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By: created: 2013-04-11 | updated: 2013-04-11
MT8880 DTMF Transceiver
This object uses a 74LVC244 buffer in between the Propeller (3.3v) and the MT8880(5v). It also uses a PN2222 NPN transistor to select one of 2 buffers in the 74LVC244.
The separate demo shows how to Send DTMF and receive 4 digits via DTMF and compare them to known 4 digit codes in the DAT block and turn an LED on and off.