reading 2 different sensors

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

I would like to see if it is possible to read an analog input pin with a 4051 and read a digital pin with an ultrasound sensor at the same time (or as close as).
here's what i've got so far:

int pingPin=8;
int MuxPin1=2;
int MuxPin2=3;
int MuxPin3=4;
int AnaInPin1=4;

//Declare variables
int val = 0;
int pingValue = 0;
int timecount=0;
int MuxVal1 = 0;
int MuxVal2 = 0;
int MuxVal3 = 0;
int BinVal = 0;
int N = 0;
byte data_send = 0;
byte data_in = 0;


//BinPat is used for figuring out the High / Low (1/0) values of the MUX control pins

int BinPat [] = {000, 1, 10, 11, 100, 101, 110, 111};


void setup()

{

 //Initialize digital pins and serial communication speed

 pinMode(MuxPin1, OUTPUT);

 pinMode(MuxPin2, OUTPUT);

 pinMode(MuxPin3, OUTPUT);

 beginSerial(19200);

}


void loop() {


if(Serial.available() > 0) { 
     data_in = Serial.read(); 
     if(data_in == 76) {
           readPotValues();
           readPingValues();
           }
}

  delay (10);

}


void readPotValues()

{

for (N=0; N<=7; N++)

   {
     BinVal = BinPat[N];
     MuxVal1 = BinVal & 0x01;
     MuxVal2 = (BinVal>>1) & 0x01;
     MuxVal3 = (BinVal>>2) & 0x01;
     digitalWrite(MuxPin1, MuxVal1);
     digitalWrite(MuxPin2, MuxVal2);
     digitalWrite(MuxPin3, MuxVal3);
   }
   

}

void readPingValues()

{
  timecount = 0;
  val = 0;
  pinMode(pingPin, OUTPUT);
  
  digitalWrite(pingPin, LOW); // Send low pulse
  delayMicroseconds(2); // Wait for 2 microseconds
  digitalWrite(pingPin, HIGH); // Send high pulse
  delayMicroseconds(5); // Wait for 5 microseconds
  digitalWrite(pingPin, LOW); // Holdoff

  pinMode(pingPin, INPUT); // Switch signalpin to input
  val = digitalRead(pingPin); // Append signal value to val
  while(val == LOW) { // Loop until pin reads a high value
    val = digitalRead(pingPin);
  }
  
  while(val == HIGH) {
    val = digitalRead(pingPin);
    timecount = timecount +1;
  }
    
pingValue = timecount;

 data_send=analogRead(AnaInPin1) / 4;
     Serial.print(data_send);
     Serial.print(pingValue);
     Serial.flush
}
2

You forgot the actual call to analogRead() in the readPotValues()
function. and i think you can omit the delay(10) from the main loop, since you are only reading and sending data on demand.

EDIT:

Ups i did not see that you only wanted to read one pin and you do it in another place.