I have tried to power up the simblee board by other power sources instead of the rfduino usb shield. I connect the simblee boards with different scenarios (with different power sources), and i found out there are some problems.
I have attached a full picture of all scenarios (Attachment A). Not working means i cannot upload any program nor read the data from the sensor. It shows UART TIMEOUT FAIL...FAIL...FAIL...
Any help is greatly appreciated.