| MEMS are awesome! Here are some other MEMS devices: - hard drive read/write heads (the platters are debatable) - inkjet printer nozzles (this is why making a DIY inkjet printer is nontrivial) - air pressure sensors (e.g., for car tires) - precise frequency filters for smartphone wireless communication - oscillators (https://news.ycombinator.com/item?id=18340693) - very tiny microphones for smartphones (speakers are harder) - Digital Micromirror Devices (DMDs): arrays of tiny mirrors used in most projectors - microfluidics ("lab-on-a-chip" stuff for fast disease testing, DNA sequencing, cell manipulation, etc) And a couple other semiconductor applications: - LCD/LED screens (monitors, phones, laptops, etc) (these are made on a glass surface instead of a silicon wafer but use the same basic manufacturing techniques) - laser diodes (laser pointers, CD / Blu-ray players) - many quantum computers |