Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
Beide Seiten der vorigen Revision Vorhergehende Überarbeitung Nächste Überarbeitung | Vorhergehende Überarbeitung | ||
wifi_sensor [2015/04/04 01:51] karl [Poster in German Language] |
wifi_sensor [2017/04/04 06:43] (aktuell) karl [Research Links] |
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- | For now (2015-03-01) this page is a mixture of concept, documentation and product preview. Please stay tuned for the final product and software! | + | For now (2015-03-01) this page is a mixture of concept, documentation and product preview. Please stay tuned for the final product and software! |
- | ====== Web Interface online ====== | + | Pleas visit the News-site for chronological updates: [[WolkenThermometer-News]] \\ |
- | 4.4.2015 | + | In addition you can sign up to the news letter: |
- | {{ :wifi-sensor:wt-proto-mounted-outside.jpg? | + | |
- | You can have a glance at current measurements of the prototype: | + | < |
- | [[http://me.zeilhofer.co.at/wt-test/datafetch.php?maxlen=1&history=1& | + | <!-- Begin MailChimp Signup Form --> |
- | [[http://me.zeilhofer.co.at/wt-test/datafetch.php?maxlen=1000& | + | <link href="//cdn-images.mailchimp.com/ |
+ | <style type=" | ||
+ | # | ||
+ | /* Add your own MailChimp form style overrides in your site stylesheet or in this style block. | ||
+ | We recommend moving this block and the preceding CSS link to the HEAD of your HTML file. */ | ||
+ | </ | ||
+ | <div id=" | ||
+ | <form action="// | ||
+ | < | ||
+ | < | ||
+ | <div class=" | ||
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+ | <!--End mc_embed_signup--> | ||
+ | </ | ||
- | * maxlen is limited to 1000, and represents the number of data points | ||
- | * history is a value in hours (max. xxx hours in the past) | ||
- | * key[1] is the public key of the prototype | ||
- | The result is in the form | ||
- | < | ||
- | |||
- | Example: | ||
- | AtAH8ziYVr& | ||
- | Means: 0.31°C and 59.1% battery | ||
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- | The PCBs for the first batch of 50 pieces including an SMD stencil was kindly sponsored by WEdirekt | + | The PCBs for the first batch of 50 pieces including an SMD stencil was kindly sponsored by WEdirekt, the online shop for PCBs and stencils from Würth |
- | [[http:// | + | [[http:// |
===== Hardware ===== | ===== Hardware ===== | ||
* ATmega328 with 8MHz resonator (based on the Arduino Nano328) | * ATmega328 with 8MHz resonator (based on the Arduino Nano328) | ||
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===== Hardware Details ===== | ===== Hardware Details ===== | ||
- | Here you can download the current version of the schematic: | + | Here you can download the current version of the schematic, PCB files and the bill of materials:\\ |
- | http://www.zeilhofer.co.at/documents/wifi-sensor/ | + | https://github.com/KarlZeilhofer/WolkenThermometer-kicad |
==== Measuring Battery Voltage ==== | ==== Measuring Battery Voltage ==== | ||
We use the internal ADC and an external shunt reference (LM431SCCM32X, | We use the internal ADC and an external shunt reference (LM431SCCM32X, | ||
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The user allways can monitor the battery condition with the app for the smart phone. | The user allways can monitor the battery condition with the app for the smart phone. | ||
==== Battery Pack ==== | ==== Battery Pack ==== | ||
- | The battery is assembled out of 3 pieces of AAA NiMH cells. In total we have nominal 3.6V and 800mAh. | + | < |
+ | The battery is assembled out of 3 pieces of AAA NiMH cells. In total we have nominal 3.6V and 800mAh.</ | ||
+ | Instead of the NiMH battery, a lithium battery will be used, since the NiMH type is not able to deliver enough current at cold temperatures. | ||
If the solar panel delivers enough power, we can increase the data transmission frequency. If the thermometer is in a rather dark area, we reduce the frequency to save power. | If the solar panel delivers enough power, we can increase the data transmission frequency. If the thermometer is in a rather dark area, we reduce the frequency to save power. | ||
- | Exact measurements on power consumption of the WiFi module and also the whole circuit it self have to be done, to calculate the optimum function for transmission rate. | + | Exact measurements on power consumption of the WiFi module and also the whole circuit it self have to be done, to calculate the optimum function for transmission rate. |
===== Firmware Details ===== | ===== Firmware Details ===== | ||
+ | Here you can find the source code on Github: \\ | ||
+ | https:// | ||
==== Structure ==== | ==== Structure ==== | ||
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* aes256: http:// | * aes256: http:// | ||
* AVR Fuse Calculator http:// | * AVR Fuse Calculator http:// | ||
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