... | ... | @@ -60,3 +60,48 @@ Windows and Apple OS X. It is licensed under the |
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## Design notes
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### GPS passive antenna
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- http://www.smokingresistor.com/2013/11/16/gps-ground-plane/
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### GPS RF design guidelines
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- http://www.kitarm.com/project/ppsi/wikis/News#ppsi-v-1301-ppsi-for-wrpc_swtgz-released
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### Low power design
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- http://www.digikey.com/en-US/articles/techzone/2011/jun/ultra-low-power-mcus-enable-energy-harvesting-designs
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- http://www.silabs.com/Support%20Documents/TechnicalDocs/implementing-low-power-graphical-displays.pdf
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- http://www.digikey.com/en/articles/techzone/2014/jan/selecting-the-right-ultra-low-quiescent-current-ldo-regulator
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- http://www.ecnmag.com/articles/2012/07/specifying-right-ultra-low-iq-ldo
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### Backlight
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Use 0.5 or 1mm plexiglas sheet behind the LDC with four white LEDs.
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Here is a cheap plexiglas sheet
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supplier:
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http://www.plexiglas-shop.com/CH/fr/plexiglas-folie-5m9m5apyxic/plexiglas-folie-blanc-99532-gt-1-0-mm-iqq6a1wurpd~p.html
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\> Note: After some preliminary tests, it turn out that the plexiglas
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idea doesn't work well.
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Learn more on backlight:
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- [Tutorial video from 3M (1)](http://bcove.me/uqy0bbtv)
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- [Tutorial video from 3M (2)](http://bcove.me/uqy0bbtv)
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As optical films are hard to get as private customers, using backlight
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from broken cellphone display might be an
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alternative.
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### Battery life calculation
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- http://www.oregonembedded.com/batterycalc.htm
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- http://www.csgnetwork.com/batterylifecalc.html
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- http://www.ajdesigner.com/phpbatterylife/battery_life_peukert_number_time.php\#ajscroll
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