My fan worked fine, so I gave it WiFi
ellis.codes
My fan worked fine, so I gave it WiFi
1–10 of 97 posts
Re: My fan worked fine, so I gave it WiFi
#2[flagged]
Re: My fan worked fine, so I gave it WiFi
#3[deleted]
Re: My fan worked fine, so I gave it WiFi
#4Oh no don’t tell vornado this is possible and give them an enshittificafion pathway for their products
Re: My fan worked fine, so I gave it WiFi
#5I actually like this idea. Makes more sense than smart fridges. Would be cool if this ESPHome thing worked with RP2350/Rpi Pico 2.
Re: My fan worked fine, so I gave it WiFi
#6I don't like the notion of doing speed control by putting a digipot in series with a motor. It worked because the fan happened to be low enough power but it doesn't seem like the author gave thought to the power handling capability of the digipot. If the fan happened to be beefier he's letting the smoke out with this design.
Plus, this is more complicated than just doing PWM.
Re: My fan worked fine, so I gave it WiFi
#7ESPHome and homeassistant have been really great, just like a nice breath of fresh air in a world of cloud saas stuff.
Re: My fan worked fine, so I gave it WiFi
#8Why is there level conversion though if the digipot (MCP4141) is 2.7V to 5.5V?
Personally I'd just use breadboard, it's just a 8 pin IC and a ESP module, for a one-off hack..
Re: My fan worked fine, so I gave it WiFi
#9I don't like the notion of doing speed control by putting a digipot in series with a motor. It worked because the fan happened to be low enough power but it doesn't seem like the author gave thought to the power handling capability of the digipot. If the fan happened to be beefier he's letting the smoke out with this design. Plus, this is more complicated than just doing PWM.
Based on the description of the wiring to the motor (24V, GND, POT1, POT2, NC), it doesn't sound like the original setup would have been drawing much power through the pot either -- there's probably something else on the other end of that wire that is doing modulation based on the sense resistance, and the motor is itself drawing power from the 24V line. So while it's true that there should be a check for the allowable limits on the digipot, I don't think it's actually being used to sink much power.
Re: My fan worked fine, so I gave it WiFi
#10I don't like the notion of doing speed control by putting a digipot in series with a motor. It worked because the fan happened to be low enough power but it doesn't seem like the author gave thought to the power handling capability of the digipot. If the fan happened to be beefier he's letting the smoke out with this design. Plus, this is more complicated than just doing PWM.
Based on the description of the wiring to the motor (24V, GND, POT1, POT2, NC), it doesn't sound like the original setup would have been drawing much power through the pot either -- there's probably something else on the other end of that wire that is doing modulation based on the sense resistance, and the motor is itself drawing power from the 24V line. So while it's true that there should be a check for the allowab…
Hey, author here. That's correct. The potentiometer has 5V going through it, with a current range of 30-164μA, which fell within limits of the digipot. I opted to use the digipot instead of my own PWM because something else must be doing PWM closer to the motor, where I didn't want to go modifying.