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MQ-2 Gas Sensor Module
The split-core type such as the SCT-013-000 CT in the picture is particularly suitable for DIY use
It's widely used in machiness
High Sensitivity Vibration Sensor Module
B three-pin PWM voltage input can be adjusted
Quad 2-Input Multiplexer IC - 74HC157 Offers MQ-2 Gas Sensor ModuleQuad 2 Input Multiplexer IC 74HC157 The 74HC Series 74HC157 is a 16 Pin Quad 2 Input Multiplexer IC having 2V to 6V Operating Voltage range with 1uA Low Input current and high noise immunity. It selects 4 bits of data from two sources under the control of a common data select input (S). The enable input (E) is active LOW. When E is HIGH, all of the outputs (1Y to 4Y) are forced LOW regardless of all other input conditions. Pinout: Pinout of 74HC157 IC
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