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For this Wireless Accelerometer / Tilt Controller version 2.5 - RP-SMA device, I try to connect to it from my cell phone. My cell phone requires the pin / passkey for this bluetooth device. What is that pin? I tried the usually 1111, 9999, 0000, etc. But they did not work.
Thanks. 
Tried a blank pin too? The blueradios have a default passkey of “default”. :roll:
You may need to connect to it from a PC and change the PIN with “+++” then “ATOP,newpin”. But if the module is configured to start up in Fast Mode you’re most likely out of luck, as it won’t respond to the “+++” needed to drop it into command mode.
hold on, I am new to this thing. Let us get some details.
When you say “connect to a PC”, do you mean I need to find a physical cable to connect it to a PC? I tried to pair it with the PC’s bluetooth, but the PC did not even pop up a dialog for me to input the pin.
On the cell phone, its GUI does not allow me to input a blank pin. 
Do we have any detailed step by step on this?
Thanks a lot.
The unit comes with instructions; they’re available on the product page…