Intermittent programming problems using HC-05 Bluetooth module

A while back I knocked up a simple circuit to connect a HC-05 Bluetooth module to a Pro-Mini (or any other device with the same 6 pin FTDI programming header) so I could program wirelessly over Bluetooth.

This tested and worked okay so I got some boards knocked up and the one I built up works fine for the first time I try programming from the PC but after that I can still connect and see/send serial data but cannot program the device again unless I reboot the PC and power cycle the Pro-Mini. This seems like a BT driver problem on the PC (Windows XP) but I thought I should throw the question out here in case anyone else has other ideas.

HC05_Base.pdf (8.03 KB)

HC05_Board.pdf (17 KB)