Hi,
I there any example of time synchronization with multihop for tmote sky. I have
25 tmote sky systems connected to pressure sensors and I want to synchronize
the sampling of the sensors.
Thank you
Manu Suryavansh
-
Expecting? Get great news right away with
In December 2004 Robert Szewczyk posted to Tinyos-contrib-commit
instructions on how to use JTAG functionality through the USB connection of
a telosb (via the D2xx FTDI driver and some associated programs/dlls). This
is repeated in http://www.cs.utah.edu/~vchakra/msp430-jtag.html
The JTAG
Hello,
I have found some code in the sourceforge repository defining interfaces as:
Interface name_interfaceuint16_t
However, while I compile the code, I've errors with this interface. Is it
correct that definition? There's another way to define it?
Can TinyOS compiler accept that sintax.
Hi,
My tmote's worked until 1.8 V, but with this voltage temperature gives
strange values. ;)
Regarding to this topic, I'm working in reducing some power consumption,
Is there any way to know the actual consumption in mA of the tmote sky?
the idea is to check if implemented improvements
the buffer signaled by dataReady is always full of 0xfff
The problem is the reference voltage. You are, I guess, wiring to
Msp430Adc12ClientC, which does not use the reference voltage
generator. But your configuration requires the RefVolt generator to be
on (REFERENCE_VREFplus_AVss).
What
Thanks for reply :)
But I have one more question,
Looking through CC2420 datasheet we can see:
The length will be 8 bytes, RSSI will contain the average RSSI level during
receiving of the packet and FCS/corr contain information of FCS check result
and the correlation levels. Page 33
And on the
Hi,
I am currently working in a Role Assingment Algorythm on MicaZ Motes.
Therefor i would like to check at runtime, if there is a Sensorboard
connected to the Mote. I just need a function, that checks at bootup, if
the Sensorboard is there or not.
How do i do this?
MFG Martin
Ok, I've enough other stuff to look at so i'll wait for the multi
channel :)
Thanks again for your reply
regards
Jan Hauer wrote:
the buffer signaled by dataReady is always full of 0xfff
The problem is the reference voltage. You are, I guess, wiring to
Msp430Adc12ClientC, which does not
It's over the first 8 symbols. The built-in RSSI is always averaged over
8 symbol period (Page 49).
-Han
Aleksandr N. Sadkov :
Thanks for reply :)
But I have one more question,
Looking through CC2420 datasheet we can see:
The length will be 8 bytes, RSSI will contain the average RSSI level
* Wang, Lei (Ray):
Alexander Becher wrote:
* Yang Peng:
Does anyone use run -rf=yourlossyfile.nss nodeNUM ?
It seems like my lossy.nss file does not work, seems like it is not
read
You also have to specify -r=lossy.
could you give more instructions on how to use it in cc2420? we tried,
and
Hi Steve,
I've already seen this pdf with this power consumption graphic.
Nice to know how to do it, but for the moment, with my equipment I will
try to use voltage readings as a first reference.
Anyway I will try to search this equipment to best know the power
consumption of my software.
Jordi Vilaseca wrote:
Hello,
I have found some code in the sourceforge repository defining interfaces as:
Interface name_interfaceuint16_t
However, while I compile the code, I've errors with this interface. Is
it correct that definition? There's another way to define it?
Can TinyOS
Hi,
I've checked the related files, and they are all cvs-updated. And I
removed the ^M in the main.ihex and convert the file to UNIX format.
However, I still met this bad file format error. The weird thing is that
Blink can successfully programmed to the nodes, but it doesn't work for
Hi,
Data settings (default rate, position, ...) sent to motes don't correspond to
the data received when we request the same information from the sensor network.
Do anyone have an idea of the reason that can be behind this?
NB: All fields of our message are defined.
Ahmed Dehbi and Tony
I'm wondering to know if it is possible to measure the RSSI value whenever I
want, I mean, not necessary during the reception of a packet, but everytime,
for some reasons due to my specific applications...
thank you
On 6/19/07, Tsung-Han Lin [EMAIL PROTECTED] wrote:
It's over the first 8
... I mean, since before transmitting there are 2 different modes, based on
the measured cca value, I think it's possible to get the actual value of the
incoming signal power, even not during a reception. In that case which
command should I use to get the rssi?
On 6/19/07, roberto pagliari
TinyOS-2.0.1: Connect into the CC2420Control.ReadRssi interface (ReadRssi is
the Readuint16_t interface). Make sure your radio is on.
-David
_
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of roberto
pagliari
Sent: Tuesday, June 19, 2007 9:08 AM
To: Tsung-Han Lin
For a QD current measurement you can put a 1 ohm resistor
in line to the battery and measure the voltage drop across it.
This will give you milli-amps. Some brilliant person on this
list suggested soldering the resistor to both sides of a sliver
of PC board and sticking it between the battery and
On Jun 19, 2007, at 9:08 AM, roberto pagliari wrote:
I'm wondering to know if it is possible to measure the RSSI value
whenever I want, I mean, not necessary during the reception of a
packet, but everytime, for some reasons due to my specific
applications...
Yes:
thank you... since I'm using tinyos 1.x, with a modified version of the
cc2420, I'm going to check how to do that, maybe some function is defined
within hplcc2420.
I have a last question: when the radio turns from the receive mode to the
transmit mode, calling for example STXON, I assume every
Hi, Alexander,
I got the same point as you mentioned. Now we got a quick solution
by setting the topology coordination (in the source code) manually,
(of course we can read that information from an external file):
for example:
adcValues[0][128] = 0; // X for node 0
adcValues[0][129] = 0; //
Hey All,According to my findings in the
tinyos-1.x/tos/interfaces directory, and after reading the ADCControl
interface I have some doubts that I expect you can help me to make me
clear.I need to sample a microphone with a Sampling rate over
64Kbps, because I need to playback the audio samples,
Hello,
We have made a NesC application like surge, which can send and receive messages.
So before sending a message from our motes we filled every fields of our
message struct with :
*
It's easier for us to help you if you stop for a moment and try to list all
relevant information.
What have you installed and read so far? Have you gone through any of the
tutorials?
On Mon, June 18, 2007 3:40 pm, mai naaom said:
i wanna ask about the tuturials regarding the issue of using the
Hi all,
I have tried to put micaz cpu into deep sleep mode but still could not work. I
used HPLPowerManagementM module and did observer some current drop. But the
lowest current I got is just 1.2mA with 3V when everything is off (timer, led,
TX/RX). I wonder that can anyone show me how to make
hi all,
within RadioControlM I can see CC2420Control.RxMode(), but, after a packet
has been sent I cant find any call to CC2420.RxMode() or SXON oscillator.
where is it done?
the second question is: once the transmitter oscillator STXON has been
enabled, if an incoming message arrives, will it
The default mode for the radio is Rx mode - after it transmits a packet, it
automatically switches back to Rx on the hardware.
If you attempt to transmit using STXON without clear channel assessments,
then your radio will not only *not* receive the other transmitter's packet,
but it will cause
right, I just remembered that point in the cc2420 datasheet. I have a last
question: the transmission of a packet is performed if the RSSI value is
greater than a certain threshold, the CCA. The 3 CCA modes are
0 reserved
1 clear channel when received energy is below threshold
2 clear channel
Actually, you have an option to transmit without CCA. At the hardware
level, there are two command strobes to transmit the contents of the TXFIFO:
STXON and STXONCCA. If you simply toggle STXON instead of STXONCCA, then
your packet gets transmitted no matter who else is transmitting.
There
thank you David. I misunderstood the datasheet information regarding the CCA
modes. But it is possible, not during the transmission, to get the rssi
data, no matter if the node is receiving or not a message? I just need to
monitor the environment, but I'm not sure if in RxMode the receiver
Roberto -
Yes, you can obtain the environmental RSSI when you are not receiving a
message from the CC2420 radio.
However, the 1.x radio stack isn't setup to sample ambient RSSI. If you'd
like that functionality in 1.x, you'll need to develop it, and may use the
TinyOS 2.0.1 CC2420 radio
In TinyOS 1.x you can connect the interface HPLCC2420 to HPLCC2420C and use
call HPLCC2420.read(CC2420_RSSI);
to acquire ambient RSSI, make sure you check the RSSI_VALID register
before you read out the value.
To check that register you'll need to read the status byte, you can use
call
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