void setup() {
Serial.begin(9600);
int Re = analogRead(A0);
char buf[20];
dtostre(Re, buf, 3, 0);
Serial.print(buf);
}
void loop() {
}
and I got when reading the 3.3V signal from the board
7.060e+02
706 is not 3.3. This may be my problem, but I'm not sure how to fix. EDIT: I know how to do the conversion from analogRead to an actual voltage now. Shoulda done some quick googling first. This'll probably fix my problems.
In response to the other post, I understand the five volt read limit and I will use a voltage divider and multiply the read voltage by two (I think I said that in an earlier post). The two-point calibration is I believe worked into the conversion expression, as I said earlier. In the documentation after it gives this conversion expression p=10^(1.667V-11.46) it specifies a range of 3.8e-9<p<750 torr. Again, the actual mechanical calibration of the gauge is a far more important issue to determine it's accuracy. I probably will calibrate at low vacuum against a brand-new thermocouple gauge and match the readings using the calibration screw on the gauge head. This will allow me to find that "b" you mentioned. The "m" is probably a non-issue, and if it becomes one I may as well just by a new gauge as it probably is corrupted in some way.