fest

40 ms·

361.
by fest 10y ago
MODBUS over TCP is nice and good, but I'm worried that many people will soon start using it to communicate data with web-based monitoring platforms and will do it in plaintext. The current generation of PLCs are severely limited in the
362.
by fest 10y ago
I am missing something: doesn't a typical duplex ultrasonography machine already output blood flow rate? I recently had such a test and I vaguely recall seeing flow rate in the UI of machine. Oh, maybe the machine measures blood veloci
363.
by fest 10y ago
I own Chuwi Hi10 Plus with soft keyboard/case. It's a decent general purpose tablet but I wouldn't use it for work unless I had no other option. Reasons: * keyboard is too small for me (I find T430s keyboard much more co
364.
by fest 10y ago
I was surprised to see that ECG test results are still analyzed/summarized manually[0]. I have seen ECG machines at hospitals try to summarize the test automatically but doctors don't seem to trust them and still manually analyze
365.
by fest 10y ago
The general trend for embedded devices is in the direction of richer ways of user interaction. That usually involves adding touchscreen LCD. Once you add LCD, you want nice graphics, animations etc. While you can use microcontrollers for lo
366.
by fest 10y ago
Yeah, there are a bunch of crappy "let's see how much we can pack into this for under $20" smartwatches coming from companies in SZ. Most have terrible UI, terrible battery life nad terrible apps on phone side. However I thin
367.
by fest 10y ago
It can be even worse than I suspected. Turns out, even your mouse dongle can be used to inject keystrokes: https://media.defcon.org/DEF%20CON%2024/DEF%20CON%2024%20pre...
368.
by fest 10y ago
In my experience, Bluetooth audio devices have been the most stable. SPP (serial port) on the other hand has never worked reliably for me. I mean, I have seen it work. I just never take it as granted that it will work, and thus far have not
369.
by fest 10y ago
There are Chinese companies working on similar products, for example WeLoop[0], Goclever[1]. People are already working on open-source firmware for some of these watches[2], so I think there's a reasonably good chance that either some
370.
by fest 10y ago
Few questions to the team: 1) Is the screen latency numbers applicable to full-page updates also? I.e. scrolling a page of text. 2) How decent is the performance when dealing with large PDFs? 3) Is the digitizer pressure sensitive? Does it
371.
by fest 10y ago
When I looked for a small ANN library with little external dependencies and which could be statically linked I settled on FANN[0]. Worked reasonably, solved my problem as well as I hoped it would. It is rather limited in features though- no
372.
by fest 10y ago
Not really interested in details, just had a similar experience with optical flow implementation and wanted to know if mocap was better ;)
373.
by fest 10y ago
Did you have any issues with PX4 interpreting and fusing MOCAP data?
374.
by fest 10y ago
Great project! When listening to an interview with Alan Yates[0] (main designer of the Lighthouse) I was thinking about an application like this. I recently did shop around for motion capture system (cameras tracking markers) and one of the
375.
by fest 10y ago
I'm glad they list the limits clearly. Other e-mail services have similar limits by nature but you only find out when you hit them.
376.
by fest 10y ago
They probably have. A large problem in sensor fusion is: you don't always know which sensor you can trust. For example, in this case it probably would have helped to reject IMU and rely on doppler radar altimeter. But what if it's
377.
by fest 10y ago
I've worked on sensor fusion systems and I fully agree. Replaying the sensor inputs and evaluating new estimated state is a really good way of debugging failures (because you can't just stop the system mid-air and evaluate interna
378.
by fest 10y ago
IMO it's more likely that accelerometer instead of gyroscope would saturate, and the sentence that explains IMU is shortened too much.
379.
by fest 10y ago
While it may sound that the failure was caused by a rookie mistake- I'm sure the on-board systems were designed and developed by people who know what they are doing. It must be hard for all the people involved in Schiaparelli developme
380.
by fest 10y ago
Dynamic vision sensor is a novel type of imaging sensor. "Regular" image sensors output a 2D image where each pixel encodes light intensity. Dynamic vision sensor outputs pixel-level changes in the scene. For dynamic applications
381.
by fest 10y ago
I just did a cursory search for options to backup google account. The most comprehensive option seems to be https://takeout.google.com/settings/takeout , which offers to save data from almost all google services to a do
382.
by fest 10y ago
Can you access Nearline (Google Cloud product) when your google account is suspended?
383.
by fest 10y ago
On a slightly related note: does anyone have recommendations for embedded PC distributor/manufacturer in EU with online order system? I don't want to waste time talking to sales reps. From time to time I need a PC to stuff inside
384.
by fest 10y ago
Qualcomm platform has different camera and is directly connected to SoC, so I doubt they share anything with PX4Flow. PX4Flow can calculate velocity when camera-to-surface distance varies, no doubt about it. The problem is when single frame
385.
by fest 10y ago
Sorry, I don't think I can give you a lot of details. Let's say that one of my previous employers did a project which was supposed to be indoor quadcopter for consumers. Regarding PX4- completely agree. People working on it defini
386.
by fest 10y ago
The best (feature-wise) open-source quadcopter platforms are: * PX4, * ArduCopter (actually uses parts of PX4), * PaparazziUAV. These pack a lot of functionality: really advanced sensor fusion algorithms, position hold, waypoint&
387.
by fest 10y ago
IIRC, the arc voltage was proportional to height only at constant velocity. I guess it was also a function of how much material is below the arc at the instant. I was working on a controller which was supposed to get it's setpoint by m
388.
Darpa Helps Paralyzed Man Feel Again Using a Brain-Controlled Robotic Arm(darpa.mil)
3 points by fest 10y ago|0 comments
389.
by fest 10y ago
I helped with building CNC plasma cutter as well: http://www.boot.lv/forums/index.php?/topic/133809-cnc-plazma... (beware of the latvian language but has nice pics). How did you solve the torch height control
390.
by fest 10y ago
There is a saying in electronics engineering world: "Every sensor is also a temperature sensor." What this means is: almost every electronic sensor is affected by it's temperature- from expensive image sensors to cheap MEMS a

More ›