[seth22]

hi alan,

thanks for the information. today was cloudy, need to wait another day for calibration. is 0.3 ohm low enough for my cf cell? or can i use several low R resistor and take multiple results?

also, i'm using arduino uno that has 5V reference, how can i make the reference into 3.3V? if my cf is connected across 10R, the irradiance value is it simply the value from logger > convert into voltage and divide by 10R and correlate to the I-W/m2 reference?
thanks