Hi
1) From the TelosB node datasheet you get the minimum voltage level the node
shoud operate (let's say 2.1v). I'm assuming you do not have extra hw
connected, if so, add its requirements.
2) You could be using NiMH (rechargeable batteries) or AA alcaline
non-rechargeable batteries. The discharge curves (could give you an idea of how
much energy is in a battery for a voltage
value) and the cell voltage are different. Just give a try at Duracell site.
3) So assuming you are using AA alcaline, not using extra hw, asking to
susbtitute at 2.2 should be ok if you are not using too much the radio and do
not take to much time to substitute.
More than this, do some nice tests with a scope or the hard way :)
Regards,
André
----- Original Message -----
From: David Conde
To: 'Nicola Bressan'
Cc: [email protected]
Sent: Tuesday, October 27, 2009 10:40 AM
Subject: Re: [Tinyos-help] Battery Level for Telosb
No it is ok, you helped my telling me about the InternalVoltage component,
just I wondered if there is a relation between level battery to Voltage level
because I do not know if there is some relation between them? The problem is
that I am going to use it for critical systems which never can stop because of
battery off, for this reason I need something which warns me that battery is
going to be finished completly, before that the battery is actually OFF (0% of
its level).I would like to have something which warns me when the battery's
level is around 10% of its 100% level.
Thanks in advance and thank Nicola for your answer
Regards
David
De: Nicola Bressan [mailto:[email protected]]
Enviado el: martes, 27 de octubre de 2009 11:23
Para: David Conde
Asunto: Re: [Tinyos-help] Battery Level for Telosb
I'm sorry but I don't succeed in answering to your questions because I'm not
never me place the problem...
I don't have more experience about this... I have confined to effect a
periodic reading of the data....
Sorry if I don't help you....
Nicola
2009/10/27 David Conde <[email protected]>
Hi Nicola,
Thank you for your answer.
Do you mean that you use Msp430InternalVoltageC in order to get the level
battery?But what is the function which relates battery level to voltage level
from InternalVoltageC? For example, do you know what voltage from
InternalVoltageC is equivalent to 10 % of full battery? I read about use
InternalVoltage and people said that is not very reliable, because of level
battery usually falls down much more faster as Internal Voltage does, so from
your experience, do you usually use it in order to get a threshold for mínimum
battery level, don't you?What is the voltage do you use as mínimum battery
level?
Thank you in advance
David
De: Nicola Bressan [mailto:[email protected]]
Enviado el: martes, 27 de octubre de 2009 11:02
Para: David Conde
Asunto: Re: [Tinyos-help] Battery Level for Telosb
You can see the component Msp430InternalVoltageC(). I use this for read the
Voltage/Battery Level and I think that is the correct value becouse i see that,
when I use the battery the voltage is 2.5V but if I use the cable-USB the
voltage is 2.97V
Nicola
2009/10/27 David Conde <[email protected]>
Hi,
I have read some information in TinyOS-help about how getting battery level
from VoltageC components in Telosb, but I think there is not direct relation
between the Voltage Level in TElosb and Battery level, I am sure that someone
else has had the same need of getting the battery level in order to send an
alarm message so batteries in Telosb can be swicthed each time that they are
almost finish. How could I solve this problem?If there is no way to get the
battery level from Telosb, how can I work around about this?Does it exist any
sensor which can be integrated in Telosb to get the battery level as the same
way as a mobile phone does it?Does it exist any electronic circuit to get the
battery level?
I am working with TinyOS 1.x and Telosb motes
Thank you in advance
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