Tweets
once again I have no sleep data because I forgot to charge my apple watch last night. Honestly how do we live with these gadgets?
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Replying to @dcelectr
Wow, I can’t tell if this is deeply cursed or not. I love it!
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found: white-on-white text in a PDF: ‘Please fill in the table and then change the color to “white”. This ensures that the table disappears (invisible) for the customer.’
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Replying to @tahnok and @digikey
me too! the best part is, not only do not know if this is the right part for the job, I can also stare at all the graphs in the data sheet and come away with the definitive answer of “LOL IDK, maybe? I guess we’ll find out in a couple of days!” https://www.tdk-electronics.tdk.com/inf/20/10/ds/0909H011V060.pdf
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Behold! The 24-FCGQFN Fingerlike Cellular Groundbreaking Quad Flat No-lead package! https://backronym.org https://twitter.com/GregDavill/status/1481814961446096897
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Replying to @GregDavill, @KeanM and @digikey
this one’s not a WLCSP, tho! it’s just a… 24-FCGQFN, whatever that is? (when I google that footprint, the part we’re talking about is the only part that shows up)
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Replying to @tomfleet, @digikey and @NordicTweets
Could I break that kind of package out on a 0.1mm flex PCB tho! I always assumed these WLCSP type things required filled vias and extra layers for fanout. I’m constrained on the x-y and the z axes here :)
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Replying to @tomfleet and @digikey
I just found this document while researching their “CodeLess” concept today, and sensed that there was enough there to start exploring at least. http://lpccs-docs.dialog-semiconductor.com/UM-140-DA145x-CodeLess/atcommands.html
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Replying to @KeanM and @digikey
I ordered the module; there’s an OSHW breakout for it that should let me get started on a breadboard. Figure it’s better to start there and see if I can make it work, then move to designing a sensor watch accessory board if I see it can work in theory. 🤞🏽 https://github.com/kattaliraees/DA14531MOD-Breakout
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Replying to @enzinolombardi and @digikey
I can feel it already: this is going to be the thing that forces me to grok RF.
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today’s backer questions nerd-sniped me into a @digikey order. The DA14531 is a 2.2×3mm (sensor board sized!) BLE chip that responds to AT commands over a UART. And then, I’m honestly just curious what would happen if I were to zatz this 9×9mm piezo motor with a 3V square wave.🤔
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in my head today, one of the greatest covers of all time: https://youtu.be/ainyK6fXku0
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Replying to @josecastillo
Ongoing discussion is happening here; Rohan also shared the STEP file in this thread, which I understand is a format that lets you tweak these things with more granularity? I’m gonna be honest, I’m out of my element on this one 🙃 https://github.com/joeycastillo/Sensor-Watch/discussions/33
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Replying to @arturo182
I voted for 1.0 mm because I’m trying to use it more. New Open Book revs are in 1.0 mm, and so is the castellated module I designed for it (to match the Pi Pico’s thickness). Thinner for going into an enclosure, and rigid enough; I can’t think of a reason not to make it my go-to.
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Replying to @josecastillo
Here’s the STL! All credit to the original creator, and to my colleague @rohansingh who made the necessary tweaks to the model (namely: the cavity for the watch movement was 2 mm too short, so he moved the top up and the bottom down by 1 mm on each side). https://github.com/joeycastillo/Sensor-Watch/files/7866174/plastik-dis.stl.zip
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Speaking of 3D printing: would you believe that some kind soul (“Benan” on GrabCAD) has shared with the internet a fully modeled F-91W suitable for 3D printing? We tried printing the watch case here; with one minor tweak, the movement fit perfectly! https://grabcad.com/library/casio-f-91w-watch
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Replying to @enzinolombardi and @adafruit
okay, now you’ve nerd-sniped me. searching DigiKey for BLE and sorting by smallest yielded two interesting possibilities (one admittedly marked obsolete):
https://www.digikey.com/en/products/detail/dialog-semiconductor-gmbh/DA14531-00000FX2/10474881
https://www.digikey.com/en/products/detail/asahi-kasei-microdevices-akm/AK1595/12418132(original)
Replying to @enzinolombardi and @adafruit
I have my doubts. For one thing, the area available for extra parts is very small (5.7×5.7×1mm). It would have to be a tiny chip with very few external components required. And I don’t know where you’d stash the antenna. Some talk on size constraints here: https://github.com/joeycastillo/Sensor-Watch/discussions/31
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Replying to @gregoryknauff, @emmafletcher, @MakeAugusta, @CRImierTech and @SD_Robotics
Yes it is! I realized that I wasn’t making good on the promise of “an ebook you can solder yourself” as long as that fine-pitch flex connector was there. So I had this module fabricated. It provides the necessary boost for any SPI-based e-paper display with the standard pinout.
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Replying to @josecastillo
some more details. This is all at 0.2mm layer height optimizing for speed, so I’m sure it gets better as I go finer. but this lets me print both halves plus the lock button in under two hours :)
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Replying to @Mobile_Dom and @the_prepared
It was a Monoprice Maker Select that I got open-box for cheap. I also fell down some stairs with it during one of my cross-country moves a few years back, so I’m not surprised it wasn’t ever fully dialed in. 😅
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Replying to @Mobile_Dom and @the_prepared
yea I’m just printing in draft mode while I iterate… still it’s worlds beyond what my old printer was capable of!
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We recently got a new FDM printer at our workshop @the_prepared (a Prusa i3 MK3S+) so I’ve been revisiting the enclosure design for the Open Book. This isn’t the latest Pi Pico book, which is sitting unassembled with other pre-watch projects, but these prints are worth sharing :) https://twitter.com/josecastillo/status/1481689268049305603
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Replying to @emmafletcher, @MakeAugusta, @CRImierTech and @SD_Robotics
Thank you! I plan to get back to it this spring, once I have some free cycles from getting the watch further along. Here’s some of the latest case designs for the Pi Pico-based one; there’s also an ESP32-S2 version that retains Feather compatibility :)
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Replying to @arturo182
0.6mm. It’s just one design. but it’s the thing I’m doing most often these days :)
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Replying to @BigMac106
Yep, you take apart the F-91W & the Sensor Watch board just fits; it’s all screwdrivers and snap fit, except for one optional bit of soldering if you want the buzzer to beep.
NFC module: doesn’t exist yet! We have hopes but no guarantees. Discussion here: https://github.com/joeycastillo/Sensor-Watch/discussions/31#discussioncomment-1958228(original)
Replying to @josecastillo
UPDATE: it’s definitely just stronger. but hey, some mornings, that’s enough.
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my cold brew looked weak yesterday so I gave it another 24 hours to steep, and now I’m trying to figure out if it’s better or if it’s just stronger. It’s hard to form opinions first thing in the morning.
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Replying to @MakeAugusta, @CRImierTech, @emmafletcher and @SD_Robotics
Funny, I was just revisiting this yesterday. We got a new FDM printer at the shop so I was playing with a reprint of the enclosure. I should share some pics when I get in later today :)
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Replying to @ruptes
Having said that, I would check out another great @crowd_supply product, Watchy by @sqfmi. It’s a rechargeable e-paper watch, and it makes a different set of design tradeoffs to support both Bluetooth and a haptic motor. Might be what you’re looking for! https://www.crowdsupply.com/sqfmi/watchy
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Replying to @ruptes
I’m not certain, but my instinct is that it’s not likely. One of the keys to the long battery life in Sensor Watch is the really low power draw: 10 µA in sleep mode, 30 µA while active. Alas, I sense that adding a radio and a motor would quickly deplete the coin cell…
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RT @tarahaelle: This is an excellent, nuanced, thoughtful discussion of what we do & don’t know about long Covid and what that means for va…
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Replying to @josecastillo
Phew indeed. also feel free to mute this thread, i’m just doing this for me at this point.
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Update numero uno: we made it! The big news here: if you want to see news of the watch (+ some new stuff it can do) I’ll be joining @adafruit’s weekly Show & Tell tonight at 7:30 EST. That’s just under 90 minutes away! Link’s in the post; I’m super stoked! https://www.crowdsupply.com/oddly-specific-objects/sensor-watch/updates/fully-funded-in-23-hours-whats-next
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Replying to @mikko and @WarrenPlatts
Alas I don’t think it will work with the “Illuminator” type watches, as the inside of that watch case is laid out differently. The only ones it’s for sure going to work with are the F-91W and other watches with F-91W in the name (e.g the F-91WM in all its colorways).
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RT @AlpenglowInd: Congrats, Joey! It’s been awesome to watch your progress on this.
If you haven’t checked out Sensor Watch, it’s a sup…
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Replying to @cushyChicken
I mean to be fair, my subconscious also stuck up for me!
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Replying to @GregDavill
Thanks, Greg! And thanks for the pointing me in this direction with arm-watch; this whole thing started a month after your advent calendar of circuits :)
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just woke from a dream where someone (me) was critiquing choices I made in my watch firmware. some good points, but at the end he said “face it, you’re not good enough.”
Friend, let me tell you, I ripped that asshole a new one without missing a beat. (may still use his ideas tho)(original)
Replying to @travisgoodspeed
You misspelled “inspiration” :)
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Replying to @josecastillo
I was so close on this one.
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Replying to @jit_j
If it’s a genuine Casio watch and it has that dim green (or orange) LED backlight on the left, odds are it might work. If it has the blue full-screen EL backlight (“Illuminator”) odds are it won’t. Haven’t tested with an A158 yet, but I will take a look around for one to try out!
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Replying to @josecastillo
also LOL, I am bad at marketing. The link, if you want to join the club: https://www.crowdsupply.com/oddly-specific-objects/sensor-watch
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Y’ALL! YOU DID IT! 236 backers in what, 23 hours? I am so stoked that y’all are so stoked about Sensor Watch! More to come soon; for one thing, I need to write an update!
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Five more boards will do it! https://www.crowdsupply.com/oddly-specific-objects/sensor-watch https://twitter.com/fpgahelper/status/1481041079533117441
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RT @rohansingh: I am really, really excited about my shopmate @josecastillo’s Sensor Watch kit. And not only because he says we can have a…
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Replying to @dothebart and @crowd_supply
ah no the buttons are just meant to be buttons, you can press on them to interact with the MCU, but they’re only meant to be inputs that go high when pressed and low when not.
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Replying to @__michaelg
I sense that might be possible; had also thought about maybe doing something with the piezo buzzer and high/low tones? It’s not my area of expertise, but I’m sure it’s well within someone’s wheelhouse. This is why I’m super interested in getting hardware in people’s hands!
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Replying to @dothebart and @crowd_supply
I mean, the pads are pulled down by the microcontroller, and the metal bit is connected to the positive terminal of the battery, so pressing the button causes a rising edge, which registers as a button press? I may not be understanding the parameters of your question.
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Total side note: if you go to the Sensor Watch Crowd Supply page, click through on some of those product photos. They link to huge, gorgeous macro shots of the boards; easy to get lost in them. Also: shout out @MakeAugusta, who assembled these blue boards! https://www.crowdsupply.com/oddly-specific-objects/sensor-watch
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