Pololu 12V High-Power 99:1 25D Metal Gearmotor _ARD_SHIELD_SERIAL If you want a super

If you want a super tiny version of the same basic setup

and select the active one manually or automatically (by GPIO)

so no need for a separate power supply)

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Measure indoor air quality—total volatile organic compounds (TVOC) and equivalent CO2 (eCO2)—with this digital sensor for Raspberry Pi and Arduino

Pololu 12V High-Power 99:1 25D Metal Gearmotor _ARD_SHIELD_SERIAL If you want a superThis Pololu 25D gearmotor consists of a high power, 12V brushed DC motor combined with a 99: 1 (98. 78: 1) metal spur gearbox. The gearmotor is cylindrical, with a diameter just under 25mm, and the D shaped output shaft is 4mm in diameter and extends 12. 5mm from the faceplate of the gearbox. In general, these kinds of motors can run at voltages above and below their nominal voltages (they can begin rotating at voltages as low as 1V); lower voltages