Hello I'm a bit new to Arduino and electronics. I'm using an Arduino Uno to hack some telephones to use DTMF to communicate between two arduinos across phone lines (much like the cellphone controlled robots). I am using a MT8870DE DTMF tone decoder right now (though I have some MT8888's). It generat…

Not enough voltage to trip digital HIGH pin

system May 5, 2013, 7:36am 3

Yea I tied the Arduino to the ground for the chip. Internal pull up resistors seem to get me a tiny bit more juice but not enough.

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