As low as $10 if you all components are from JLCPCB's basic component library. For this board, more since there are some through-hole components and neither MCP4141 nor ESP32 (nor the buck modules used) are in the basic library.
> there's probably something else on the other end of that wire that is doing modulation based on the sense resistance
And it would have been great if that arbitrary assumption had been tested by the OP and the results were documented in the article so that they wouldn't come off as somewhat clueless as to the limitations of their design.. oh well.
These passive aggressive posts are a far worse violation of the HN Guidelines than what they're in reply to almost all of the time - and this is no exception.
No, no they're not. I would much rather people are warned about the guidelines and adhere to them going forward than the opposite and we then just let violations run rampant.
There are a lot of people who read or watch stuff from the Internet and then play with mains voltages without giving a though to how dangerous that is.
See: any craze which uses the high voltage transformers from microwaves
Hey, author here. There's a line in the digipot datasheet that says the voltage on the A/B/W pins must be within -0.3V to VDD + 0.3V. The fan's line for the wiper pin is 5V, which would fall well outside of that if I gave the digipot's VDD 3.3V.
Fair point, I hadn't thought to consider that aspect of the ESP8266. I mainly opted for the shiny new ESP32-C6 with the idea that I might one day set it up to use Thread instead of WiFi.
There’s a Linux version of Resolve that works fine as long as you have NVidia and don’t mind transcoding m4a audio tracks to PCM (some codec licensing issues I think)
Southwest's 737 MAX contract had a penalty clause of $1 million per aircraft that would trigger if Boeing's delivery contract for the 737 MAX failed to meet certain standards, particularly Southwest's insistence that no flight simulator training be required for the MAX
Meaning, the roots of the “no new type rating” requirement come from Southwest, not Boeing.
This is an interesting detail I had not heard. Can you link to a backstory on this? Why would such a contract ever be signed (especially for a technological product)?
Basically they were looking for an edge against Airbus and a really big one was being able to promise that pilots wouldn’t need a separate certification from the existing 737, which is where that MCAS software came in trying to make the new hardware behave like the existing planes. The allegations about Southwest in particular got the most attention in this lawsuit:
I'm sure the SD thing works for you but some people need music discovery and open source options are lacking there. When you can set up a radio station backed by RED/Lidarr and not have your account go on ratio watch in hours, then we'll talk..
I'm pretty sure that PlexAmp, backed by Plex Media Server, is the pinnacle of music discovery, within whatever you've got in your library. I've got that serving an enormous library that I've compiled through my whole life, but there's no reason (well, other than legalities) you couldn't feed this through the *arrs.
The discovery algorithm works based on fundamental metadata, additional data pulled from Last.fm (e.g., "related artists" and "popular tracks"), as well as its own acoustic matching algorithm.
This arrangement obviates the SD card, and also any other external syncing (PlexAmp plays live from the server, or has its own scheme for downloading to a local cache).
I guess that gets to what each of us means by "discovery". I think you're talking about the existence of a given artist/track. But for me, with a sufficiently large library, it can be difficult to remember what you have, and what would go well in a given context. So PlexAmp's "discovery" helps me to navigate through that large library to find and re-experience stuff I'd forgotten about or overlooked.
On my case that is achieved by getting down to the local record store, radio, whatever comes up in YouTube algorithms, somehow I get more music than I can manage to listen to.
ESP32 has inherent sleep issues and before their latest chip (c6 I think) 'deep sleep' was really a gpio- or rtc- triggered boot followed by a power off. Doesn't mean it's impossible to implement wifi sleep efficiently, but if you do the math anything wifi based won't work off cr2032 for even a year unless daily updates is all you need. Motion sensors are supposed to fire more often, and with much less latency that can be done via WiFi, so it doesn't really work for battery powered sensors in the general case. You could probably use ESPNow and a custom gateway node but at that point it's just another custom RF protocol and you're better off with something standard like 802.15.4 or BLE..
You can put the ESP32 into deep sleep, and it can wake based on a timer, or it can run the ultra-low-power core which is a very slow, very low memory, very low power core. It's good enough to look at ADC or I2C devices and do a little math. This can be woken up fairly frequently to check a sensor, and say, compare against a previous measurement, and then wake up the main core if you need to process the measurement or do WiFi.
I think you're right that this won't work well with a CR2032, but if you're careful about using good voltage regulators it can last a long time on 4 AAs.
> I've been burned by trusting Matter to mean broad compatability; my Aqara lock doesn't indicate how the door was unlocked over Matter despite showing up in their app, and this is after having to buy their Zigbee bridge because it won't connect to Zigbee devices from other brands.
Matter was made by the same guys that created Zigbee, proprietary vendor extensions are their bread and butter. Anything trickier than a contact sensor or motion detector, you should definitely research compatibility and definitely not update firmware once it works.
> I usually take my smart devices with me when I move.
Considering you can't even set up Matter devices if you lost the enrollment QR code (and the manual enrollment code is printed on the back of those ceiling downlights), it's a very good idea to take them with you and avoid frustrating the future occupants :)
Yeah as noted I don't have any Matter-based systems. Also, all of mine are designed to work with or without smart components: Aka, a light switch turns on or off the lights when you touch it.
