The CC2420 has some range, and while 40 feet is good for a CC2420 on the ground, it isn't a whole lot when you compare it to other radios. With lower and lower frequencies, you can transmit much farther. 2.4 GHz gets eaten by the ground. A CC1000 radio has the potential to get about 400-600 feet on the ground, and possibly further.
With a CC1100 radio, I'm able to reach 750 feet with nodes placed directly on grass, using wire antennas and 500 kbps. Lower that 500 kbps throughput and the range is extended even more. This kind of range is physically impossible for a CC2420 radio, while being more energy efficient. I like the CC2420 for improving ad-hoc networks and research, but it's time to move on to better radios. -David On Tue, 15 Apr 2008 00:09:02 -0400 "Eric Keller" <[EMAIL PROTECTED]> wrote: > That was an interesting page, but I'll disagree about >the range of the CC2420, > I'm getting over 40 feet of range, and my motes are >actually buried in > the floor. > I'm pretty sure that doesn't help their range. > Eric > > On Mon, Apr 14, 2008 at 9:28 PM, David Moss ><[EMAIL PROTECTED]> wrote: > >> If you're thinking about rolling your own hardware, you >>should really be >> using CC1100 or CC2500 radios for any wireless >>application that doesn't >> require 802.15.4 compatibility: >> http://docs.tinyos.net/index.php/CC1100/CC2500 >> >> >> >> -David >> >> >> >> >> >> >> >> >> >> >> >> ________________________________ >> >> >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On >>Behalf Of Edgar >> Charry >> Sent: Monday, April 14, 2008 3:57 PM >> To: [EMAIL PROTECTED]; Eric Keller >> Cc: tinyos-help@millennium.berkeley.edu >> >> >> Subject: Re: [Tinyos-help] Pumping up bandwidth - >>Mica2Dot/Mica2 >> >> >> >> >> >> Hi all, >> >> Thanks for your prompt replies. Unfortunately I that >>link didn't let me >> through. >> >> In fact I am still trying to undestand them, as I >>wasn't aware of that >> limitation of 33-50ms of the Mica2's! You are saying >>that the maximum >> bandwidth my app should require is 0-25Hz so that I have >>a nice >> reconstruction of my wave, due to HW limitations? >> I knew that the CC1000 has a maximum bandwidth of >>76.8kbps and of course >> due to EEPROM readings/writings, CPU instructions, ADC's >>measurements etc. >> this number should decrease. But I wasn't expecting a >>final bandwidth of >> 30pckts/s!!! In fact, I thought there were problems >>related to the TOSBase. >> My app requirement need at least 100Hz (Mica2's >>transmission needed thus >> 200 pckts/s), which is necessary to track a complete >>gait cycle using acc >> and gyros with good definition. >> >> What is the most critical factor in the Mica2's that >>blow the transmission >> rate so bad? Does this happen with the Mica2Dot too? >>Data compression >> (sample with a higher freq, store in the RAM and then >>send the whole bunch >> of bytes) has a limitation of 29 bytes due to TinyOS, >>correct? >> >> Thanks guys for the good info. >> Cheers, >> Edgar Charry >> >> > Date: Mon, 14 Apr 2008 12:20:38 -0600 >> > From: [EMAIL PROTECTED] >> > To: [EMAIL PROTECTED] >> > CC: tinyos-help@millennium.berkeley.edu >> > Subject: Re: [Tinyos-help] Pumping up bandwidth - >>Mica2Dot/Mica2 >> > >> > Well, since people are quoting my second source >>messages, have a look at: >> > http://www.etantdonnes.com/Motes/report_mica2/ >> > (which seems to be down right now but will hopefully >>be back soon...). >> > >> > However my message speed/reliability measurements use >>only the standard >> > GenericComm and TOS1 code. I think the OP was trying >>to fiddle timeouts >> > and backoffs to speed things up further. Data mining >>of the help list >> > should turn up some more useful advice in this >>respect. >> > >> > MS >> > >> > Eric Keller wrote: >> > > There is a limit to how many packets you can send >>with a mica2 which >> you are >> > > at or above. You probably want to lower your >>bandwidth requirements >> somehow. >> > > See this message: >> > > >> https://www.millennium.berkeley.edu/pipermail/tinyos-help/2008-April/032464.html >> > > >> > > Eric >> > > >> > > >> > > On Mon, Apr 14, 2008 at 4:59 AM, Edgar Charry >><[EMAIL PROTECTED]> >> wrote: >> > >> Hi all, >> > >> >> > >> I am trying to pump my packet transmission up >>between a Mica2Dot and a >> > >> Mica2 to at least 200Hz [pckts/s]. >> > >> >> > >> I've decreased the timer constant to a bottleneck >>of 33ms (30 pckts/s) >> that >> > >> pratically executes a round of ADC measurements >>and send the packet. >> > >> Decreasing from this point doesn't give me more >>bandwidth. However, my >> > >> packet is 14bytes long (the TinyOS header + just a >>couple of adc >> > >> measurements + CRC). >> > >> >> > >> I suspect that this 33ms (parsed time stamps from >>XSniffer) are >> limited to >> > >> the TOSBase.nc on the Mica2. I suspect that the >>PLL of the Mica2 is >> > >> listening through channels and is not locked to >>the transmitter's one. >> Every >> > >> loop thus should take 33ms. >> > >> >> > >> Actually, I haven't been through the CC1000 >>conf/mod components >> though, but >> > >> I reckon with your experience this can be solved >>easily. >> > >> Cheers, >> > >> Edgar Charry >> > >> >> > >> ________________________________ >> > >> Explore the seven wonders of the world Learn more! >> > >> _______________________________________________ >> > >> Tinyos-help mailing list >> > >> Tinyos-help@millennium.berkeley.edu >> > >> >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > >> >> > > _______________________________________________ >> > > Tinyos-help mailing list >> > > Tinyos-help@millennium.berkeley.edu >> > > >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > >> > -- >> > Platform: WinXP/Cygwin >> > TinyOS version: 1.x, Boomerang >> > Programmer: MIB510 >> > Device(s): Mica2, MicaZ, Tmote >> > Sensor board: homebrew >> > >> > _______________________________________________ >> > Tinyos-help mailing list >> > Tinyos-help@millennium.berkeley.edu >> > >>https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> >> ________________________________ >> >> >> Explore the seven wonders of the world Learn more! > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
