dtmf shield for arduino
{"Image Make": "HTC", "Image Model": "ADR6425LVW", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Picasa", "Image DateTime": "2014:02:03 10:14:42", "Image Artist": "Picasa", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "2452", "GPS GPSVersionID": "[2, 2, 0, 0]", "GPS GPSLatitudeRef": "N", "GPS GPSLatitude": "[44, 58, 2978/125]", "GPS GPSLongitudeRef": "W", "GPS GPSLongitude": "[93, 26, 8209/500]", "GPS GPSAltitudeRef": "0", "GPS GPSAltitude": "1288/5", "GPS GPSTimeStamp": "[14, 7, 38]", "GPS GPSProcessingMethod": "ASCII", "GPS GPSDate": "2013:05:23", "Image GPSInfo": "4756", "Image Padding": "[]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "5122", "Thumbnail JPEGInterchangeFormatLength": "6016", "EXIF ISOSpeedRatings": "117", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2013:05:23 09:07:40", "EXIF DateTimeDigitized": "2013:05:23 09:07:40", "EXIF ComponentsConfiguration": "YCbCr", "EXIF FocalLength": "431/100", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "599", "EXIF ExifImageLength": "599", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "Interoperability RelatedImageWidth": "3264", "Interoperability RelatedImageLength": "1840", "EXIF InteroperabilityOffset": "4986", "EXIF ImageUniqueID": "b8ddace5f27ef9e728f2894682acdeab", "EXIF Padding": "[]"}