74HC155 (Dual 2-to-4-line Decoders/demultiplexers) irf620n Gravity: Analog pH Sensor /

Gravity: Analog pH Sensor / Meter Pro Kit V2 For Arduino is a professional Arduino pH Sensor Meter Kit with an industrial electrode

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

Jacket Colour:                                  RED

The operating frequency is802MHz~928MHz

74HC155 (Dual 2-to-4-line Decoders/demultiplexers) irf620n Gravity: Analog pH Sensor /Description 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.