There is a ON & OFF blinking of the LED light in a traffic light which is being controlled by the switching function below: LED Switch ON time:One second at a repeated time. LED Switch off time:Three...

There is a ON & OFF blinking of the LED light in a traffic light which is being controlled by the  switching function below:
LED Switch ON time:One second at a repeated time.
LED Switch off time:Three seconds between the ON times.
a. Make a sketch of the signal & an expression for the blinking operation.
b. Determine the Fourier coefficient i.e frequency spectra of the signal

c.At time t=1,amplitude= -1,     At time t=0.5,amplitude= IV,   At t=-0.5,amplitude=IV, &    At time t=-1,amplitude=-IV.
Above is the characteristics of a voltage signal which has unity amplitude & width from a  Temperature Sensor. Make a sketch of the waveform & determine the Fourier coefficients of the signal.