hi SurferTim
I use equipment list
Arduino Uno(http://arduino.cc/en/Main/ArduinoBoardUno/)
SD shield(http://www.seeedstudio.com/depot/sd-card-shield-p-492.html?cPath=109)
series two 3.7V 1100mAh battery(like Arduino Playground - 9VBatteryAdapter)
I used USB to computer always success(not loss data to sd card)
but because some required i need go out
so i can't use serial monitor
thank very much.