> I'm getting erratic behaviour when attempting to attach to my Gumstix(basix
> 400xm-bt with root_fs_arm.r1161)/Robostix stack via Bluetooth. All I want to
> do is use a Bluetooth Serial Port as my console. I have the pullup resistor
> installed across pins 3 and 4 on the Gumstix port on the Robostix and the
> red LED always flashes correctly. If I don't have any sensors attached to
> the Robostix I can usually get the serial port to show up to my Windows box
> after rebooting the Gumstix a time or two. If I have a sensor (VEX light
> sensor) attached to an ADC port on the Robostix, I can NEVER get the serial
> port to be available to Windows. If I boot, get the BTSP working, and then
> attach the sensor without rebooting, everything works great and I get good
> data with i2c-io. Does this make any sense? I'm powering the Robostix with
> the supplied 5V brick.
It's probably a case of the sensor and bluetooth drawing too much current.
Try powering the bluetooth adapter using a separate regulator. Make
sure you connect the grounds together, but only connect the 5v from
the regulator to the power for the bluetooth adapter.
Vancouver, BC, Canada