Circuit to determine the humidity is a comparator, which detects the temperature change is very small in relation to the ambient temperature environment.
Circuit electronics to determine the humidity of the room
Parts:
R1_____________22K Linear Potentiometer (See Notes)
R2_____________15K @ 20°C n.t.c. Thermistor (See Notes)
R3_____________10K 1/4W Resistor
R4,R5,R7,R9____22K 1/4W Resistors
R6____________220K 1/4W Resistor
R8______________5K 1/2W Trimmer Cermet
R10___________680R 1/4W Resistor
C1_____________47µF 63V Electrolytic Capacitor
D1_____________5mm. Red LED
D2_____________5mm. Green LED
IC1___________TL061 Low current BIFET Op-Amp
IC2___________LM393 Dual Voltage Comparator IC
P1_____________SPST Pushbutton
B1_______________9V PP3 Battery
