variety of simple beep-beep noises. The volume controls are set using the TWI bus and the
amplifier chips can report error conditions back to the SAM 3X8C.
3.10 Front Panel Controls
The Fortress clock has three front panel controls/devices. Z3 is a PIR sensor used to detect room
occupancy. When the room has been unoccupied for a period of time the clock goes to sleep. Z4
is an IR receiver and the clock then uses a small IR transmitter handset which can be used to
select the clock “face” to use, adjust the audio amplifier volume settings, etc. Finally, S2 is a rotary
encoder that again can select the clock “face” and adjust the chime volume.
The components shown above are mounted on their own PCB which is arranged to be vertical so
the controls face into the room.
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A short ribbon cable provides
power to the controls and returns
their signals to the SAM3X8C.
Содержание An E1T Timepiece
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Страница 120: ...E1T Data Sheet Page 120 Version 1 0 Copyright Grahame Marsh Nick Stock 2019...