My present layout (on the screen now) extends the Raduino width about an inch or so to the right (inside). The Pill board is set in toward the left about 1.5", leaving room on the right for a very short USB pigtail from the Pill USB connector that solders to the Raduino board. There's a Micro USB connector on the Raduino board that connects to all the USB signals from the pigtail, but has a breakout for a Schottky diode in the 5V path. All of this should fix the dual-power problem while allowing an unmodified Pill to be used.
I'm providing a couple connectors for the I2C bus and the SPI bus, and all the unused Pill I/O's will go to yet another connector. I'm putting a capacitor coupled DC voltage divider on one of the Pill analog inputs for audio input to drive my software S-meter. Perhaps there should be optional voltage dividers on other analogs?
For now, I'm calling this the "Raduino Pill".
Comments/Suggestions?
Joe
W3JDR
