"Cool Projects, Epic Field Trips, & Awesome Makers" is how this online community defines itself. This looks like a good place to find projects for your class, and also to connect with other teachers and kids. The site uses Google+, so you can comment on individual projects. Check out the life-sized, non-electronic Angry Birds game!
Yes, I'm talking about the Dyson vacuum cleaner company. Their foundation provides free "engineering boxes" that allow students to take apart one of their machines to learn more about design and engineering. They also offer an "ideas box" for elementary students, and STEM challenges. When I tried to reserve one of these a few years ago, it was too late into the school year. You might have better luck.
This lesson plan starts with an explanation of how circuits work. Its objective is for students to build a working circuit and explain how to tell when the path is completed. The lesson materials are simple. The suggested age is 13 and up, so this would work well for either middle or high school science.
Maker Education sounds great, but some of the materials are (really) expensive! Although this page only lists a few starting places for funding sources, it will give you a few ideas for where to start.
This video shows middle and elementary school kids in Charlottesville, VA explaining their "maker" projects. One unmotivated student was transformed by "learning because he's doing something that matters to him," and a teacher recounts the day a student made connections with a math concept. My older son attends a school for children with learning disabilities, and his Technology class has built musical instruments and a prosthetic limb! Yes, the is the ultimate in student-directed learning!
So the "Maker Movement" sounds wonderful, but where to start? This article gives you information on where to learn more about it, how to involve parents and the community, and how to fund materials. There's also a section entitled 'Integrating Maker Education into the Curriculum,' with ideas for Science. Language Arts, Math, and Music. The 'Interactive Room Challenge' sounds really fun!