alexwhittemore/burt-mk-ii-daq

Boston University Rocket Team's MK-II Hybrid Motor Data Acquisition System

burt-mk-ii-daq's Issues

No silk to denote pin 1 of U1

Thermocouple digitizer r1.0 has no silkscreen to denote pin1 of U1, the MAX31855.

LTC1063CSW footprint too thin

Make wider to match part.

Change part name to LTC1063CSW

from LTC1063SW

rx/tx pairs need to be swapped

The usb cable crosses over RX to TX, which is not presently accounted for on the B connector side.

Add Jumper for 5V and USB 5V paths

self explanatory. Want to be able to power satellite chips from USB.

Main board silk incorrect

Says 'thermocouple digitizer'.

Motor3/4 headers swapped in schematic and layout

The Motor3 and Motor4 output headers are swapped in schematic on the output of the H-Bridge, and therefore are swapped in layout as well. The practical result is that MBED pins 25/24/23/22 correspond to M1/M2/M4/M3 by accident.

Relocate mounting holes for more clearance

Main board mounting holes leave little screw head clearance.

Clean up silkscreen around hbridge

The hbridge silk runs over the regulator next to it.

Thermocouple QR Code unreadable

Resize or remove

Add USB->+5V short jumper

It'd be useful to be able to power the 5V sections of the board directly from USB through the mbed, but it isn't safe for this to be a permanent thing (normally the board will be on battery, so a regulator is necessary, but for the times the board's 5V rail is supplied by USB, the regulator can't be connected). A jumper to select which 5V source is used is desirable.

Re-route MOSI to CNV and CS to SDI

The AD7685 uses a shared CNV to initiate conversion on all chips, then a per-chip connection on SDI to handle whether the chip writes to the miso line or not. Therefore, on the bridge digitzer board, these two lines should be swapped.

Label USB jacks (bridge)

It'd be helpful for debugging for the USB B jack to have silk labels describing which signals are where.

LTC1063CSW footprint too thin

Make wider to match part.

Add USB pinout silk

It'd be useful for debugging to add silk labels for all the USB A pins on the main board (one socket per side) describing which signals they carry.

quad-half H bridge is not bypassed.

Add power supply bypass capacitors.

Rearrange CS Pins for spiA and B

Make sure for board rev2 that all the CS pins for spi bus A are on the same GPIO port, and that all the CS pins for spi bus B are on the same GPIO port. This will help for very fast, timing critical chip selecting.

Tx/tx pairs need to be swapped

The usb cable crosses over RX to TX, which is not presently accounted for on the B connector side.

Add silk for LCD Header

The LCD header should have instructive silk screen on it including the right insertion orientation.

Add silk to USB jacks

I'd be useful for debugging to have the USB B jacks labeled in silk with which signals they carry.

Re-route USB data lines

Eagle V6 now supports differential routing. The USB data pair for the thumb drive Jack should be redone for consistency.

Add SD card slot to main board

Use the SPIB port

Bridge QR Code unreadable

Resize or remove

Make silkscreen note about series input resistor

The bridge digitizer can be used without additional protection provided the clocked filter board is in place - this filter chip, with vdd=5v, can withstand an input range extending past +3.3v, while its output won't source enough current to break the AD7685 at these higher voltages. However, without this filter board in place, a direct short of filt_in to filt_out on the sensor board will result in a free, high-current path from the powerful amplifier output to the ad7685. A pressure spike or other high input voltage source could then break the 7685.

Wheatstone Bridge digitizer silk incorrect

Says 'theromocouple digitizer'

Main QR Code unreadable

Resize or remove

Add silk for AD7685 bypass caps

The bridge digitizer board is missing silkscreen for bypass cap values next to the AD7685/IC3

H Bridge toggles outputs on poweron

Look into that.

Rename 'Filter Board' to 'Clocked Filter'

Eventually, there may be multiple filter boards (since the point is to have a plug-and-play interface to support multiple filter designs). Therefore, the title 'filter board' is ambiguous and unhelpful.

TC Digitizer input pins are swapped.

TC connector and chip nets swapped, connector + goes to chip - and vice-versa.