Our device send command to take picture of camera (command will be send thru UART). Once picture is taken need print : Timestamp, BAC value and Test no. We will send all these values thru UART and store the picture in SD card.... You can select any camera (need to keep in car) with UART and need to add memory module. Please find picture of camera and also specs. In simple words text overlay on the picture with BAC value sent thru UART(in general time stamp will be there in all images we need add BAC).