Project

# Title Team Members TA Documents Sponsor
53 Ultrasound Remote Operated Vehicle
 Gabriel Inojosa
Jamil Yeung
Ted Josephson
 Kaiwen Cao design_document1.pdf
final_paper1.pdf
grading_sheet1.pdf
proposal1.pdf
# Ultrasound Remote Operated Vehicle

Team Members:
- Gabriel Inojosa (gvi2)
- Ted Josephson (tdj4)
- Jamil Yeung (jamilyy2)

# Problem

Submersible remote operated vehicles are often used for the inspection of underwater structures.The use of electromagnetics is predominant in most cases of wireless communication. However, electromagnetic waves of the frequencies typically used for communication in air and free space do not propagate well in water. As a result, submersible ROVs have been developed which communicate with the operator acoustically. However, these are very expensive.

# Solution

We intend to develop a proof of concept for a lower cost acoustically controlled ROV which operates in air, using cheap ultrasonic transducers designed for range finding.
We would like to develop a low-cost method of wireless communication using acoustics for remote control that will fit within the budget of ECE 445. For simplicity of the project, we will use the ECE 110 car as the mechanical basis of our design.

# Solution Components

## Subsystem 1: Transmitter Subsystem

A STM32H7B3RIT6 Microcontroller with a MA40S4S Piezoelectric transducer will be transmitting a modulated control signal using frequency shift keying (FSK) at a carrier frequency of 40 kHz. The packets will be sent using a sequence of data bits that will vary to provide various instructions to the vehicle.
The system will be connected to a laptop drawing 5V power over USB-C and will be communicating over UART using an FTDI FT231XS-R UART to USB converter for debugging purposes.

## Subsystem 2: Receiver Subsystem

Receive ADC on the STM32H7B3RIT6 microcontroller demodulates the output of the RX piezo from the carrier frequency. For debugging purposes, it will also use the FT231XS-R UART to USB converter in order to be read.


## Subsystem 3: Actuator system

A finite state machine will be used to set the vehicle to move forwards, backwards, and allow it to turn. This system will be driving an H bridge to control two DC motors to drive. It will be taking a 9V input from the battery. The STM32 will synchronously drive a MOSFET H-Bridge using a gate driver and a dead time circuit.

## Subsystem 4: Sensor system

Using Serial Peripheral Interface (SPI), the STM32 will communicate with voltage sensors to provide current and voltage readings from the 9V battery discharging on the moving car. Additional sensors (Temperature, etc). May also be included in the SPI bus if the time permits.

## Subsystem 5: Power subsystem

For the moving vehicle, a 9 volt battery will be providing power. This will be stepped down to 3.3 volts using a R-78E3.3-0.5 non-isolated buck DC-DC Converter in order to power the STM32 Microcontroller. 5V power from the USB port will be used for the transmitter board with reverse current protection. A low dropout linear voltage regulator will be used in both systems to keep the voltage at around 3.3V.

# Criterion For Success

Describe high-level goals that your project needs to achieve to be effective. These goals need to be clearly testable and not subjective.

The power system will draw from a 9V battery to power the microcontroller with 3.3V +- 0.1%

With a microphone and a spectrum analyzer, the transducers will send a modulated FSK signal within a carrier frequency close to 40kHz. Proof of FSK modulation will be provided using oscilloscope screenshots

Upon receiving the modulated signal, a print statement over UART will provide the demodulated instruction packet. Proof of FSK demodulation will be provided using oscilloscope screenshots

The actuator system will successfully turn the car motors forward, reverse, and turn.

The sensor system will be able to properly communicate with the microcontroller over SPI. A varying voltage source will be swept up to 9 volts to prove the measurements of the sensor. Print statements will be provided over UART.

The car with the sensor system will be able to transmit its measurements back to the controller that is remotely positioned. Print statements will be provided over UART

El Durazno Wind Turbine Project

Alexander Hardiek, Saanil Joshi, Ganpath Karl

El Durazno Wind Turbine Project

Featured Project

Partners: Alexander Hardiek (ahardi6), Saanil Joshi (stjoshi2), and Ganpath Karl (gkarl2)

Project Description: We have decided to innovate a low cost wind turbine to help the villagers of El Durazno in Guatemala access water from mountains, based on the pitch of Prof. Ann Witmer.

Problem: There is currently no water distribution system in place for the villagers to gain access to water. They have to travel my foot over larger distances on mountainous terrain to fetch water. For this reason, it would be better if water could be pumped to a containment tank closer to the village and hopefully distributed with the help of a gravity flow system.

There is an electrical grid system present, however, it is too expensive for the villagers to use. Therefore, we need a cheap renewable energy solution to the problem. Solar energy is not possible as the mountain does not receive enough solar energy to power a motor. Wind energy is a good alternative as the wind speeds and high and since it is a mountain, there is no hindrance to the wind flow.

Solution Overview: We are solving the power generation challenge created by a mismatch between the speed of the wind and the necessary rotational speed required to produce power by the turbine’s generator. We have access to several used car parts, allowing us to salvage or modify different induction motors and gears to make the system work.

We have two approaches we are taking. One method is converting the induction motor to a generator by removing the need of an initial battery input and using the magnetic field created by the magnets. The other method is to rewire the stator so the motor can spin at the necessary rpm.

Subsystems: Our system components are split into two categories: Mechanical and Electrical. All mechanical components came from a used Toyota car such as the wheel hub cap, serpentine belt, car body blade, wheel hub, torsion rod. These components help us covert wind energy into mechanical energy and are already built and ready. Meanwhile, the electrical components are available in the car such as the alternator (induction motor) and are designed by us such as the power electronics (AC/DC converters). We will use capacitors, diodes, relays, resistors and integrated circuits on our printed circuit boards to develop the power electronics. Our electrical components convert the mechanical energy in the turbine into electrical energy available to the residents.

Criterion for success: Our project will be successful when we can successfully convert the available wind energy from our meteorological data into electricity at a low cost from reusable parts available to the residents of El Durazno. In the future, their residents will prototype several versions of our turbine to pump water from the mountains.