void setup(){
Serial3.begin(9600);
Serial.begin(9600);
9600 baud is not going to help with the speed issues. Can't you go faster?
Your code:
int req = 5; //mic REQ line goes to pin 5 through q1 (arduino high pulls request line low)
int dat = 2; //mic Data line goes to pin 2
int clk = 3; //mic Clock line goes to pin 3
int i = 0; int j = 0; int k = 0;
byte mydata[14];
int num;
void setup(){
Serial3.begin(9600);
Serial.begin(9600);
pinMode(req, OUTPUT);
pinMode(clk, INPUT);
pinMode(dat, INPUT);
digitalWrite(clk, HIGH); // enable internal pull ups
digitalWrite(dat, HIGH); // enable internal pull ups
digitalWrite(req,LOW); // set request at LOW
}
void loop(){
// get data from mic
digitalWrite(req, HIGH); // generate set request
for( i = 0; i < 13; i++ ) {
k = 0;
for (j = 0; j < 4; j++) {
while( digitalRead(clk) == LOW) { } // hold until clock is high
while( digitalRead(clk) == HIGH) { } // hold until clock is low
bitWrite(k, j, (digitalRead(dat) & 0x1)); // read data bits, and reverse order )
}
// extract data
mydata[i] = k;
// sign = mydata[4];
// decimal = mydata[11];
// units = mydata[12];
}
// assemble measurement from bytes
char buf[7];
for(int lp=0;lp<6;lp++)
buf[lp]=mydata[lp+5]+'0';
buf[6]=0;
num=atol(buf); //assembled measurement, no decimal place added
Serial3.println(num);
Serial.println(num);
digitalWrite(req,LOW);
// delay(25);
}
I don't see Serial3.available or Serial3.read in there. Are you trying to do you own software serial? Why?