Arduino relay module bluetooth upgrade for android control.
Upgrading a basic 1 channel relay module to android bluetooth control.
For small size, im used attiny45/85.
Its works with parseInt, so accept only integers from android.
Im used 111 for turn on, and 222 to turn off, but you can change it.
Used android app:
https://play.google.com/store/apps/de...
Attiny code:
https://drive.google.com/file/d/0B6GR...
For more details, check the instructable: