I'm Currently doin a project using voice recognition to unlock a door. Im planing to use the PIC16F877 microcontroller.Is it possible?? Im havin difficulty to start on the microphone circuit, the filter circuit which allow the range of 300-3400hz to pass through. Which kind of filter should i use. Im also havin dificulty on the Aanalogue to Digital conversion of voice to allow the microcontroller to recognize the input. How should i build it?? Finally im using mplab to program the microcontroller for it to recognize the input voice of 80% accuracy to unlock the door? Do u hav any idea how should i wrote it??