Overview
- Object ID : 2504 (2013-04-11)
- Author : eod_punk | added by Archiver
- Content : Code
- Microcontroller : Propeller 1
- Language : SPIN
- Categories : Human Input, Protocol, Signals, Speech and Sound
- Licence : Other
Content
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.