This semiconductor gas sensor detects the presence of LPG,
isobutane, and propane at concentrations from 300 to 10,000
ppm. The sensor’s simple analog voltage interface requires only
one analog input pin from your microcontroller.
This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.8″, but it allows a typical continuous output current of up to 5 A.