slewis

16 ms·

121.
by slewis 10y ago
Yes -137dBm sensitivity: http://www.semtech.com/wireless-rf/rf-transceivers/sx1272/ In the blog post we were using 27dBm transmissions. At that level the radio and power amplifier draw about 1.5W. If a transm
122.
by slewis 10y ago
Shawn from Beep here. Are you referring to LoRaWAN networks specifically? I'm always down to talk wireless schemes. Hit me up (email in my profile). We go beyond LoRaWAN with our own protocol for some use cases. For those following alo
123.
by slewis 10y ago
Shawn from Beep here. We use the 902-928MHz band in the US.
124.
by slewis 10y ago
Try Redis: https://github.com/antirez/redis Or Lua: https://github.com/LuaDist/lua
125.
Messy Networks for the Internet of Things(blog.beepnetworks.com)
36 points by slewis 10y ago|4 comments
126.
The Internet of Things is looking for its VisiCalc(medium.com)
6 points by slewis 10y ago|0 comments
127.
Testing new IoT wireless network range in San Francisco (Spoiler: 1-2 miles)(medium.com)
2 points by slewis 10y ago|0 comments
128.
by slewis 10y ago
The DAC in the iPhone is as good as any external DAC you can buy, when it comes to human perceivable sound quality. Any other claims are audiophile BS and placebo. There are valid product reasons for moving away from the 3.5mm jack though,
129.
Olympic medals per capita(medalspercapita.com)
70 points by slewis 10y ago|74 comments
130.
by slewis 10y ago
There was one on Mission St in San Francisco until last year. Expensive but worked in a pinch for basics (through-hole capacitor kits for example).
131.
by slewis 10y ago
Thanks. I'd poked through the howitworks. What threw me off was the reference to Etherpad, which made me think apps could somehow run on SandStorm unmodified. Makes sense now!
132.
by slewis 10y ago
Can you explain the "Fine-grained Object Containers" concept a little more? For example, how is this enforced: "JavaScript running in the user’s browser can talk only to the document container for which it was loaded, no othe
133.
by slewis 11y ago
Couldn't browsers keep a map of js-file-hash to cached AST?
134.
by slewis 11y ago
You have the correct mental model, but does the next person who modifies your code?
135.
The battery startup that promised GM a 200-mile electric car (2013)(qz.com)
1 points by slewis 11y ago|0 comments
136.
by slewis 11y ago
That's not what I said. I took issue with tptacek's statement that there was only one bug.
137.
by slewis 11y ago
Everyone is either saying go to a big corp or go to a startup as your first job. What I usually tell new grads is: Get offers from both, and take the job that has the best potential person or people that you'll be able to learn from. T
138.
by slewis 11y ago
Why wouldn't it be considered a bug that accessing one low-permission S3 bucket allowed him to access all the other buckets, including user data and keys?
139.
by slewis 11y ago
Counter argument. Usability does not have to be number one. There are lots of programming languages out there. What if one had a unique take on a website? It's healthy for people to try new takes on things. I laud the approach. I think
140.
by slewis 11y ago
I haven't seen anything using MIMO yet. Not sure how that would affect power usage. The closest thing now is that a key aspect of Ingenu's solution is receive diversity. All of their client radios require two antennas.
141.
by slewis 11y ago
You can amplify a signal and send it far. But due to FCC regulation in the 900MHz band for example you can only instantaneously transmit at 30W. Another way to make a signal go further is to transmit at a lower data rate (thus spreading you
142.
by slewis 11y ago
Check out my response to your other comment.
143.
by slewis 11y ago
https://www.lora-alliance.org/portals/0/specs/LoRaWAN%20Spec... Would love to hear thoughts on it. Email address in my profile.
144.
by slewis 11y ago
Great question. It depends on the technology. For example with LoRa, in the US there are 64 usable channels. In addition there are 5 available "spreading factors" per channel that are orthogonal to each other. A lower spreading fa
145.
by slewis 11y ago
Shawn from BeepNetworks here. Check out OnRamp (now Ingenu). Their coding scheme allows 1600 simultaneously communicating devices per spread factor per channel. That 1600 factor means their base station can handle massive numbers of clients
146.
How New Long-Range Radios Will Change the Internet of Things(medium.com)
186 points by slewis 11y ago|108 comments
147.
Sleep study on modern-day hunter-gatherers dispels notion that we need 8 hours(washingtonpost.com)
9 points by slewis 11y ago|4 comments
148.
This Genius App Will Find Your Perfect Foundation Shade with Your Selfie(allure.com)
2 points by slewis 11y ago|0 comments
149.
by slewis 11y ago
Yeah, I think a lot of English teachers push on over-interpreting, which drives some set of students away. It's unfortunate because there is actually a lot of beauty to be found in literature, and each reader is free to find his or her
150.
Fun with Software-Defined Radios: Mapping the Spectrum in the Mission, SF(medium.com)
67 points by slewis 11y ago|14 comments

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