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January 9, 2006
So I’ve had this for a day, and made some observations:
The “Li-Poly Battery Connector” doesn’t exist. There’s a 2 pin header on the 5V bus, but nothing that will take a 1S or 2S battery.
Linksprite has a repo for kernel and u-boot that are crusty but sufficient
The hardware is similar enough to the SABRE platform that the directions at eewiki are close enough to get a modern kernel and distro working. At a minimum the write protect GPIOs need to be removed from the mmc section in the devicetree or Linux will insist that the SD card is write protected
My board has an FT232 populated but no connector. I know the production board isn’t supposed to have an onboard USB-to-TTL adapter, but it would have been nice to shave $4 off the BOM and pass that on in the final price if it’s not being used. Or is this a plot to sneakily get rid of FTDI clones?
The onboard 4 port hub has two unconnected ports. It would be nice if they were brought out to headers or connectors. Since it’s an SOIC it’s possible to blue-wire to them though.
The CODEC in the schematic is a Cirrus/Crystal part, but there’s a Wolfson part on the board. Also the DRAM parts are slightly different Micron parts (higher speed grade) than the ones in the schematic. It would be nice if the schematic were accurate.
News - Your August Caption Conte…
about 2 weeks ago
Thanks! I have plans for this… Big plans….
News - It's an August Caption Co…
about 3 weeks ago
REMOVE CASEY BEFORE FLIGHT
News - SXSW Recap Video
about 6 months ago
I went Friday by myself and had fun building one up and playing find-the-blinky-space-pod, so I brought my kids on Sunday so my 7 year old son could try his hand at soldering. The line was too long for his younger sister’s patience, so we bought a Simon PTH kit and he built it up at home instead (also a lot of fun, and with 100% more Bee-Gees). That’s not to say the booth was too small, it was by far the busiest one there.
Mine is still hanging by my desk, waiting to be repurposed.
I’m curious: why the FTDI UART? I’m not asking out of lingering FTDI-gate rage, but because it seems a 32U4 would be a cheaper alternative for a cost-sensitive gimme like this.
Also, the matrix is really nifty on its own, and the right angle header makes it easily breadboarded.
Thanks for the freebies!
about 6 months ago
Got everything working except the 2 Edison blocks with misplaced mezzanine connectors, which are near impossible to hand rework.
about 8 months ago
I managed to get this to work on the mini breakout, but I had to desolder the headers for the battery and thermistor, and desolder the power button. The application I’m using it in needs the battery, so I soldered a JST on the other side of the board and shorted the thermistor pads (for 190mA charge rate). The ground pads on both of these aren’t thermals, so I had to bring it to work to hit it with a meatier iron than my station at home to get these out cleanly. I also wound up having to buy 4mm M2 screws since the ones included in the SF hardware kit are too short to fit through the breakout.
I also took the opportunity to solder this DC barrel jack to the pads at the other end of the board, which works fine for the pile of 2A 12V adapters I have in my junk box.
about 10 months ago
I’m using one for a direct-drive 1.75mm extruder. It works great with a little cooling at 1.4A@19.5V off of a Smoothieboard. Retracts are consistent with no skipping or stalling at 4mm @ 50mm/s. Because of the smaller step angle than typical 3D printer steppers, it’s not a good choice for geared extruders. This would also be a great motor for axis drive on a delta or XY gantry printer.
about 11 months ago
The JPEG trigger board with the microSD slot seems to work, or at least blinks the LED different colors when I apply power. The gnarlier one’s FTDI works, but I haven’t powered the micro yet. It looks like the DTR reset cap is missing along with a couple other discretes so not sure how much I care to debug it. I don’t have the matching camera so it’s just a spare Arduino for… things.
News - Can Soldering Help Therap…
about 11 months ago
When I used to work as an apps engineer, I’d hide in the lab and repair eval kits from the bone pile. Desoldering and replacing a bad 208 TQFP is surprisingly relaxing once you’ve moved beyond being intimidated by SMT. It was a good way to unwind after dealing with difficult customers and office drama.
Got it yesterday, was not disappointed.
No public wish lists :(
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