[OpenTRV-dev] Anatomy of a TRV

[Stuart Poulton]

Fairly obvious, but thought it would be well worth covering just exactly what a TRV actuator is, and it's parts. I'm hoping to turn this into a graphical representation in the future.
Consider it a brain dump, not all TRV's need all parts.

Valve Body Actuator
	- Motor, Gear Train, actuator Pin

Motor Drive
	- H Bridge Circuit
	- Optical Rotational Sensor
	- Motor Current Measurement

User Interface
	- Push buttons
	- LCD Display
	- Rotary knob 
	- LED Indicators

Power Supply
	- 2xAA Batteries (typically)
	- 5V USB (Optional)

Communication Interface
	- RF 
	- Serial
	- USB
	- Ethernet
	- Xbee
	- ZWave

Brains 
	- Single Microprocessor