snops

14 ms·

91.
by snops 8y ago
The big problem with using the raspberry pi in industrial applications is the single source and short production lifespan gauruntee (6 years [1]) making maintainance or long term production difficult. Industrial machines (e.g. printing pres
92.
by snops 8y ago
And those 6 pins are separate TX and RX pairs, and 2 grounds. The pins disconnected are 5V, which would potentially damage things or cause an overcurrent flag to trip (turning off both ports) if this was connected on both ends, and D+&#x2F
93.
by snops 8y ago
Laser safety is a well known issue, IEC60825 offers mathematical models to calculate the safety category (e.g class 1/2) of a laser device, which are based on physics models of the eye from first principles and empirical data. There is
94.
by snops 8y ago
The LIGO result is actually excitingly available as an IPython notebook, which provides a tutorial to verify the data yourself, using entirely open source software. https://www.gw-openscience.org/s/events/GW150914&
95.
by snops 8y ago
An alternative to this in python would be MyHDL: http://www.myhdl.org , which has a less verbose syntax and allows you to use the python scientific stack in testbenches. Spatial seems to have a HAL though (called the fringe), to
96.
by snops 8y ago
You are right that COCOM is not the issue, but there are other measures. The new military M code transmitted from the latest satellites is encrypted with a frequently changing key, so in the event of a war the DOD can disable the civilian s
97.
by snops 8y ago
I have previously seen Microsoft Embedded Learning Library[1] which requires LLVM support for the target arch IIRC, and uTensor[2] which runs TensorFlow models on larger ARM cortex micros. Nice to see another group in Microsoft is targeting
98.
by snops 8y ago
Apple taking the application processor business in house has gone very well, they currently have a substantial tech lead in the smart watch market due to their processor advantage over the outdated qualcomm most android devices are stuck wi
99.
by snops 8y ago
Moore's law will take care of the processing cost nicely, especially as more commodity processors become powerful enough to handle it. The ADCs and other analog stuff might be more of a hurdle, the design of them is quite hard, they ar
100.
by snops 8y ago
The electrodragon board is for cheaper single colour strips (hence the large MOSFETs on the PCB) while this is for individually addressable LEDs.
101.
by snops 8y ago
GDDR generally has higher latency than DDR in return for higher bandwidth. The reason is that the minimum read/write size is much higher, so the overhead of addressing is lowered. For graphics applications, this is a good tradeoff as t
102.
by snops 8y ago
For HDMI/DVI, there are a number of external transmitter ICs that take in 24 bit parallel video/I2S audio and spit out HDMI, e.g. http://www.analog.com/en/products/audio-video/hdmidvi-transm...
103.
by snops 8y ago
They don't just use chemicals, quite a lot of components are heated to a minimum of 110 centigrade as well, see https://marsmobile.jpl.nasa.gov/msl/mission/technology/insit...
104.
by snops 8y ago
The term you want to Google is "backscatter" I think. I reckon this might have been what you were looking for: https://www.washington.edu/news/2017/12/05/in-first-3-d-prin...
105.
by snops 8y ago
Not all phones support all the alternate modes of USB-C, especially display port or HDMI, so display output is often a hurdle.
106.
by snops 9y ago
A simple comb generator would fill all the frequencies nicely, and is very cheap compared to an SDR transmitter. I have no idea how useful the comb waveform is to "break" the RNG output though. Here is one for $99, I'm sure y
107.
by snops 9y ago
http://resin.io is close to this, but also handles updates for you.
108.
by snops 9y ago
All of those examples show large, high DPI (really thin fonts) colour touch screens, in non standard sizes. These are completely impractical from a cost perspective, requiring expensive tooling (>$100K) and easily $50 per screen (e.g. iP
109.
by snops 9y ago
Display port over USB-C should be this, the Samsung Galaxy S8 was the first to support it. Unfortunately, while quite a few docks are on the market, compatibility is a bit iffy, and rival USB-C alt modes like HDMI and MHL muddy the waters.
110.
by snops 9y ago
FYI, HDMI has an automotive connector (type E) as part of the specification, which is available from a range of manufacturers already and has a retention clip to avoid vibration issues.
111.
by snops 10y ago
Except the BeagleBone has PRUs, which are two 32 bit microcontrollers on the same silicon that can also access the GPIO peripherals. They share memory with the main processor but can be exclusively dedicated to your needs, and so peripheral
112.
by snops 11y ago
While at peak current, the efficiency of a voltage divider is the same as a linear regulator, at lower currents a voltage regulator has significant benefits. This is because the quiescent current used by an unloaded voltage regulator can b
113.
by snops 11y ago
A common metric in embedded is DMIPS/MHz. This is considered a bit antiquated (first written for the VAX!), but the Dhrystone benchmark is free and simple to implement. The important part is that its (supposedly) independent of clock s
114.
by snops 11y ago
It probably was, difficult to tell as it is extremely clean HTML, but the referencing seems to hint at bibtex (a referencing system for latex), with class names like "bibitem" and "biblabel". >and if so how How is eas
115.
by snops 11y ago
They are sandboxed "machine independent" binary blobs that chrome translates into the local architecture, see https://developer.chrome.com/native-client for details. Javascript isn't far off binary in terms o
116.
by snops 11y ago
I'm guessing its actually running on a ground station, providing commands or analysing data from satellites, hence why its non-critical and the need has arisen for parallel computation, presumably to speed it up. Many ARM embedded syst
117.
by snops 11y ago
Your going to need some pretty advanced manufacturing to be able to make these for the forseeable future. I certainly can't see it being cheaper than humans with AKs for a long while, especially in the kind of environment where your &q
118.
by snops 11y ago
>What I'm wondering is, will they eventually carry enough fuel to both be able to do an abort, and then do a powered landing, if required? Even if it could, its important to note that the abort system would only be used when somethi
119.
by snops 11y ago
> You could use (cleverly-braided+insulated) regular LEDs if there was a breadboard or something behind the map, but that'd be both huge and inconvenient. Theres a simpler solution that uses the same idea. Have pins that look like m
120.
by snops 11y ago
>Maybe one can run python on the network card rom too? The network card ROM isn't microcontroller code, its just x86 code that runs on your main processor, called by the BIOS[1]. You could potentially hence have the OPs project run

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