Today we are building a very useful project in which we can control the LED lights using our voice through Smart Phone. In this project, we will send voice commands from Smart Phone to Raspberry Pi using Bluetooth Module and Raspberry Pi will receive that transmitted signal wirelessly and will perform respective task over the hardware. We can replace the LEDs with the AC home appliances using relays and can build a Voice Controlled Home Automation Project.
 
Working of this Voice Controlled LEDs project is very easy. In this project we have used three LEDs of different colors (Blue, Red and Green). A HC-06 Bluetooth Module is used for receiving voice commands output in string format. Raspberry Pi receives that incoming string from Bluetooth Module and compares with predefined string and performs respective task.
In this project, to provide the voice commands to Raspberry Pi from our Smart Phone, we have used AMR Voice App in Android Phone (Android Meets Robots : Voice Recognition).
AMR Voice App installation and configuration:
AMR Voice App can be downloaded and installed from the Google Play Store. You also need to install Google Voice App for this project. AMR Voice app takes the voice as input and converts it into text string using Android mobiles internal voice recognition (Google Voice App) and sends this converted text serially over Bluetooth.