For the temperature control of the hatch will be controlled from the lighting of the lamp's coils are controlled through the width of the pulse signal. (PWM)
For controlling the temperature of the eggs will be under the control of the brightness of the lamp coil is controlled via Pulse Width Modulated (PWM).
For the control of the temperature of the incubator is the control of the light of the coil of light bulb is controlled through the width of the signal pulse. (PWM).