Working on a test setup for LED parameter extraction over temperature. I'm using a peltier element to heat/cool a block of aluminum that the LED is mounted to. The LED is powered using a fixed 10mA supply. The most important bits are probably the change in peak intensity (which correlates to lower efficiency), and the Vf drop. I need to work out a faster way to measure IV curves so that I can measure higher currents without adding too much self-heating.
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Matt Mets
@cibomahto@social.v.st
Principle instigator at Blinkinlabs. Based in Amsterdam, NL
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Joined November 15, 2022
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Also a small warning: If you keep your phone in a case, the battery can swell without it being immediately obvious. I only noticed this when the battery life also became poor
Yes, I would like to delete my linked Signal message history on my laptop and only get 45 days of it back when I reconnect this device, because my phone battery is swollen and I needed to switch to a temporary one while getting it fixed.
I made a breakout board for TI's tinly LM36011 LED driver. It's designed for cell phone camera LEDs, and features an I2C controlled current source to power the LED ('torch mode'), as well as a short duration 'flash mode', that can bump the current up to 1.5A. Paired with a nice power LED it can put out a lot of high quality light from not much space.
Replying to
@cibomahto@social.v.st
@JamesAkers@expressional.social My previous attempt to do this kind of layout-first approach was purely code based: https://circuitpainter.blinkinlabs.com/ . I'd like to make the gui tool more flexible by allowing custom code to be inserted, for instance if you wanted to use it to lay out something weirder like lights with sensors interspersed into them, or something.
Replying to
@JamesAkers@expressional.social
@JamesAkers@expressional.social I'm trying to make a companion tool specifically for LED layout, that also works backwards and generates a good-enough schematic so that you can integrate the graphically designed bits with whatever other circuitry you want on the board, to try to get the best of both worlds.
Replying to
@JamesAkers@expressional.social
@JamesAkers@expressional.social The big ones all have a similar workflow in this respect, unfortunately
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@JamesAkers@expressional.social
@JamesAkers@expressional.social is there an EDA tool that you like better?
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@th@social.v.st
@th@social.v.st If you launch spotify in the forest but don't have a connection, does it still make a sound?
Replying to
@phooky@hexa.club
@phooky@hexa.club @JamesAkers@expressional.social Surprise! This is raw 20V for your lighting! At least they didn't put it on the AC side.
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@cibomahto@social.v.st
Oh closer inspection, we don't have an H. Allway on our employee roster, and they appear to have stolen the package because it is not actually here.
Yes I would like to sign over Power of Attourney rights to FedEx so that we can comply with the CBAM for the import of €1.80 worth of screws made of iron
Still quite happy with our SolderPaster, it takes all the frustrating work out of getting solder paste onto small boards. The stencil for this one could have been a bit wider, but everything works as expected.
...and this corner of the screen is reserved for firefox and thunderbird update notifications, which display themselves continuously and persistently
Anyone want to see SUNN O))) with me next month in Amsterdam? I have a product that I need to run through vibration compliance testing. (I joke but they are actually playing)
Tried ordering some parts from Farnell, but one of the items apparently went out of stock between the time I placed the order and the time they packed it. They placed the item on backorder without notifying me, and double charged my credit card for the items that were in stock.
It's great to have choices in computing- when I want an ad-free desktop experience, I use Linux. When I want copy and paste to work reliably, I use Windows. When I want to use a computer cursed with a T2 security chip, I use macOS.
Replying to
@cibomahto@social.v.st
Produced a RevB of the board with nice squiggly lines, but the real issue turned out to be an excessive capacitor filter on the TX and RX clock lines. Removing that, even the RevA boards perform as expected.
Guessing your repo URL because github/lab aggressively logged out your browser session and logging back into that with 2fa is too much work, but your SSH key never expires.
Really appreciating @jellyfin@mastodon.online 's built-in 'cast to device' feature. We're using it to remotely control music playback on a computer connected to our sound system, with no extra weird steps or configuration required.
Replying to
@23n27@dgc.social
@23n27@dgc.social I just corrected the link- i'm using the fast version as well.
Still really happy with the USB-SD-MUX. If you do any development where you are booting from SD cards, it fully automates the reflash/reboot cycle. https://linux-automation.com/en/products/usb-sd-mux-fast.html
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@cibomahto@social.v.st
With a small bit of rework, the PHY solidly negotiates a gigabit connection. Unfortunately this shows that the rgmii bus traces aren't matched well enough for 125MHz ddr- the best clock delay I could find resulted in a 75% packet loss at 1000Mbps, but if i force the connection to 100Mbps then runs flawlessly.
That's all that is needed from this board rev, the goal was to verify basic functionality before spending time tuning things.
Replying to
@th@social.v.st
@th You might like the new saleae logic analyzer probes. They use USB C connectors for the data signals, but negotiate alt-mode to protect themselves/others from accidental misconnection
The author should really acknowledge TS Elliot's prior contributions [1] to this subject
Back at the golang art-net receiver project. Interestingly, on the actual, lower-end hardware, the go-based receiver measures less jitter than on an RPi 4 or Intel laptop. Maybe this is because it's running on a stripped down buildroot environment?
Sig-Net is a new stage lighting protocol designed with the intent of being secure enough to be compatible with the CRA: https://sig-net.net/ The spec is supposed to be released in a few weeks, but they have some intro videos available now.
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@osmocom@fosstodon.org
@osmocom@fosstodon.org @artelse@mastodon.social Yeah, no complaints after this investigation.
Replying to
@azonenberg@ioc.exchange
@azonenberg@ioc.exchange @artelse@mastodon.social They use a semi specialized process to make the "digital isolators". My guess is that this tech isn't compatible with whatever tech they need for the RS485 driver- it does need to withstand higher voltages/common mode than typical io ports, but isn't really exotic. https://www.ti.com/video/6138482845001
X-rayed an isolated RS-485 transciever (
TI ISOW1412) with @artelse@mastodon.social . The chip appears to have 5 separate dies + a (ceramic?) transformer mounted onto the metal leadframe. That's a lot going on in such a small package.