I'm always interested in Lego tech stuff and noticed they're on sale in OfficeMax long time ago. I just found this one in clearance and looks like I missed some other interesting ones.
Normally these are for education (and cost a lot!!) but they work with powered up motors and sensors and vise versa.
sensors in clearance as well
Distance Sensor
Tilt Sensor
Motion Sensor
This LEGO® Education WeDo 2.0 Core Set was created to enhance students' curiosity and science skills. The set features a storage bin, sorting trays, labels, a Smarthub, Medium Motor, Motion Sensor, a Tilt Sensor, and enough building elements for two students. The accompanying desktop and tablet supported software provides an easy-to-use programming environment and includes the WeDo 2.0 Curriculum Pack, which covers life, physical, earth, space sciences and engineering. The eLearning program helps teachers to become confident users and features inbuilt assessment and an integrated documentation tool.
Thanks, that's Christmas sorted for my son