Anti Collision Transmitter/Receiver

Course: ELECTENG 310

Year: 2021

Grade: A

Clients: Hella NZ - Nigel Greig

The project was to create a low-cost system integrated into vehicles that transmits and receives speed data using light signals to prevent rear ended collisions.

How?

The Transmitter, which is embedded in the brake lights of the front vehicle. It’s purpose is to take a 2-4V input signal representing speeds from 0-100kph and outputting a PWM wave, in which the duty cycle represents the input voltage.
The purpose of the receiver is to receive the speed signal encoded into the duty cycle from the vehicle ahead, and output the speed as a 2-4V DC signal for use in subsequent systems where 2V represents a speed of 0kph and 4V represents a speed of 100kph.
This project was a fully analogue system, where each section of the circuitry was calculated by hand and supported by LTSpice and laboratory oscilloscopes results.
Bread-boarded a working prototype (seen in the photo) and made PCB's using Altium Designer.

Results?

Obtained a response time of approximately 40ms, which is deemed fast when compared to the human response time (250ms).
An error of less than 5% with a separation distance of 100mm and input of 2V.
An error of less than 3.5% with a separation distance of 150mm and input of 4V.
Met all client requirements to a very high standard, whilst minimizing the cost.

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