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11 digital input/output pins
and is suitable for detecting LPG
ensuring stable and responsive control
compatible with multiple shields
this module will send the card number to Arduino by UART You can further connect the relay Arduino shield to your Arduino in order to enable the simple door keeper controlling system
4-Line to 16-Line Decoder/Demultiplexer IC - 74HC154 TEC1 12715 11 digital input/output pins4 Line to 16 Line Decoder Demultiplexer IC 74HC154 This is the 74HC Series 74HC154 IC, Each of these 4 line to 16 line decoders IC utilizes TTL circuitry to decode four binary coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs, G1 and G2, are LOW. The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input