apostolakisl Posted January 13, 2021 Posted January 13, 2021 The Insteon 10v dimmer, for whatever reason, is not a sinking voltage. Instead of sinking 0-10v to ground, it provides 0-10v of output. So it would work on theater lights . .. who has those? Anyway, I am trying to figure out how to get ISY to dim my 10v dimming lights and basically need a pot that sinks the 10v control voltage to ground. infinity resistance and the lights are on full, zero resistance and the lights dim to almost off, and everything in between. I found this https://www.adafruit.com/product/4286 Anybody know anything about this? I would like ISY to control it, but I just don't know how to interface it.
larryllix Posted January 13, 2021 Posted January 13, 2021 (edited) 2 hours ago, apostolakisl said: The Insteon 10v dimmer, for whatever reason, is not a sinking voltage. Instead of sinking 0-10v to ground, it provides 0-10v of output. So it would work on theater lights . .. who has those? Anyway, I am trying to figure out how to get ISY to dim my 10v dimming lights and basically need a pot that sinks the 10v control voltage to ground. infinity resistance and the lights are on full, zero resistance and the lights dim to almost off, and everything in between. I found this https://www.adafruit.com/product/4286 Anybody know anything about this? I would like ISY to control it, but I just don't know how to interface it. The I2C interface is very popular on the arduino and RPi areas. It is a serial interface using four wires. Common, Data, Clock and usually Vcc. AFAIK the two boards provides a hardware serial port that gets encoded onto the lines and talks serial to boards. AFAIK there are 256 addresses. I have 4 servo controllers boards that can handle 64 servo motors quite nicely from a RPi CPU board. AFAIK you can just daisy chain your I/O devices on the same bus and control them all. I have one board for 16 servos working at the moment from a RPi 1 I am thinking you could use a RPi 0 or an Arduino board to interface WiFi to this Digital Potentiometer to do your job. You could stick a set of boards inside each fixture or one in a RF transparent box and run an I2C bus to each fixture. Perhaps you have a central 10v dimming hub they could be shoved into? Edited January 13, 2021 by larryllix
ELA Posted January 16, 2021 Posted January 16, 2021 (edited) if you already have the Insteon sourcing device and want to convert to sinking here is a similar discussion: https://cr4.globalspec.com/thread/107842/Convert-Sourcing-0-10v-to-0-10v-Sinking It would take some experimentation if you are up for that. Edited January 16, 2021 by ELA
apostolakisl Posted March 16, 2021 Author Posted March 16, 2021 @ELA Thanks for the link. Missed it when you posted. This is exactly what I am looking for . .. I think.
apostolakisl Posted March 19, 2021 Author Posted March 19, 2021 @ELA Not an EE, but looking at how that worked, I think it might produce backwards results. 10v sourcing dimmers output 10v for max brightness, 10v sinking dimmers have an open circuit for max brightness. If I understand this circuit correctly, this would do the opposite.
apostolakisl Posted March 19, 2021 Author Posted March 19, 2021 @ELA Not an EE, but looking at how that worked, I think it might produce backwards results. 10v sourcing dimmers output 10v for max brightness, 10v sinking dimmers have an open circuit for max brightness. If I understand this circuit correctly, this would do the opposite.
ELA Posted March 20, 2021 Posted March 20, 2021 As stated it would take some experimentation. There were two examples given. The idea being that with a few components you can translate the signal to be the configuration you need.
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