Hi Sean,
So, the enable lines are used to select which 32:1 MUX is on or off. If the enable is LOW all the switches are off. If it is HIGH the MUX is on. They are connected to the Digital Outputs of the 6527 like you said. The address lines (5 bits: A0-A4) are to control which switch (S1..S2..S3 etc.) is selected on the 32:1 MUX and are also connected to the output of the 6527. I have updated my program and attached it to this message.
NEW PROGRAM:
In the new program the outer for loop is to control the 4:1 MUX. The inner for loop is to control the 32:1 switching. The problem I am having now is selecting which MUX is on or off and synchronizing this action with the switching of my 32:1 MUX. Meaning, I want the first 32:1 mux to be switched on, then to switch through all 32 channels. Next switch the the second 32:1 mux, switch through all 32 channel. etc. until all 128 channels have been switched. In the new program I am using an arduino to control the ENABLE lines. I use VISA to automatically write a value through the serial port to turn each MUX on individually and one at a time. The code for the arduino can be seen below:
const int ledPin = 13; // the pin that the LED is attached to
int incomingByte; // a variable to read incoming serial data into
void setup() {
// initialize serial communication:
Serial.begin(9600);
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
}
void loop() {
digitalWrite(2,HIGH);
if (Serial.available() > 0) { // see if there's incoming serial data.
incomingByte = Serial.read(); // read the oldest byte in the serial buffer.
if (incomingByte == '0') {
digitalWrite(ledPin, HIGH); // if it's a 0, turn on the LED.
digitalWrite(3,HIGH); // 32:1 Mux #1 ON.
}
if (incomingByte == '1') { // if it's an 1 turn off the LED:
digitalWrite(ledPin, LOW);
digitalWrite(4,HIGH); // 32:1 Mux #2 ON
}
if (incomingByte == '2') { // if it's a 2 turn off the LED:
digitalWrite(ledPin, HIGH);
digitalWrite(5,HIGH); // 32:1 Mux #3 ON
}
if (incomingByte == '3') { // if it's a 3 turn off the LED:
digitalWrite(ledPin, LOW);
digitalWrite(6,HIGH); //32:1 Mux #4 ON
}
}
}
The program is turning the first mux on and switching through all 128 channels, the the third and switching through all 128 channels etc. I do not want it to do this because this is part of a long term experiment. Sorting the data will be a nightmare if I leave it this way. I hope I was able to answer the questions.
Thank you for your help,
S.L.
