Pololu Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack) Shipping:2-4 Weeks As described above

As described above

The Sound Detector not only provides an audio output

5V Device Current (Max) 50mA Receiver Peak Infrared Wavelength 950nm Carrier Frequency 38kHz Directivity (50% reduction in distance) ±45 degrees Transmission Distance 20 meters 36/40kHz Reception loss of sensitivity 40% LED transmitter Infrared Wavelength 950nm Directivity (Half intensity) ±25 degrees

Pololu's assortment of stepper motors

The expansion board uses a pair of Freescale MC33926 motor drivers

Pololu Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack) Shipping:2-4 Weeks As described aboveThese universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 3 mm diameter motor shafts. The set includes two hubs, two M3 set screws for securing the hubs to motor shafts, and one 1. 5 mm Allen wrench for use with the set screws. Each hub has four threaded mounting holes for M3 screws (not included). Mini gearmotor with bracket and hub. These universal mounting hubs are designed to work with most 3 mm diameter shafts ,