus design
- Spec parts if not already: see http://www.jst-mfg.com/product/pdf/eng/eJED.pdf
- CONNECTOR REVIEW: Is there something better out there that we can use?
- Do drawings, get some actual parts to play with
- Create PCB for cable connectors which goes to a strain relieved cable
- Choose cable(s)/wires for rocketbus
- Design breakout cables for debugging (Rocketbus to (USB, CAN, UART, power))
- Telemetry connector
- Requirements
- Need a secondary USB connector from FC to "802.11a USB dongle"
- Must have a polarized, locking connector.
- MAY want to power the 802.11a card from the FC's 5V supply so it always works when FC is on.
- May want some indication of data transfer and/or power?
- Tasks
- What protection circuitry and/or transceiver is required, both by rocket and by MPC5200?
- What's the smallest, best connector this? Maybe a smaller version of rocketbus?
- EAGLE schematic
- Tasks
- Read TQM5200 manual and understand the different pins (all 200 or so)
- Create a library part for the TQM5200 daughterboard
- Figure out connectors and get datasheets
- Create footprints for connectors AND physical dimensions, including screw holes
- Create TQM5200 schematic and make footprint and then device
- Have it carefully reviewed
- Order connectors
- Create first draft of the carrier board.
- Add rocketbus connector from
psas.lbr, and other parts as they come on line.
- Add mounting holes on 0.4" grid (see avionics module drawing)
- CF connector
- Requirements
- Must securely retain CF without data loss at (10,20,) g's of force at hundreds of Hz
- May have fastener to hold connector to PCB.
- Should be as small and lightweight.
- May give visual indication for power, reads, and writes.
- Must be polarized and locking connector
- Should be easily removable when not in flight mode; Must have a locked down flight mode (although this can be added to a COTS part).
- Must be able to handle largest storage capacities (which are?)
- Must be fastest available CF technology
- Must support Direct Memory Access transfer mode
- Tasks
- Read up on CF card interface. What is it? (ATA/IDE interface, I think?) How fast? What connections are necessary? Which are optional? Just a connector necessary, or pull up resistors?
- Determine what lines can come from the FC - is that enough? Do we need glue in between?
- What power supply does the CF require?
- Determine CF read and write speeds (for the software group)
- Choose a CF card
- Choose a CF card connector
- What fancy options can we have? LEDs to indicate use? Eject button?
- Power supply
- Requirements
- Must take an input voltage of (10,14,20) V
- Must provide 3.3V +/- (,1,5)% for the TQM5200 and CF card
- Must provide enough current, by at least a factor of 120%, to the FC carrier board.
- Must have a small footprint <= 9 cm&2
- Must be thin, <= 1 cm
- Must be light weight (todo: spec?)
- Must be able to survive (10,20,) g load
- Must be > 70% efficient under all operating loads
- Should have undervoltage cutoff, overcurrent cutoff or (foldback is OK).
- May have reverse polarity protection; if not, we'll provide it.
- Tasks
- How much current will the 3.3V TQM5200 with CF card take?
- How much current will the 5V USB 802.11a connector take?
- Through hole might be good for robustness, but isn't good for lead inductance.
- Check on SMT SPS "chips", like the Linear Technology's uModule.