[Tinyos-help] [reduce power]

[Munaretto, Daniele]

Hi all,

I would say from my experiments that if u change from 3 to 1, you get a
significant difference of TX power..
Cheers
Daniele

 
 
Daniele Munaretto
Researcher
 
DoCoMo Communications Laboratories Europe GmbH
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-----Original Message-----
From: tinyos-help-bounces at Millennium.Berkeley.EDU
[mailto:tinyos-help-bounces at Millennium.Berkeley.EDU] On Behalf Of Urs
Hunkeler
Sent: Monday, July 16, 2007 4:12 PM
To: vazoumana fofana
Cc: tinyos-help at Millennium.Berkeley.EDU
Subject: Re: [Tinyos-help] [reduce power]

Hi,

Have a look at the CC2420 data-sheet at http://www.ti.com/lit/gpn/cc2420
(page 51). Actually the CC2420 only supports 8 discreet values for the
TX power. A value of 3 or below (including 1) would correspond to the
lowest TX power of -25 dBm.

Cheers,
Urs


vazoumana fofana schrieb:
> Hello,
> 
> i ve succeded in reducing power. I ve got a precision to ask : what s
> the meaning of the value 1. Which unit does it correpond ?
> 
>> From: Urs Hunkeler <uhu at gmx.ch>
>> To: vazoumana fofana <zoumlander at hotmail.com>, 
>> tinyos-help at Millennium.Berkeley.EDU
>> Subject: Re: [Tinyos-help] [reduce power]
>> Date: Fri, 13 Jul 2007 16:13:47 +0200
>>
>> Hi,
>>
>> This is what I previously wrote about reducing TX power:
>>
>> In Tinyos 2 with a platform with the cc2420 (such as MicaZ and the
>> Tmotes), you can use either a flag in the makefile:
>>
>> CFLAGS += "-DCC2420_DEF_RFPOWER=1"
>>
>> or you can dynamically change the tx power at runtime (individually for
>> every packet) with something like (wire in the CC2420PacketC module):
>>
>> call CC2420Packet.setPower(&rpacket, 1);
>>
>> You'll have to issue that call for every packet prior to sending it.
>>
>> Reducing the TX power to its minimum I get a maximum transmission range
>> of roughly 3 meters under ideal conditions.
>>
>> Cheers,
>> Urs
>>
>>
>> vazoumana fofana schrieb:
>> > Hello
>> > *
>> > I ve seen mails exchanged about this field but  i lost it.
>> > Does somebpdy how i can  reduce power transmission on telos mote under
>> > tinyos 2.x.
>> > I want to experiment multi hop network so i need to reduce trhe
>> range of
>> > each mote.
>> >
>> > Thanks for any help.
> 
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