Digital read speed

Other Hardware Sensors
1

We are using and Arduino UNO and we're trying to figure out what the sample speed of the digital read sensor is? How many hertz can the arduino handle?

Thanks

2

Print micros() before the 'read' then print micros after the 'read', subtract.

You can use port manipulation to speed up a read.

.

3

byte X=PIND;Takes about three machine cycles (62.5 nanoseconds each).

4

What is it you're trying to read?
You can read a port and put into an array also.
For example, start reading when a pin goes low:

int x;
if ((PINB & 0b00000001) == 0){ // D8 low, start reading
for (x=0; x<1000; x=x+1){ // take 1000 samples
dataArray[x] = PIND; // read port D
}
}

The for loop adds some time to increment x and check it.
If you want it really fast, do a bunch of discrete reads:

x=0;
if ((PINB & 0b00000001) == 0){ // D8 low, start reading
dataArray[x] = PIND; // read port D
dataArray[1] = PIND;
dataArray[2] = PIND;
:
:
dataArray[998] = PIND;
dataArray[999] = PIND;
}