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--- chip:weatherstation [2016/05/22 18:14] – [Intro] rlunaro
+++ chip:weatherstation [2022/12/02 22:02] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Construir una estación meteorológica con chip ======
+====== Making a Digital Anemometer with Raspberry PI Zero ======
 ===== Intro =====
-Quiero ver si es viable construir una estación meteorológica que cuente con estos requisitos:
+I want to make a digital anemometer with raspberry pi zero. The idea is to left the device in the wild and this device must send back to me reads of wind velocity and direction remotely vía cell modem.
-  - medias de presión, humedad, temperatura y dirección y velocidad del viento
+In other words, the device must have:
-  - lo más económica posible
-  - solar-powered, que se pueda poner autónomamente en el campo
-  - que transmita los datos a través de internet
-Para ello he pensado utilizar los siguientes elementos:
+  - Solar panels and a battery: the device must be self-powered
+  - Some kind of power management: to stabilize the power of the battery and adapt it to the raspi and to the modem
+  - A hsdpa modem: to provide internet connectivity
+  - Some SBC: raspberry pi zero is a great candidate
-  - [[https://getchip.com|Chip], el ordenador de 9 dólares -> 19$ porque es necesario un adaptador VGA para las configuraciones iniciales
+===== Making some calculations =====
-  - Celula solar (posiblemente [[https://www.amazon.es/dp/B007HAZY8Y|esta]] sería adecuada) --> 28 euros
-  - Una bateria lipo de 8000 mah [[http://es.aliexpress.com/store/product/3pcs-lot-3-7V-1100mah-15C-1S-VOLT-20C-Lipo-Battery-Akku-For-RC-Helicopter-free/603538_2024590889.html?spm=2114.04020208.3.52.YKj7Jo&ws_ab_test=searchweb201556_10,searchweb201602_4_10017_10021_507_10022_10020_10009_10008_10018_10019_101,searchweb201603_2&btsid=de915cfe-1c14-4c5d-ba3a-38e714f6e119|aquí hay una de 1100]], usaríamos 6 para comenzar, --> 20 euros
-  - Un modem GPRS con su correspondiente tarjeta sim (pendiente)
+I need to guess how much power the raspberry pi plus the modem will consume.
+|Device|Power consumption|
+|Raspberry Pi Zero| 120 mA (0.7W) | from ([[https://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi-zero-power|here]])|
+|Hsdpa Modem | 120 mA | (estimated) |
+The approximate consumption of this set is 240ma. For powering it, I've think that the [[https://www.adafruit.com/product/1903|PowerBoost 500 Basic - 5V USB Boost @ 500mA from 1.8V+]] will draw
+enough power for it.
+For the batteries, the circuit can have NiMH batteries or lipo batteries. I've think that NiMH batteries are
+cheaper and safer, so I decided to use them. Aproximately 7.200 mah will keep the weather up and running
+for more than 24 hours, which is convenient in case there is a cloudy day. Two
+[[https://www.amazon.es/Odec-Pilas-Recargables-Ni-MH-unidades/dp/B01D9WLJQ4|NiMh C batteries]] will do the
+job.
+Next, is the cell panel. A tough question. Do it correctly needs measures of solar power in your zone,
+estimations of the productivity of the solar panel based on this and a lot of things. But! I don't
+have the knowledge nor the time for it, so I decide to use this:
+[[https://es.aliexpress.com/store/product/5pcs-lot-Solar-Panel-Portable-Mini-6V-1W-Sunpower-DIY-Module-Panel-System-For-Solar-Lamp/1960862_32819874146.html]], joining as many panels as needed. Just an exercise of
+trial and error.
+The anemometer is pending.
+I have spent 77€ so far now.