03-09-2015, 09:01 AM
(03-09-2015, 06:00 AM)chucketn Wrote: I ran Arvid's code for a few minutes, and an occasional zero shows up in each output, but no discernible pattern.
Chuck
That suggests to me that the inputs are not changing. I would expect a random pattern of ones and zeros, especially on the clock line which appears to be high ... or 1 ... for relatively long periods of time ... possibly a full millisecond or more ... and will then go low ... or 0 ... for parts of a millisecond 24 times ... then go high again for a relatively long period.
When you say "occasional", I am assuming that is a zero no more than once or twice a second, which I would attribute to noise.
Another test would be to add the highlighted line of code to the original program:
if (lastClock == 1 && clock == 0){
out = digitalRead(dataIn)+digitalRead(dataIn)+digitalRead(dataIn); // Tripple sampling to remove glitches
Serial.println(micros());
his will tell you how often the program detects a usable clock transition and therefore how often it is trying to read the information that is on the data line.
It should follow the patter presented earlier and is shown in the clock diagram at the top of ... http://www.instructables.com/id/Reading-...-Protocol/ ...
Arvid