More than 100 schools were challenged to build projects around the credit card-sized computer that could help to ‘save the planet’. And these entries were whittled down to the nine finalists judged at the IET, at Savoy Place, last week.

The imaginative entries included ‘Raspberry-Sky’, to monitor air pollution by decoding aircraft ADB-S data (using “dump1090“) and crowd-sourcing the results; ‘Smart Bin’, which uses the Clarifai AI system to categorise images via the Cloud (AWS); and ‘Recycle Michael’, another smart bin, which interfaced a bar-code scanner to a Pi to identify the materials being thrown away…