Vehicle that Navigates by Audio

This project involves navigating a vehicle through a minefield by using audio beacons of fixed frequencies located throughout the field. The vehicle will start at a fixed location in the field. The mission is to locate the “next” audio beacon and steer the vehicle toward that beacon while monitoring for the next beacon. The vehicle should continue to search each consecutive beacon until the final beacon is located, indicating the vehicle has exited the minefield. During the journey, the vehicle may not collide with any of the beacons and must steer clear. Vehicle Details: The vehicle consists of an aluminum chassis with three wheels (one front center wheel, two rear wheels). Each rear wheel has a dedicated DC motor used to motivate each wheel independently. Both DC motors are connected to a PWM motor driver unit that controls the RPM of each motor independently based on a 2 PWM signals. The details of the PWM motor driver are included in the appendix. Microcontroller: Teensy 3.2 Real Time processor: This microcontroller will interface the PWM motor drivers on the vehicle and the microphone sensor (and any other sensor you may include). Plan to power the vehicle separately from the microcontroller. A four bank AA battery pack is sufficient for the vehicle, while a separate power source may be used for the controller. Do not power the motors through the microcontroller; it is not capable of providing sufficient current. Battery packs may be purchased from [login to view URL] or adafruit.com. Sensor Details: The microphone/amplifier assembly is described below. [login to view URL] Beacon Information: Each beacon is a piezo buzzer tuned to a particular frequency. Details of the buzzer are below: [login to view URL] Rules: 1. You may use preassembled libraries for PWM signal generation and audio processing. 2. One group will be tested at a time. The vehicle will be placed at the starting point, and the beacons will be turned on. There should be a “Go” button on the vehicle to start the journey to the finish line as well as a visual indication (LED) that the journey has ended