Opt('ExpandVarStrings',1)
$hdll = DllOpen("K8055D.dll");
DllCall($hdll,"int","OpenDevice","int",0);
$rac = DllCall($hdll,"int","ReadAnalogChannel","int",1)

; the interesting part starts here
$a1_value = $rac[0] ; Value optained from call to ReadAnalogChannel
$a1_max = 255
$Vin = 5.06; 5V from A2 (5.06 says multimeter)
$Vout = $Vin / $a1_max * $a1_value ; = 1.012 (multimeter says 1.028)
$r1 = 3300; 3.3 kOhm - the 'known' resistor, and its correct (says mr multimeter)
$r2 = $r1 / (($Vin/$Vout) -1) ; = 825 but multimeter says 1083

; 1083 Ohm = 21.3 °C, probably correct
; 1000 Ohm = 0 °C, for reference...
; 825 Ohm = below 0 °C, and i'm not freezing...

; output stuff...
ConsoleWrite("a1_value = $a1_value$, Vout = $Vout$, r2 = $r2$" & @CRLF)