74HC155 (Dual 2-to-4-line Decoders/demultiplexers) irf620n but also can use the

but also can use the digital pin of Arduino to power on and reset the SIM900 module

Logic Diagram

Aerospace applications (pressure force distribution measurements)

and communication modules

3 to 5V power and I/O

74HC155 (Dual 2-to-4-line Decoders/demultiplexers) irf620n but also can use theDescription This circuit features dual 1 line to 4 line demultiplexer with individual strobes and common binary address input. When both sections are enabled by the strobes, the common binary address inputs sequentially select and route associated input data to the appropriate output of each section. The individual strobes permit activating or inhibiting each of the 4 bit sections as desired. Data applied to input 1C is inverted through its outputs.