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Smart Home Forum by FIBARO Team
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I already read this previous topic dealing with classical in-wall rotary dimmers and the Fibaro dimmer2 module, but I think the following combination would work better. Your advice would be very much appreciated. The RGBW dimmer (FGRGB-101 / FGRGBWM-441) accepts 0-10V analog voltage input to control 12/24V DC low voltage lamps (LEDs or halogens): 1/ Can a cost-effective classical 0-10V rotary dimmer pilot the RGBW module which would then dim the lights accordingly to the input rotation? Like this one for example: 2/ If it works that way, how would the knob rotation of the 0-10V potentiometer behave with the direct control of the RGBW module from the Fibaro interface on a computer or mobile device? Suppose you have turned the potentiometer half the way to dim the lights up to 50%. Then you open the Fibaro app and switch off the lights. Do the lights switch off? If they are switched off, the potentiometer is still at 50%… What would happen then when you turn the potentiometer again? 3/ To prevent this apparent weird behavior, I looked for 360-degree (i.e. continuous rotation with no stop) optical or Hall effect absolute rotary encoders with 0-10V analog output, as a replacement for classical potentiometers: But in this case while the voltage varies linearly according to shaft rotation from 0V/0° to 10V/359° (1 turn) it also suddenly drops to zero at the beginning of the second turn (the voltage drops from max. 10V at 359° to 0V at 360°, just one degree further) like this: This graph is for 0-5V but 0-10V acts the same way. Not very handy for lights. It would have been more useful if the voltage stayed at maximum value of 10V after 360°. 4/ I then searched for incremental rotary encoders instead of absolute rotary encoders, but it seems an incremental version with 0-10V analog voltage output doesn't exist. Your thoughts?