Raspberry is great board for building internet of things stuff. It is powerful and low power to be used with small solar panel anywhere in the field. PiJuice have been working on great solar powered weather station project. It is basically a fusion of two great projects – PiJuice which takes care of solar power management and AirPi, which carries tons of sensors. The problem he run in to was the sensor board, which connects directly to Pi header, but for outside use it is better to keep electronics sealed. So he build his own version of sensor board based on same AirPi.
He used Raspberry Pi A+ for its low power consumption and for remote connection hes chosen EFCom Pro GPRS/GSM module which can send text directly to cell phone. Since most of sensors hace analog interface he used MCP3008 ADC converter which can take up to 8 analog sensors. So far there are only three sensors used – LDR, gas sensor (TGS2600) and LM35 temperature sensor. SO the list can be expanded later. Raspberry Pi communicates with GSM module via AT commands. Then python script takes care of reading sensors and sending data via serial interface to GSM module. User gets nicelly formatted text messages with all readings.