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I can send data from Android phone to arduino via bluetooth mmodule using Processing sketch. I can send "1" or "0" to control the leds in the Arduino. My question is, can the Arduino also send data to the android device? I know it can send numbers i.e (Temperature Sensor from Arduino) but can it send words? Our goal is that the Arduino will send a string of message like "Go to the right 10 steps" (our project is navigation for blind person).