timothyb89

в прошлом месяцеdiscuss

Fair point, I’ve been evaluating WiFi for my project as well and the ESP32-S3 certainly has better link rates and latency, though I’ve not determined if it can truly run uncompressed. UX-wise my project is pairing to a smartphone so I’m not eager to require that users bring a WiFi network with them (something neither Android or iOS handle particularly gracefully), but regardless it would be good to have the option.

timothyb89

в прошлом месяцеdiscuss

I’m using BLE GATT messaging with an upgrade path to L2CAP CoC channels for clients that support it. Roughly the path is: audio input -> opus encode -> BLE transmit -> smartphone/desktop. The latency floor ends up being ~80ms due to jitter buffer sizing, etc.

timothyb89

в прошлом месяцеdiscuss

I've been experimenting with more-or-less this on the existing ESP32-S3 (well, to a smartphone/PC rather than a 2nd ESP32).

Practical bandwidth limits are in the ~72kb/s range with Bluetooth and a custom wire protocol, and Opus voice-mode encoding can't run in realtime beyond complexity 3; music encoding can't run at all. Maybe there's a more compute-friendly audio codec I'm not aware of, but as far as I know these chips just aren't quite powerful enough for high-quality music encoding, unfortunately. I'm hoping the S31 might be a bit better fit here (decent CPU boost + better SIMD).

Latency is still a bit rough with BT overhead. There might be some new options with LE audio on the S31 but I haven't found a way to get below ~80ms with the existing ESP32-S3 stack.

tl;dr, high quality voice is doable today with okay latency, music probably less so, maybe the S31 will be better

timothyb89

2 года назадdiscuss

I've been experimenting with the ALFA HaLow HAT [1] for some personal projects. There's also a number of APs good for point-to-point use.

[1] https://www.sparkfun.com/products/19956

timothyb89

2 года назадdiscuss

I've been using it for light CAD work to design stuff for (hobbyist) 3d printing. You can use exact measurements just fine. The main issue is that it isn't parametric but for my needs that isn't a big issue, and the one-time $150 pricetag is wildly easier to swallow than a Fusion 360 subscription.

It's a lot like Blender, if Blender was a few degrees more usable for CAD. That said, I've yet to try the Blender CAD Sketcher addon (https://www.cadsketcher.com/).

timothyb89

3 года назадdiscuss

For what it’s worth, the Pixel 7 series (and maybe 6) has compatibility issues with some wireless chargers. It’s actually quite quick if you find one that plays nice: I measure 12-15 watts, so not much slower than wired. Incompatible chargers pull 3 watts or less, disconnect frequently, and often don’t even offset the phone’s regular drain.

I had to try a few to find one that works properly in my car. I’ve had good luck with chargers from Anker and Peak Design, and bad luck with Apple, JSAUX, and Spigen branded chargers. Google’s own chargers presumably work fine as well.

(Also, a lot of Qi chargers are extremely picky about the USB-PD or QC specs of the power adapter you use. I highly recommend using a USB power/voltage monitor to make sure they negotiate PD or QC power at 9/12v rather than the base 5v/1a. Without that, you’ll be charging at an absolute maximum of 5 watts before Qi losses.)

timothyb89

4 года назадdiscuss

GEOS (a Garmin subsidiary) offers this for most devices on the Iridium network, including Zoleo and Garmin's own inReach communicators: https://my-geos.com/products

I have a Zoleo device and pay for the $40/yr coverage. You just register your device's IMEI with them.

timothyb89

4 года назадdiscuss

Most dealers don't do this, though admittedly as another commenter mentioned, this isn't stopping the all the less scrupulous dealers.

I paid MSRP for a Mach E I ordered online with relatively little fanfare, albeit with a ~10 month wait and a model year bump (for which Ford gave me a discount off the slightly higher MSRP).

timothyb89

4 года назадdiscuss

By far the simplest solution is to just crack a window. Even a modest amount of fresh air exchange is enough to offset most of the CO2 generated by the people inside.

I use a relatively small 10x11ft spare bedroom as my home office. If I close the door and window, it'll quickly climb above 1200ppm after 15-30 minutes (and set off an alarm on my sensor). It'll cross 1500ppm easily if left unchecked. HVAC helps but gets outpaced quickly if my apartment windows are all closed.

That said, keeping doors open, running HVAC normally, and cracking a small window open, even 1-2 inches and on the opposite side of my apartment, is enough to keep CO2 levels around 550ppm while sleeping and 700ppm (in occupied rooms) while awake.

timothyb89

4 года назадdiscuss

I have one of the Anker batteries. It'll happily take in >1000W from an AC wall outlet to charge fully in ~1hr. It's 300W max DC input from solar (which is where that 3.6hr number comes from) or 100W max from a 12v car adapter.

Those other batteries you linked look like a potentially great deal for raw capacity, though there's something to be said for having a mostly portable package with thermal management and a bunch of different inputs and high-powered outputs.

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