I ve installed CSR bluetooth 4.0 adapter , it can communicated with even the bluetooth 2.0 devices, how ever it even can not discovery the board when I programed the softDevice and project under s110. what is wrong?
Small size is not a problem, for example XR21V1410 in QFN16 and a few external R and C. It will be seen on PC as COM-port and will use standard driver.