Arduino Input multiplexer

22 Feb 2013

This is my latest arduino shield that I made to experiment.

It is based on the 74ls151 input multiplexer, you can add more to eatch input that you need turning it in to an 8 bit input.

Here are some pictured and a basic schematic and code to read it.

Note, the resistor stripe is connecting the inputs to ground for use with switches, remove them to have a true digital input.

Have fun using it its very usefull, I know I will.

Attachments:




Digital_Input_Multiplexer.ino.zip
	Digital input multiplexer.pdf

tabarus12 over 12 years ago

Here a corrected version of the multiplexer program.

Ive added a correction to the array and a for routine to pront serial data to port. Enjoy

#include<Streaming.h>

int b0 = 8; //Declare bit 0 pin
int b1 = 9; //Declare bit 1 pin
int b2 = 10; //Declare bit 2 pin
int d1 = 11; //Declare data pin 1
int d2 = 12; //Declare data pin 2

int data1[9] = {0,0,0,0,0,0,0,0}; //Declare data 1 array
int data2[9] = {0,0,0,0,0,0,0,0}; //Declare data 2 array
int a = 1; //Declare array position variable

void setup() {
pinMode(b0,OUTPUT); //Set bit cero pin to output
pinMode(b1,OUTPUT); //Set bit one pin to output
pinMode(b2,OUTPUT); //Set bit two pin to output

pinMode(d1,INPUT); //Set data pin 1 to input
pinMode(d2,INPUT); //Set data pin 2 to input

Serial.begin(9600); //Start serial port transmition
}

void loop() {
a=1; //Set array position to 1

for(a=1; a<=9; a++) { //Encrease aray position
    Bin(); //Call for binary print run
    if(digitalRead(d1) == HIGH) { //On data pin 1 enable
      data1[a]=1; //Set data array 1 position value to 1
    }
    else { //On data pin 1 disabled
      data1[a]=0; //Set data 1 array 1 position value to 0
    }
    if(digitalRead(d2) == HIGH) { //On data pin 2 enable
      data2[a]=1; //Set data array 2 position to 1
    }
    else { //On data 2 pin disable
      data2[a]=0; //Set data aray 2 position to 1
    }
    delay(50); //Delat for slow IC
              //Remove if using fast speed IC
}
a=1;
Serial << " Mux A   MuxB" << endl;
for(a=1; a<=8; a++){
    Serial << data1[a];
}
a=1;
Serial << " ";
for(a=1; a<=8; a++) {
    Serial << data2[a];
}
a=1;
Serial << endl;
//Print data array 1 and 2 value to serial port
}

void Bin() { //Binary print routine
switch (a) { //Select on array position
    case 1: //On first case
      digitalWrite(b0, LOW); //Set bin 0 pin to 0
      digitalWrite(b1, LOW); //Set bin 1 pin to 0
      digitalWrite(b2, LOW); //Set bin 2 pin to 0
      break; //Break case
    case 2: //On second case
      digitalWrite(b0, HIGH); //Set bin 0 pin to 1
      digitalWrite(b1, LOW); //Set bin 1 pin to 0
      digitalWrite(b2, LOW); //Set bin 2 pin to 0
      break; //Break case
    case 3: //On third case
      digitalWrite(b0, LOW); //Set bin 0 pin to 0
      digitalWrite(b1, HIGH); //Set bin 1 pin to 1
      digitalWrite(b2, LOW); //Set bin 2 pin to 0
      break; //Break case
    case 4: //On fourth case
      digitalWrite(b0, HIGH); //Set bin 0 pin to 1
      digitalWrite(b1, HIGH); //Set bin 1 pin to 1
      digitalWrite(b2, LOW); //Set bin 2 pin to 0
      break; //Break case
    case 5: //On fifth case
      digitalWrite(b0, LOW); //Set bin 0 pin to 0
      digitalWrite(b1, LOW); //Set bin 1 pin to 0
      digitalWrite(b2, HIGH); //Set bin 2 pin to 1
      break; //Break case
    case 6: //On sixth case
      digitalWrite(b0, HIGH); //Set bin 0 pin to 1
      digitalWrite(b1, LOW); //Set bin 1 pin to 0
      digitalWrite(b2, HIGH); //Set bin 2 pin to 1
      break; //Break case
    case 7: //On seventh case
      digitalWrite(b0, LOW); //Set bin 0 pin to 0
      digitalWrite(b1, HIGH); //Set bin 1 pin to 1
      digitalWrite(b2, HIGH); //Set bin 2 pin to 1
      break; //Break case
    case 8: //On eight case
      digitalWrite(b0, HIGH); //Set bin 0 pin to 1
      digitalWrite(b1, HIGH); //Set bin 1 pin to 1
      digitalWrite(b2, HIGH); //Set bin 2 pin to 1
      break; //Break case
}
}
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