XAPBob
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Re: Cheapest ethernet/wifi based *anything* ??

Wed Mar 14, 2012 11:38 am

With Pi arrival day drawing closer I've been thinking about a number of things, but many of them require some sort of comms from a simple sensor/actuator.

Most of my house has Cat5, but many people won't

What's the cheapest (and lowest power if poss) simple comms device we can find?

It's disturbing that I keep returning to the Pi as the cheapest option - and it's too high power for many of my thoughts.

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meltwater
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Re: Cheapest ethernet/wifi based *anything* ??

Wed Mar 14, 2012 11:44 am

There a lots of chips which now have Ethernet built in if that is what you are looking for, probably a few of the PIC chips would do.

Is that what you mean?
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XAPBob
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Re: Cheapest ethernet/wifi based *anything* ??

Thu Mar 22, 2012 11:23 am

Yep...

Basically anything that can do ethernet and a handful of little things (i.e. trivial compute cf+ IP) with a GPIO or similar.

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rurwin
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Re: Cheapest ethernet/wifi based *anything* ??

Thu Mar 22, 2012 12:15 pm

XAPBob said:

It's disturbing that I keep returning to the Pi as the cheapest option
That's why millions of people want to get their hands on one -- They are a lot cheaper than the existing options.

Ethernet is quite expensive to implement, you could consider Zigbee, although I have no experience of it. It is designed for low power, low cost applications.

hippy
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Re: Cheapest ethernet/wifi based *anything* ??

Thu Mar 22, 2012 1:12 pm

XAPBob said:

What's the cheapest (and lowest power if poss) simple comms device we can find?
That would be some sub-$1 microcontroller linked to others via some sort of multi-drop serial network that perhaps also supplies power.

But what you actually need depends on what you want to do.

mcb1
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Re: Cheapest ethernet/wifi based *anything* ??

Fri Mar 23, 2012 10:44 pm

Not sure if this is what you're after, but offers one solution.

http://arduino-direct.com/suns.....#038;p=243

There's also these if you want wireless.

http://arduino-direct.com/suns.....#038;p=188

add a $4 328 chip and you have a lot of possibilities.

Mark

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rurwin
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Re: Cheapest ethernet/wifi based *anything* ??

Fri Mar 23, 2012 11:32 pm

Thanks to the BBC's coverage of the RaspPi, I came across this.

There's a couple of boards there, similar to the RaspPi but with enhanced networking and much reduced RAM.

The price is also similar to the RaspPi.

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Re: Cheapest ethernet/wifi based *anything* ??

Sat Mar 24, 2012 2:57 pm

XAPBob said:


What's the cheapest (and lowest power if poss) simple comms device we can find?



XBee? Failing that, there are some other lower powered stuff to take rs232 and transmit it wirelessly using the various license-free bands avalable. XBee is fairly low power, but you need power to transmit data over a distance and to bounce off walls, go through doors, etc.

And occasionally you get stuff like this:

http://www.ebuyer.com/290691-t.....-tl-mr3020

which you can re-flash with open-wrt... I really don't think you'll find a cheaper Wifi/Ethernet router than that right now (£11.13)

Gordon
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