Before starting the project, I have finalized what components that I will be used. So before going to purchased the components, I did some research about the components.
W1209 Temperature control switch:
The W1209 Temperature
control switch is a low cost but highly functional thermostat controller. It
uses thermostat as it main sensor to senses the temperature until certain
threshold is reach. The module can control most of the temperature sensing
based electrical device mainly because of the highly accuracy Negative
Temperature Coefficient (NTC) temperature sensor. NTC is a thermally sensitive
resistor sensor which its resistance shows an extensive, accurate and
predictable decrease as the core temperature of the sensor increases over the
working temperature range. It means that the sensor resistance will decreases
with increasing temperature.
It also has three tactile switches that use in configuring different
type of parameters which include the on and off trigger temperature. The on
board relay can switch up to a maximum of 240V AC at 5A or 14V DC at 10A. The
seven segment display is acting as the temperature display which displayed in
degree Celsius.