Could you tell us which multiplexer IC you are using? This way, we can help you better. Also, why do you need the 8 second cycle? Does it matter if it's a little shorter or longer? If timing does not have to be very precise it would make things a lot easier.
By the way: you say there are 30 sensors, but your table has 32...
The following pseudocode will not work on your Arduino, but you can use the same structure.
int sensorArray[32] // we will store our 32 sensor values here
// these pins control the multiplexer chips
int selectPinZero = 8;
int selectPinOne = 9;
int selectPinTwo = 10;
// these pins will receive the sensor values from the multiplexer chips
int inputPinOne = 0;
int inputPinTwo = 1;
int inputPinThree = 2;
int inputPintFour = 3;
void setup(){
// make sure the correct pins are inputs and outputs
pinMode(selectPinZero, OUTPUT);
pinMode(selectPinOne, OUTPUT);
pinMode(selectPinTwo, OUTPUT);
pinMode(inputPinOne, INPUT);
pinMode(inputPinTwo, INPUT);
pinMode(inputPinThree, INPUT);
pinMode(inputPinFour, INPUT);
}
// all done, now keep reading the sensors
void loop(){
// set selectPins so that each Multiplexer will output its first channel
digitalWrite(selectPinZero, HIGH); // or low, depending on your Multiplexer IC
digitalWrite(selectPinOne, HIGH); // or low, depending on your Multiplexer IC
digitalWrite(selectPinTwo, HIGH); // or low, depending on your Multiplexer IC
// start reading sensors
int i = 0;
while(i<32){
sensorArray[i] = analogRead(inputPinOne);
i++; // variable i was 0, now 1
sensorArray[i] = analogRead(inputPinTwo);
i++; // variable i was 1, now 2
sensorArray[i] = analogRead(inputPinThree);
i++; // variable i was 2, now 3
sensorArray[i] = analogRead(inputPinFour);
i++; // variable i was 3, now 4
/*
use digitalWrite() on all the selectPins to make the Multiplexer IC output the next channel
*/
delay(1000); // wait 1000 milliseconds
}
/*
this will repeat until all 32 sensors are read and stored in the array
*/
}
This code is by no means optimized, but written to make it easy for you to understand. Good luck!
