[OpenTRV-dev] The news !

[Stuart Poulton]

> The opto-reflective switches are for counting revs.  They detect 
> end-stop either by current (possibly easiest for detecting off-load) 
> and/or load related changes in rotational speed.

Having seen the circuit diagrams, there is no measurement of motor 
current. It's the same mechanism as used in the HR20's from honeywell, 
which is to simply look for the motor to stop turning.

In the case of the 'common mechanism' one of the drive gears has 3 
silver disks on it, which match the location of the optp reflector.

Stuart