there must be somebody knows, I've read about LPL many times but it did not answer my questions Hi everybody I've used LPL interface. but there is a point I just need to be sure about if you please. with using Timer.startPeriodic(5000); LowPowerListening.setLocalSleepInterval(1000); I take sample of the voltage and compare it with a threshold value, if it exceed this threshold it will send a message and if it lower than this threshold it will send another different msg. my question: when the mote TX (send ) if the RF is sleeping, wil it wake up automatically. when the mote RX (Receive) and the RF is sleeping, it will not wake up automatically but it will wait for the sleeping period to finish and wake up for 1000 to see if there something in the air ! right ? 2nd. thing Sorry for late because i was looking for the user guide the User guide for MSP430XX http://focus.ti.com/lit/ug/slau056g/slau056g.pdf described the SVS The supply voltage supervisor (SVS) is used to monitor the AVCC supply voltage or an external voltage. The SVS can be configured to set a flag or generate a POR reset when the supply voltage or external voltage drops below a user-selected threshold. The SVS features include: AVCC monitoring Selectable generation of POR Output of SVS comparator accessible by software Low-voltage condition latched and accessible by software 14 selectable threshold levels External channel to monitor external voltage SVS Operation The SVS detects if the AVCC voltage drops below a selectable level. It can be configured to provide a POR or set a flag, when a low-voltage condition occurs. The SVS is disabled after a POR to conserve current consumption concerning my question about using an external DC voltage source and the mote stop responding if the voltage is lower than 2V. can I configure this value in my mote to change the lower value ? Thanks & Have a Nice Day Mohamed --- On Tue, 3/31/09, Janos Sallai <[email protected]> wrote: From: Janos Sallai <[email protected]> Subject: Re: [Tinyos-help] Voltage Supervisor To: "Mohamed H. Seddik" <[email protected]>, "tinyos forum" <[email protected]> Date: Tuesday, March 31, 2009, 6:06 PM The mote will not work if the voltage is that low. Notice, however, that the voltage of the battery is not decreasing linearly with time when the battery is discharging. ( See charts for low current draws at http://www.powerstream.com/AA-tests.htm ) > the mote will work from 3.3 - 2 v and then will be shutdown, and can not use > the > rest 2 V ??? The unit of energy is not Volt. It's Watt. Trying to answer your question: If the battery voltage drops below 2V, the mote can't use the remaining battery power. > Can I change this by using for example modifying voltage supervisor ? How can > be done for IRIS mote? What voltage supervisor are you referring to? > I've tried to measure the drawn current using DC source and AVOmeter (the > all devices DC source + mote + AVO are serial connection) but I could not > get any result. the mote does not turn on ? You must be doing something wrong. Search the list archive on how to measure current draw. Janos
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