So Im following the diagram here for wiring up a MC14067BCP:
http://fluidforms.eu/docs/MultiplexedArduinoWiringDiagram.pdf
The only difference being that I am doing one set of 16 sensors and not four. Additionally, my sensors are 5k - 250k LDRs (light sensitive resistors) that I have connected to ground on the end opposite of those connected to the connections shown in the diagram above.
When I run my sketch, the serial line shows output that is similar to what would be shown if no wires were connected to my analog in at all. (see the question here to see what I mean by that: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238854387) This is really stressing me out and it would be amazing if someone could enlighten me as to what is going on.
Here is my code:
int CONTROLpin1 = 2;
int CONTROLpin2 = 3;
int CONTROLpin3 = 4;
int CONTROLpin4 = 5;
int analogPin = 0;
// Variables:
int actualSensorValue = 0; // value from the analog input
void sendCommand(int value) {
Serial.println(value);
}
void setup() {
// set the states of the I/O pins:
pinMode(CONTROLpin1, OUTPUT);
pinMode(CONTROLpin2, OUTPUT);
pinMode(CONTROLpin3, OUTPUT);
pinMode(CONTROLpin4, OUTPUT);
pinMode(analogPin, INPUT);
Serial.begin(9600);
}
void loop() {
int i;
int j;
for (i=0; i <16; i++) {
// set control pins on the multiplexers
digitalWrite(CONTROLpin1, (i&15)>>3);//bit4
digitalWrite(CONTROLpin2, (i&7)>>2);//bit3
digitalWrite(CONTROLpin3, (i&3)>>1);//bit2
digitalWrite(CONTROLpin4, (i&1) );//bit1
// read the analogue inputs and send the values of the sensors.
Serial.println(i); // print which pin we are on
actualSensorValue = analogRead(analogPin);
sendCommand(actualSensorValue);
delay(1000);
}
}
Additionally, I have tried cutting it down to the bare minimum and only wiring up a single sensor. When looking at the output, there appears to be no change.
Here is a picture of the bare bones wiring (but to be clear my end goal is still the diagram at the top of this post).
(large version of same image: http://i.imgur.com/IaTD1.jpg)
