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4
  • Are you actually using softwareserial? On the leonardo you are probably using the hardware UART, so you should remove that tag. In terms of your problem, have you received any data? If it is failing in both directions you likely have not paired the devices, have the baud rate misconfigured or your Android app is broken. Commented Aug 7, 2016 at 17:47
  • As I wrote receiving data works fine. I cannot only send data from arduino. And I've deleted the tag. Thanks for noticing. Commented Aug 7, 2016 at 17:56
  • Do you have BT module with 5V to 3.3V level shifter? Does BT module works if you wire it as loopback (tx pin connected to rx pin without arduino)? Commented Aug 7, 2016 at 18:13
  • I've tried connecting it as loopback but it doesn't work either. My module is Sparkfun mate gold Commented Aug 8, 2016 at 14:43