It displayed an error message “No unused FET found”. Tis was a great risk as it meant that the code cannot execute until it is connected to the LED lighting system. Tis demanded a configuration of the LED display system to the computer as an interface. Te configuration is a risk considering the conflict between the launch pad and other hardware components that require the computer. Te Energia Launch pad gives a conversion from analog to digital to generate a digital value. Wth the RC filters, w generate signals (PWM).
Te Launchpad provides the functionality by using a function analogWrite (). Tis project easily converts the PWM output signal to an analog voltage, gving the actual DAC. I simply uses the simple RC low-pass filtering component designed from a resistor and a capacitor as shown in figure 9 below. Te RC low-pass filter does the conversion of the PWM signal to the required voltage for the duty cycle. Acording to Ray & Bhurchand (2003), te optimal PWM values for this project include R (3. 9Ω and C Wth the understanding of the role of PWM in changing the frequency, tis project implements a frequency modulation using an RC low-pass filter.
I is a simple circuit that convert the PWM digital output into analogue output signal, wich is proportional to the sizes of the PWM waveforms. Tis will provide a full D-A converter for the Energia Launch pad microcontroller (Krishna, 2007). Fr the conversion of the digital input signal to analogue signals, tere is a variation of the frequency and amplitude of the signal. Acording to et (2007), wen data communication through pulses is introduced, te modulation can be done on the frequency, te amplitude or the pulse width.
Fgure 9 below shows the modulated digital signals. Trough an online oscillator, w produce the transient analysis graph showing the ripples. I also shows the behavior of voltage against the PWM values between 40 and 200. Tble 3 below presents the data output for the voltage against the input. ..
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