tag:blogger.com,1999:blog-969527591696668103.post8941791632960227359..comments2022-03-24T15:31:15.173-07:00Comments on Wireless Sensor Networks or "Look Ma no wire!": Power supply for remote sensorsMarkushttp://www.blogger.com/profile/12319820154420835740noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-969527591696668103.post-70054683644794104502014-04-09T06:09:24.431-07:002014-04-09T06:09:24.431-07:00It does - immensely. Thank you. I was curious ab...It does - immensely. Thank you. I was curious about pin13, as the documentation mentions it briefly but provides little other detail. Matthttps://www.blogger.com/profile/14743399618698575278noreply@blogger.comtag:blogger.com,1999:blog-969527591696668103.post-5892127636593771452014-04-09T01:31:46.248-07:002014-04-09T01:31:46.248-07:00Hi Matt,
I just posted the wiring of the temperat...Hi Matt,<br /><br />I just posted the wiring of the temperature sensor <br /><br />http://lookmanowire.blogspot.de/2014/04/xbee-remote-temperature-sensor.html<br /><br />Hope that helps<br /><br />MarkusMarkushttps://www.blogger.com/profile/12319820154420835740noreply@blogger.comtag:blogger.com,1999:blog-969527591696668103.post-27943242951205317632014-04-08T12:32:18.123-07:002014-04-08T12:32:18.123-07:00Thank you for the reply. I never saw a diagram po...Thank you for the reply. I never saw a diagram posted of your remote sender. I suspect it's a pretty easy circuit, but I'd still be interested in seeing something if you have it. <br /><br />In particular, I'm curious if you using the same temp sensor that you used for the base station, or something like the TMP36. I'm also interested in how the sensor is powered.Matthttps://www.blogger.com/profile/14743399618698575278noreply@blogger.comtag:blogger.com,1999:blog-969527591696668103.post-55199226503266614512014-04-08T09:14:58.343-07:002014-04-08T09:14:58.343-07:00Hi Matt,
the temperature sensor is only powered w...Hi Matt,<br /><br />the temperature sensor is only powered when the XBee is awake. It's tied to an analog Input and it's sampled only then and send to the host.<br />The only thing which consumes current is while the XBee is sleeping is the voltage regulator that only needs about 1µA quiescent current.<br /><br />Markus Markushttps://www.blogger.com/profile/12319820154420835740noreply@blogger.comtag:blogger.com,1999:blog-969527591696668103.post-73940743876349007912014-04-08T08:44:10.564-07:002014-04-08T08:44:10.564-07:00Hello Markus,
I'm building an outdoor sensor ...Hello Markus,<br /><br />I'm building an outdoor sensor network to monitor soil moisture, temperature, and humidity, and would like to use a standalone xbee at the remote site. Your power consumption numbers are very reassuring.<br /><br />I will be building a soil moisture probe using two galvanized nails. My concerns are that 1) the necessary voltage divider circuit will be consuming power even during the xbee's sleep cycle, and 2) as I understand it, constant voltage across the nails will cause corrosion over time. <br /><br />I believe the best way to resolve both issues is to have the probe "powered off" during the xbee's sleep cycles, saving power and mitigating corrosion.<br /><br />I can't tell based on your posts if you are powering your temperature sensor all of the time, or if you are using a digital output pin or some other magic to power up the sensor periodically.<br /><br />I'd appreciate any thoughts you may have on the topic. Thank you.Matthttps://www.blogger.com/profile/14743399618698575278noreply@blogger.comtag:blogger.com,1999:blog-969527591696668103.post-26875642793595162352013-09-25T02:23:30.438-07:002013-09-25T02:23:30.438-07:00Hi Massimo,
at the moment I'm using 3 AA cells...Hi Massimo,<br />at the moment I'm using 3 AA cells for some sensors which means the voltage could be 4.5 volts or higher. That's way too much for the XBee so I have to lower the voltage to a maximum of 3.6 volts (XBee works from about 2.7 to 3.6 volts). To utilize the batteries which are normally discharged to about 1.1 volts before getting bad, I chose the 3.3 volt LDO.<br /><br />Best regards,<br />MarkusMarkushttps://www.blogger.com/profile/12319820154420835740noreply@blogger.comtag:blogger.com,1999:blog-969527591696668103.post-40198331917809013982013-09-22T07:17:51.887-07:002013-09-22T07:17:51.887-07:00Hi Markus, thanks for you presentation: that's...Hi Markus, thanks for you presentation: that's what I was looking for.<br />Just a question: why a voltage regulator if you are using battery? I mean, since it is not a classic 78xx that maintains a fixed voltage (e.g 3.3V) and it follows Vin "stabilizing" it, using batteries it should not be needed. Where I'm wrong?<br /><br />Thanks,<br />MassimoAnonymousnoreply@blogger.com