/Designs/Tools/reflow2/DOC/calibration/plot.gp
0,0 → 1,17
set terminal png
set output "temperature.png"
 
set key under
set xlabel "ADC value [-]"
set ylabel "Temperature [°C]"
 
f(x)= k*x + q
fit f(x) "calibration_data.txt" using 2:1 via k,q
 
 
# from http://hw.cz/docs/mereni_teploty/mereni_teploty_1.html/
A=3.90802e-3
B=-5.802e-7
g(x)=(-A + sqrt(A*A - 4*B*(1.0 - 1.0*x*2350.0/1024.0/1000.0)))/2.0/B;
 
plot "calibration_data.txt" using 2:1 with points title "measured points", f(x) title "0.674201 * x - 294.35", g(x) title "original hw.cz"