I've just sent this new variant off to the fab.
It's a 1284p board, and like the other embeddedcoolness.com "RFX" dev board designs I sell, it has built-in nRF24L01+ headers, and prototyping area.
This is physically a much bigger dev board compared to it's siblings, however. It's "Mega" dimensions - about 5x10cm. No choice really -- that 40-pin DIL package is one big-ass chip! (BTW, the reason the rendering shows the board only partly populated is that just happens to be the components that there were available models for. But it gives you the idea.)
It's routed to use the "Bobuino" pin mapping (I was looking at both the "Goldilocks" and the "Bobuino" mappings, which are quite similar, but the "Bobuino" seems to be the more popular.)
So it's nicknamed "Big Bob". :-) [edit: since renamed "Skinny Bob", hence change in thread title.]
Since I had all that real estate to work with, I added a few things not on the other RFX boards.
It's got two big old TO-220 LD1117 voltage regulators on it -- one for the 5V rail and the other for the 3v3 rail.
Lots of real estate taken up just there, but nice beefy rails, without SMT! (All through-hole construction on this board.)
Standard Arduino shield header layout, including the ICSP SPI connector.
You can also mount it on breadboard, or connect it to standard 0.1" pitch proto board. The standard layout Arduino shield headers are also shadowed by a second set of breadboard compatible headers. The extra ten 1284p IO pins are also broken out into an additional breadboard compatible header.
So "BoB" could stand for "best of Both" in this context. :-)
(IIRC, there actually was a video card for PCs out years ago called the BoB board, and I'm pretty sure that was the explanation for its name. Can't remember much else about it, though.)
For convenience, there's also a header for USB-to-TTL cable connection, to allow for bootloader programming or a USB serial port interface. Uses the standard Sparkfun FTDI breakout board "GRN (DTR) to BLK (Gnd)" pin header layout. (Optionally, ISP programming via the ICSP header, of course.)
Power configuration is flexible via 3-way jumper on a 6 pin block to supply Vcc to the 1284p from the 5V rail, the 3v3 rail, or directly from Vin. Or leave the jumper off for a power configuration this doesn't cover.
The 5V rail or 3v3 rail can also be also be tied to Vin by a jumper, if desired. (Obviously, you probably only want to do this if Vin is a well-regulated 5V or 3v3 supply!) This configuration could be useful in saving the need for the 5V regulator if you were already running a 5V supply to Vin, for example.
If you are supplying just 3v3 on Vin, then both regulators could be dispensed with, if you were happy to run the 1284p on 3v3 (for 16MHz clocking, the minimum Vcc should be at least 3.78V according to the datasheet. so this is strictly out of spec. There has been one report which indicates the 1284p may not be as tolerant as, say, the 328p for "overclocking" in this way. You could always run it at 8MHz to get back within spec, however.)
So provision for lots of power configurability and capacity.
What else? There's provision for the 10mH inductor recommended in the Atmel datasheets to smooth the AVCC supply for higher resolution analog reads. And of course you can't have a dev board without provision for a LED attached to D13 in case you want to run "blink", LOL!
The balance of the board real estate is given over to a prototyping area.
That's pretty much it. So there it is. yet another 1284p board! These should be arriving from the fab at the same time as the Pro Mini 328 and Teensy 3.x nRF24L01+/proto boards described in the earlier thread, so I will update this thread when I've had a chance to assemble and test all of them.