Recently minoyo is involved in a design project with a elevator company to produce a programmable Speaker Phone System, this system will store a couple of emergency phone numbers to be dialed at the press of the communication button. This design is targeted towards home lift system where an immediate security personnel is not available during a breakdown.
This is the 2nd hardware revision using a Motorola Speaker phone chip which will switch between sending and receiving based on the sound level of the surrounding. Creating a seemingly full duplex operation. The dial tone is generated by the Microchip micro-controller to reduce the chip count on board.
It will go into production at the end of the month (April 2010), so if you go to a house with a lift press the call button and you will be using this baby.