The Pelican Crossing - Engineering Assignment Help

Assignment Task

Introduction
The Pelican Crossing is a signalised crossing used on public highways and incorporates audio equipment to generate audio tones to assist visually impaired pedestrians to cross safely. At single carriageway crossing sites, a ‘single bleep’ audio signal is generated whereas at a ‘staggered crossing facility’ a ‘bleep and sweep’ audio signal is generated. Both types of audio signal are generated when the green man, safe to cross, is displayed.
In addition to the audio signal, when the pedestrian ‘push to cross’ button is pressed, digital electronic equipment generates the correct traffic lights sequence.

Specifications
Traffic Lights
The normal traffic lights sequence will be displayed using appropriate coloured LEDs.

Audio Signal
The fundamental frequency of the ‘single bleep’ tone can be between 2.0 kHz and 3.5 kHz with a mark space ratio of 1.5:1 ± 10%. Whereas the main clock pulsed are at 240 ± 10 pulses per minute.
The audio signal will be fed into an external audio amplifier. Figure 1 shows the block diagram for the Pelican Crossing system

You are required to design, simulate and build the digital electronic circuits that make up the complete system except for the audio amplifier which will be provided to test the system. 

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