Differences

This shows you the differences between two versions of the page.

--- chip:weatherstation [2018/03/09 19:49] – rlunaro
+++ chip:weatherstation [2022/12/02 21:02] (current) – external edit 127.0.0.1
@@ Line 8: / Line 8: @@
   - 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
+  - Some kind of power management: to stabilize the power of the battery and adapt it to the raspi and to the modem
-the raspi and to the modem
   - A hsdpa modem: to provide internet connectivity
-  - Some SBC: raspberry pi zero is a great candidate, C.H.I.P. can be other
+  - Some SBC: raspberry pi zero is a great candidate
 ===== Making some calculations =====
@@ Line 17: / Line 16: @@
 I need to guess how much power the raspberry pi plus the modem will consume.
-In other words, a device that:
+|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) |
-  - Is solar powered: the idea is to left this device in the open and send
+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.
-Quiero ver si es viable construir una estación meteorológica que cuente con estos requisitos:
+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.
-  - medias de presión, humedad, temperatura y dirección y velocidad del viento
+Next, is the cell panel. A tough question. Do it correctly needs measures of solar power in your zone,
-  - lo más económica posible
+estimations of the productivity of the solar panel based on this and a lot of things. But! I don't
-  - solar-powered, que se pueda poner autónomamente en el campo
+have the knowledge nor the time for it, so I decide to use this:
-  - que transmita los datos a través de internet
+[[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.
-Para ello he pensado utilizar los siguientes elementos:
+The anemometer is pending.
-  - [[https://getchip.com|Chip]], el ordenador de 9 dólares -> 19$ porque es necesario un adaptador VGA para las configuraciones iniciales
-  - 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)
-  - [[http://www.dfrobot.com/index.php?route=product/product&product_id=1308#.V0HbCXV97CK|Kit weather station]], 138$
-**Total: más de 200 euros**
+I have spent 77€ so far now.