The Electric Imp is a WIFI module with a brain. In some use cases it’s used to help connect your device to the cloud, as one of those ‘internet of things’. On other cases (like this one), it is the thing. Marcus has a cool little project that takes temperature readings and pushes them to the cloud.
Since the Imp is pretty power savvy, Marcus was able to power the project using a solar panel and charger. From there it uses a TMP36 analog temperature module to pull readings from. The temperature is read using the ADC and turned into an actual temperature number. The imp handles the rest by using the ThingSpeak api, which then collects and graphs the data.
Source code and schematic included on slickstreamer.