Hi Rich,

The Overo connector symbol in the Eagle schematics confusingly does not have its pins in numerical order (which is probably why no pin numbers are shown). The pin-out listed on the website is the correct one. 

Creating a custom board is pretty straight forward if you completely ignore the confusing Eagle schematics ;-) The only thing to watch out for is level translation; you probably want to use something like a 74AVC16245 for the GPIOs and serial port, and a PCA9306 for the I2C bus. All the required circuitry for the USB ports is on the Overo COM itself, so you won't need e.g. any level translation for that. 


On 26/06/2009, at 11:48 PM, ratkid2271@comcast.net wrote:

Hello All,

I'm trying to build a simple expansion board for the overo with a few simple ports.  Ideally, i'd have 1 serial port, 1 i2c port, 1 usb port, and a simple 3 pin connector for GPIO (VCC, GND, IO).  The problem i'm having is that the eagle schematic for the board and the documentation on gumstix.net don't seem to match.

For example:  There are some UART pins for the overo connector.  The TX pin in the documentation is pin 26 and the RX pin is 31.  In the eagle schematic, the two pins are right next to eachother (roughly pins 26 and 27).  So which pins should i use?

Alternatively, if you've create a custom board before and added any of the ports i've mentioned above, could you tell me which pins you connected them to on the overo?

Thank you very much!

Rich Ratmansky
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