Table 1. Airflow sensor parameters.

Parameters	Specifications
Module dimensions	Length 3 cm x width 2.1 cm
PCBa thickness	1.6 mm
Total module thickness	6 mm
Module weight	55 g (including breath sensor)
Supply voltage	DCb 3.3V/5V
Output signal	Serial port data output, raw pulse signal output, and TTLc level output

^aPCB: printed circuit board.

^bDC: direct current.

^cTTL: transistor-transistor logic.