As far as I understand it the micaz uses a simple CSMA, where it listens
for a radio signal above a "squelch" value just before transmitting. If
it hears anything it does a randomized backoff/retry.
For power voltage, I run on regulated 3.3v. I looked at the spec sheets
for the chips (actually the mica2 w/ CC1000) and it "seems" that 5v is OK,
but have not tried it. Let me know if you get smoke...
MS
Munaretto, Daniel wrote:
Dear all,
i would like to ask you some questions about CC2420 and micaz energy
consumption.
I read, from reports and data sheets, that the Basic RF library in CC2420
contains only a small subset of the 802.15.4 standard: beacons is not
implemented, no defined coordinator/device roles,
it does not check CCA twice , it does not retransmit packets, it cannot
communicate with other networks.
1)I would like to understand if, by default, any collision avoidance mechanism
is implemented or may be available for motes, as our micaz, which have this
chipcon (for example, in the CC2420 folder in TinyOS 1.x, is it implemented a
simple CSMA or a CSMA-CA?).
Because my research group needs to know if and how to provide a "good"
collision avoidance mechanism on our micaz motes.
2)Exactly, what are the bounds of "the limited ability of the user" on defining
the MAC layer by TinyOS code? i mean, what can i modify, if possible, in the MAC layer
and how/where?
3)I've just discovered that using the flash on our motes, so reading and
writing on flash, the batteries are insufficient. I was using 1.3 V rechargeble
batteries, but it seems i need more power.
Is it a known problem?is it possible to source the mote over 3V?because, it is
written 1.5 V on the motes...
Thanks for your availability, any further help will be really appreciated
cheers
Daniele Munaretto
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