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    Xadow - GSM Breakout The Xadow GSM Breakout draws out 30 pins from the 35 pin Xadow connector to five rows of 0.1 spaced holes with 0.1 spacing between adjacent rows. If you solder wires or through-hole pin headers directly to the breakout pads, you can easily access: - Up to 16 General Purpose Inputs/outputs (GPIOs) - Interfaces like SPI, I2C, UART, etc. - Pinout related to peripheral devices like speaker, audio headphone and microphones Hardware Overview How to use it Pin Definitions   If your project is built with Arduino IDE, please refer to the "Pin Definitions for Arduino IDE". If your project is built with Eclipse IDE, please refer to the "Pin Definitions for Eclipse IDE". Notice   Some pinout might be occupied if the corresponding module is operative in the system. Please check the availability of the pinout of the Xadow GSM Breakout before using it. And also, do make sure you know exactly about the voltage level at each pinout (2.8V or 1.8V), irreversible damages might occur if you mismatch it with a system working at a higher voltage level. RePhone Community We’ve been looking for a better place where our backers (RePhone Users) can sit together, warmly and comfortably, have conversations about RePhone, discuss technical problems, share ideas/projects, and give feedback on the modules’ development in the future. And then here we go, the RePhone Community. Now join us in the RePhone Community! Together we seek answers, make interesting stuff, care about each other, and share our experiences.                                                                                                         http://wiki.seeedstudio.com/Xadow_GSM_Breakout/ 9‐10‐18