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September 13, 2007
News - In Your Lifetime
about 4 years ago
* Now remember most of the problems don’t come from the technology side, but from society. Think about the many movies (true or not doesn’t matter here) where the traffic lights are easily hacked and put a city under chaos… Do you think most people will trust their cars being driven outside their control? It may eventually happen, but not sure how long that will take to be acceptable compromise of risk/benefit for the masses. I wouldn’t bet that will be in my lifetime.
* As of Moore’s law, I am with you in the interest of reducing the pace at which gadgets are getting obsolete by a more reusable world. I do think the Moore’s law physical limits won’t be a big factor on that though: I dream about a society where everyone realizes the pollution, energy and actual cost of our current use'n'trash culture leads us. If we would ever have to pay for the actual impact on earth of our latest $5 USB gadget, we would not be trashing items as the speed we do. Moore’s law may not be a short term limitation if quantum physics, photons physics and other technologies goes beyond what semiconductors can do today, but earth resources are bounded and probably hitting us way earlier than we think…
about 5 years ago
Direct LOS you can get 500-800m with ease on low bit rate, assuming you really implement error detection to discard wrong packets. Using directional antenna you can go up to 2km LOS.
about 5 years ago
That is incorrect.
This is a silabs chip Si4421. See more info at www.silabs.com
“RF link” are very basic ASK modules, which are very sensitive to noise and fixed to one single frequency.
These new RF modules are FSK with frequency hopping capabilites, they really play in a different league, much more powerful and robust modules than ASK ones.
The RFM12 needs a lot of work to be used as a simple link. Go to RFM22 which has a lot of intelligence and a larger buffer inside, it makes transparent communication much easier.
on the other hand, RFM12 is much better to develop really custom radio links but for that you need non trivial work on the MCU side.
In my experience chipcon (now TI) CC10xx chips are much harder to configure / tune and expensive than Sylabs chip.
On the other hand, TI has better software support and more app notes, etc, available.
That is correct. The Sylabs chip embedded can deal with full band, but the tuning circuit is separated in 4 different frequency bands, I am not sure why Sparkfun describe it as full band support.
You may want to correct “Analog and digital signal strength indicator” as they don’t offer Analog RSSI actually. They say so in the datasheet but is incorrect, you will see no output pin exist for analog RSSI. Digital RSSI (actually thresold signal no actual value read) is available from SPI interface though.
about 6 years ago
Hi, what is the resistor value of the joystick? I would assume something in the range of 1k-5k, can you specify that please?
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