Sound-Following 3pi Robot

This sound-following 3pi robot uses three Electret microphone breakout boards and two 74HC4052 multiplexers. Here is a video of the robot in action:

For more details, see this thread on the Pololu forum.

Grating-based External Cavity Tunable Laser

Grating-Based External Cavity Tunable Laser,Red Grating Laser,Laser Grating Reflection,Grating Reflector Laser

AcePhotonics Co.,Ltd. , https://www.cgphotonics.com