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16-Channel Mux (HP4067)

A 16-channel analog/digital multiplexer/demultiplexer for massively expanding your microcontroller's I/O pins.

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HP4067 Module

This module acts like a 16-way rotary switch. Using four digital control pins, you can connect the single common signal pin (SIG) to any one of the 16 channel pins (C0-C15). It works with both digital and analog signals.

Logic ComponentsMultiplexerAnalog

Overview

If you run out of pins on your Arduino (especially analog inputs), the HP4067 allows you to read 16 analog sensors using only one analog pin and four digital pins. It operates bidirectionally, so it can also act as a demultiplexer (routing a single signal to 16 different destinations).

Pin Reference

Pin	Type	Description
VCC	power	Power supply (2V to 6V).
GND	power	Common ground.
EN	digital	Enable pin. Active LOW (connect to GND to enable).
S0, S1, S2, S3	digital	Control pins. These 4 bits form a binary number (0-15) to select a channel.
SIG	analog	The common signal pin. Connects internally to the selected C0-C15 pin.
C0 to C15	analog	The 16 multiplexed channels.

Configurable Attributes

This component has no configurable attributes.

Working Principle

The four select pins (S0, S1, S2, S3) are treated as a 4-bit binary number. S0 is the Least Significant Bit (LSB).

• 0000 (All LOW) connects SIG to C0.
• 0001 (S0 HIGH) connects SIG to C1.
• 1111 (All HIGH) connects SIG to C15.

Wiring Diagram

Example of connecting the HP4067 16-Channel Mux to an Arduino Uno.

Example Arduino Code

This code loops through all 16 channels and reads their analog values.

// Define the selection pins
const int s0 = 2;
const int s1 = 3;
const int s2 = 4;
const int s3 = 5;

// Define the signal pin
const int sigPin = A0;

void setup() {
  Serial.begin(9600);
  pinMode(s0, OUTPUT);
  pinMode(s1, OUTPUT);
  pinMode(s2, OUTPUT);
  pinMode(s3, OUTPUT);
}

void loop() {
  // Loop through all 16 channels
  for (int channel = 0; channel < 16; channel++) {
    // Write the binary value to the selection pins
    digitalWrite(s0, bitRead(channel, 0));
    digitalWrite(s1, bitRead(channel, 1));
    digitalWrite(s2, bitRead(channel, 2));
    digitalWrite(s3, bitRead(channel, 3));
    
    // Give the mux a tiny bit of time to switch (optional but good practice)
    delayMicroseconds(10);
    
    // Read the value from the selected channel
    int val = analogRead(sigPin);
    
    Serial.print("Channel ");
    Serial.print(channel);
    Serial.print(": ");
    Serial.println(val);
  }
  
  Serial.println("---");
  delay(1000);
}

Simulation Notes

• In the simulator, the multiplexer accurately propagates analog voltages, PWM signals, and digital states bidirectionally between the SIG pin and the actively selected C channel.
• If EN is driven HIGH, the multiplexer disconnects SIG completely (high impedance state).

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