74HC153 ( Dual 4-input Multiplexer) 74HC30 each slot is made of

each slot is made of a special material that is sensitive to IR

The shield sits on top of your Arduino and turns it into a simple controller

Distance measuring range: 15 cm to 150 cm

For sensor temperature :-40 to 125 °C

NFC modules

74HC153 ( Dual 4-input Multiplexer) 74HC30 each slot is made ofIntroduction : 74HC153 is a dual 4 input multiplexer. The device features independent enableinputs (nE) and common data select inputs (S0 and S1). For each multiplexer, the select inputsselect one of the four binary inputs and routes it to the multiplexer output (nY). A HIGH on E forcesthe corresponding multiplexer outputs LOW. Inputs include clamp diodes. This enables the use ofcurrent limiting resistors to interface inputs to voltages in excess of