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MT8870 DTMF tone decoder by lfmiller27

dl Based on Arduino Basics MT8870 code
Based on Arduino Basics Blog: MT8870 http://arduinobasics.blogspot.com/2015/08/mt8870-dtmf-dual-tone-multi-frequency.html 4 and 2 seem to be inverted 3 and 5 seem to be inverted

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