Teensy with a STM32F405?

Well, there is this, programmable via the USB with an Arduino IDE.

I'll be selling them on Tindie soon.

Not the same as a Teensy but it does have the 1 Mbyte flash. And an FPU.
 
Looks very much like a teensy to me :) How soon is soon? Where can I sign up for updates? Is this just a PC board, or will you be selling assembled boards?
 
Yes, I shamelessly copied the Teensy form factor since I like it so much. I just finished the second design rev which I intend to start selling on Tindie by the end of this month. The plan is to sell assembled and tested boards; we are working on the Arduino overlay now. It's not perfect (no USB OTG yet, only 4 Mbyte QSPI flash memory on board, super cap RTC backup) but all of the GPIOs are broken out, it is compatible with many of the sensor add-ons I sell at Tindie, and we have plans to keep improving it. The initial build will be hand assembled and be priced from $25 to $30 depending on component costs. If there is sufficient demand we will run off 500 or 1000 and in this case the price can come down to ~$20 a pop. You may also just have OSH Park make you some boards and you can assemble your own.
 
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