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en:tech:sensorlogger [2020/10/15 17:25] – [Hardware] bullaren:tech:sensorlogger [2020/10/15 18:30] (current) – external edit 127.0.0.1
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 An antenna must also be connected to the RFM12 module. Usually 1/4 lamba so about 8.3cm. But since there was still space on the PCB, I dared to try a PCB variant in a meandering structure. There is also a nice design note from Texas Instruments (DN024). The result was a bit off, however, because the <m> epsilon_r </m> of my favorite PCB maker turned out a bit different in reality. The maximum gain was about 790MHz and could then be reduced to 868MHz with a final -6dB gain. This means that reception through concrete ceilings or walls is also feasible. An antenna must also be connected to the RFM12 module. Usually 1/4 lamba so about 8.3cm. But since there was still space on the PCB, I dared to try a PCB variant in a meandering structure. There is also a nice design note from Texas Instruments (DN024). The result was a bit off, however, because the <m> epsilon_r </m> of my favorite PCB maker turned out a bit different in reality. The maximum gain was about 790MHz and could then be reduced to 868MHz with a final -6dB gain. This means that reception through concrete ceilings or walls is also feasible.
 ==== Software ==== ==== Software ====
-The software was created with AVR STudio 6 and AVR-Dragon is on the handicraft table as a debugger. A UART I / F is on board as support, which then outputs the printf instructions on my MAC via a level converter and the RS232 / USB adapter without complaint. A command I / F also allows direct control via the same interface. A small web server is also integrated for normal operation. The entire package including Ethernet and SD support requires approx. 85K FLASH and 12.5K RAM memory.+The software was created with AVR STudio 6 and an AVR-Dragon as a debugger. An UART I/F is on board as support, which then outputs the printf instructions on my MAC via a level converter and the RS232/USB adapter without complaint. A command I/F also allows direct control via the same interface. A small web server is also integrated for normal operation. The entire package including Ethernet and SD support requires approx. 85K FLASH and 12.5K RAM memory.
  
 ==== Outlook ==== ==== Outlook ====
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 ==== Links ==== ==== Links ====
-  * [[http://hackaday.com/2011/06/13/reverse-engineering-wireless-weather-stations/]] IT + protocol description +  * [[http://hackaday.com/2011/06/13/reverse-engineering-wireless-weather-stations/]] IT+ protocol description 
-  * [[http://fredboboss.free.fr/tx29/]] IT + protocol description +  * [[http://fredboboss.free.fr/tx29/]] IT+ protocol description 
-  * [[http://gcrnet.net/node/32]] IT + protocol description+  * [[http://gcrnet.net/node/32]] IT+ protocol description
   * [[http://www.ti.com/lit/an/swra227e/swra227e.pdf]] Antenna Design Note DN024   * [[http://www.ti.com/lit/an/swra227e/swra227e.pdf]] Antenna Design Note DN024
   * [[http://www.mikrocontroller.net/articles/RFM12]] Receiver module description   * [[http://www.mikrocontroller.net/articles/RFM12]] Receiver module description
en/tech/sensorlogger.1602782735.txt.gz · Last modified: 2020/10/15 18:25 (external edit)

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