Good cheat sheet on Lego Wedo with Scratch and Makey Makey:
https://readingpower.files.wordpress.com/2015/09/319ee-mastercheatsheet.pdf
Good idea for challenges at: http://kidsengineer.com/?p=646
Below is instruction challenge sheet based on challenge above. Car in image far below was designed, built and completed, including with sensors, using Lego Wedo software they had not used before, so car stopped when anything in front of it, by 1 group (13 years old), but other 4 groups did not complete in 45 mins, so need more time or easier challenge:
AHS Makerspace 