21-06-2014, 06:09 AM
My project name is pc based voice announcement system.we are having Rs232 protocal nd max232 nd Ic AT89c52 nd speaker nd voice module . Rs232 is given to data to max232 it convert cmos logic to ttl logic then it goes to the microcontroler .so this received some data then controler is doing that work mean announce the data nd the voice module recognize nd announcing data using speakers