This Is A Very Convenient 16-Channel Analog/Digital Multiplexing/Demultiplexing CD74HC4067 Breakout Board. This Chip Acts Like A Rotary Switch - It Internally Routes A Common Pin (Com In The Schematic, Sig On The Board) To One Of 16 Channel Pins (Chanxx). It Can Handle Digital And Analog Signals (The Voltage Cannot Be Higher Than VCC), And It Can Be Connected In Any Direction. To Control It, Connect The 4 Digital Outputs To The Chip'S Address Select Pins (S0-S3) And Send It The Binary Address Of The Channel You Want (See Datasheet For Details). This Allows You To Connect Up To 16 Sensors To Your System Using 5 Pins! Since Mux/Demux Can Also Handle Digital Signals, You Can Use It To mit Ttl-Level Serial Data To Multiple Devices. For Example, You Can Use It To Connect The Tx Pins Of 16 Devices To One Rx Pin On A Microcontroller. You Can Then Choose Any Of The 16 Devices To Listen To. If You Want Two-Way Communication, You Can Add A Second Board To Route The Tx Line Of The Microcontroller To The Rx Line Of The 16 Devices. By Using Multiple Boards, You Can Create Similar Arrangements For I2c, SPI, ETC. The Internal Switch Is Bidirectional, Supports Voltage Between Ground And Vcc, Has Low "On" Resistance And Low "OFF" Leakage, And Performs "Break Before Make" Switching To Prevent Crosstalk. The Board Also Breaks Out The Chip'S "Enable" Pin, Which, When Driven High, Will Completely Disconnect The Common Pin (All Switches "Off"). 1. Product Name: CD74HC4067 High-Speed CMOS Analog Multiplexer 16-Channel Analog Multiplexer 2. Function: 16-Channel Analog Signal Switch Using Cd74hc4067 3. Analog Signal Input: C0-C15 16 Channels 4. Analog Output: DIG 5. Channel Control: S0-S3 6. Material: PCB 7. Size: 4.2 x 2.1cm 8.Color: Blue Package Contents: 10 x Channel Analog Multiplexer Only the above package content, other products are not included. Note: Light reflection Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!