Oh sh*t
Cheap technology like this will only encourage the mould-like growth of the internet of tat. Can't we stop them now?
One of the favoured low-power radio techniques in Internet of Things research is “backscatter communications”: the transmitter sends a signal to a Thing, and the Thing modulates its data onto the reflection, and that's then decoded by a receiver. The problem with such a passive comms scheme is that its distance is limited to …
You missed the hint in the article that they are looking at agricultural applications. Technologies related to IoT have been in industry and farming for years - they save people time and money. If you're not aware of this, perhaps you should learn more before commenting?
More generally, weren't you ever taught to be wary of dogma?
2000 sqare ft homes are not uncommon in the States so uptake for this technology is likely to occur for domestic IoT at least as much as for market gardens. No matter what the target market is initially if there is money to be made from a technology it will be.
Perhaps you should gain a better understanding of market forces?
If you see IoT as an unwelcome inevitability - because it has so many existing applications - then surely it's more productive to steer it than to condemn it? Do you try in vain to dam a river, or do you channel it?
It seems that rather than saying 'I don't want insecure, data-leaking IoT' which is a reasonable position, you're saying 'No IoT for anyone, even if it might help them do their job'.
Market forces will lead to more IoT devices across a large range of sectors such as farming, industry, and healthcare. It is therefore sensible to discuss how to mitigate the downsides - insisting on better security, legislation about user data hoarding, insist that devices only communicate on your local network unless you explicitly give informed permission etc
There are many examples of connected items that pre date the IoT acronym, I was working on and trying to develop a market for water treatment equipment at, he turn of the century. For industry it is an important game changer and will become an essential part of industr if it isn't already but for the domestic markets, much of what is being touted is gimmicky crap that is often unnecessary as well as being almost criminally insecure.
I have no problem with genuinely useful IoT items but I do object to poorly designed and thought out rubbish being pushed onto a largely ignorant population.
I have yet to hear of any connected thing that will make me part with my money and not expecting anything soon.
Cricket pitches are tricky because they're variable in dimension. Only minima are specified by the Laws. I mean, which pitch do you use as the standard-bearer? Lord's? MCG? If we use a ballpark figure, say 1 1/4 ha, then about 1/3 of the pitch, though since these coverage areas are circular, you'll probably need four to properly cover the pitch.
Cricket pitches are tricky because they're variable in dimension. Only minima are specified by the Laws. I mean, which pitch do you use as the standard-bearer? Lord's? MCG? If we use a ballpark figure, say 1 1/4 ha, then about 1/3 of the pitch, though since these coverage areas are circular, you'll probably need four to properly cover the pitch.
If you're going to use a ballpark figure then there is only one to use: the original Yankee Stadium
Typical of the USians to come up with weird measurements which are meaningless in the rest of the world. I mean, who but a seriously rich capitalist bstard has a house that's 70ft square for heaven's sake?
And 'a one acre vegetable farm' FFS? One acre I can handle, but vegetable farm? Does the range depend on what sort of vegetable you grow? Better range with carrots than maize? Is it affected if you have a few pigs and chickens? Or could you have a cow and use the horns for a repeater transmitter? And does the soil type affect things? These questions must be answered. The point about standards is they are standard - a one acre vegetable farm is fine, provided they specify the type of crop and location.
Sheesh, colonials!
> And does the soil type affect things?
Soil gave John Deere his start. As farming moved West from the East coast, farmers encountered a thicker soil that clogged the iron ploughs that were commonly used. Deere developed a self-scouring steel plough, allowing more continuous ploughing.
Fast forward a century and a half to find controversy over DRM in John Deere tractors.
So, given that the typical un-powered RFID keyfobs I've seen work at a maximum of 10cm from the readers (and if you want a metre or so in come the square-foot-sized antennas) - is this technology putting out chocolate-melting radar-levels of power (and comparable dishes) on the TX side, or is it simply made of solid magic...?
Those key fobs are operating at much lower frequencies (125kHz or 13.57MHz against 868MHz), do not use any sort of intelligent modulation and are (as you say) entirely passive. Given that the article states: "small enough to use flexible electronics (including printed batteries)" that doesn't appear to be the case here, though given the quoted power figures I imagine the TX stage must be largely passive.
It is pretty clever but there a few things they are rather coy about.
1) This is not "printed electronics." They are saying that it could be powered by a printed battery. The encoder is way too complex to be printed, and will be a chip. No surprise there as a cutting edge printed transistor is about 50MHz max. No use for GHz RF comms.
2)That chip does not exist yet. They simulated it. Based on that sim they expect it to run on the battery they describe.
3) Yes the range is very impressive for the power (theoretically) required.
4)They had to reverse engineer the lowest level protocols. IOW either they pay a license fee over if Jeeva Technology (company some of them have formed to market it) goes further, or expect some legal grief in an East Texas court on IP/Patent/Copyright/Whatever else-we-can-stick-them-with from the proprietary protocol owners.
So still got a fairly complex mixed mode chip to get mfg and tested.
"4)They had to reverse engineer the lowest level protocols. IOW either they pay a license fee over if Jeeva Technology (company some of them have formed to market it) goes further, or expect some legal grief in an East Texas court on IP/Patent/Copyright/Whatever else-we-can-stick-them-with from the proprietary protocol owners."
OR they improved upon it enough to file for a derivative patent, allowing them to have a bargaining chip in a patent war.
Yes and no.
The system uses a "spread spectrum" system, like GPS. In GPS the received bandwidth (for the civilian signal) is 1.024MHz. The actual data stream is only 50 bps.
For this it's about 18bps, but again very wide radio bandwidth.
OTOH "The Thing" carried voice through mechanical FM of carrier in the 100s, or 1000s of MHz, so its bandwidth was about that of a low pass voice signal, 3-5KHz.
The trick (in theory) is you can interrogate lots of these IoT with different spreading codes (maybe).