Project

# Title Team Members TA Documents Sponsor
5 Bicycle Lighting System
 Jack Nelson
Quentin Mooney
Sloan Abrams
 Sanjana Pingali design_document1.pdf
proposal2.pdf
proposal1.pdf
# Project: Bicycle Lighting System
## Team:
Quentin Mooney (qmooney2)

Jack Nelson (jnels9)

Sloan Abrams (sloanaa2)

## Problem:
We are all cyclists, and feel road safety would be improved significantly by a robust lighting system to communicate with other cars, bikes, and pedestrians. Hand signals work decently well, but not everyone is confident enough on a bike to take a hand off their handlebars while riding. Hand signals are also significantly less effective at night when visibility is lower.

## Solution:
We want to design a control system for a bicycle lighting system. Headlights and taillights are already widely used, and in a lot of places required by law. We would like to expand upon that by adding brake lights that make the taillights brighter when the brakes are engaged, as well as turn signals so cyclists can signal their intended changes in directions more easily.

# Solution Components

## Brake System:
- Brake taillights that are automatically activated when the brakes are engaged. We plan to use the ALS31313 Hall Sensor in conjunction with a magnet on either the brake lever or brake calipers to sense brake engagement and trigger the brake lights

## Turn Signal System:
- Turn indicator lights on the front and rear of the bicycle
- Easy to use and access buttons or switches for the rider to turn on their signals
- Turn indicators automatically turn off after turn is complete (the same way a car's will). We will use an Inertial Measurement Unit ICM-42670-P for sensing when the turning action is completed .

## User controls/Interfacing
- The rider can see if their turn signals are on or off. This will either be accomplished by a small light indicator on the handlebars, or the turn indicators on the front of the bicycle will be positioned in such a way as to be visible to the rider.
- On/Off controls for the entire lighting system.

## General System
- Hazard lights (both turn indicators simultaneously) that can be turned on and off by the rider.
- Front headlights for visibility to other road users.
- On/Off controls for the entire lighting system.

## Power System
- Battery powered.
- Batteries are easy to remove and replace.

## Additional Stretch Goals/Possibilities:
- Ability to control brightness of lights / power conservation mode /brights.
- Bluetooth/wireless system.
- Rechargeable battery (super stretch goal: Dynamo powered).
- 'Auto' mode for the lights (automatic daylight sensing).
- Automatically turn off whole system if bike has been inactive for 15+ min and lights were accidently left on. Using IMU sensor for motion detection.


# Criterion for Success:
- Rear brake lights activate when brakes are engaged.
- Turn signals turn on when activated by the rider, and automatically turn off after the turn is complete (for turns of 90 degrees or sharper.)
- Headlights on bike. They are bright enough to be seen at night from at least 25 yards away.
- Rear taillight is always on when system is on.
- Entire system can be turned on and off by the rider.

Musical Hand

Ramsey Foote, Thomas MacDonald, Michelle Zhang

Musical Hand

Featured Project

# Musical Hand

Team Members:

- Ramesey Foote (rgfoote2)

- Michelle Zhang (mz32)

- Thomas MacDonald (tcm5)

# Problem

Musical instruments come in all shapes and sizes; however, transporting instruments often involves bulky and heavy cases. Not only can transporting instruments be a hassle, but the initial purchase and maintenance of an instrument can be very expensive. We would like to solve this problem by creating an instrument that is lightweight, compact, and low maintenance.

# Solution

Our project involves a wearable system on the chest and both hands. The left hand will be used to dictate the pitches of three “strings” using relative angles between the palm and fingers. For example, from a flat horizontal hand a small dip in one finger is associated with a low frequency. A greater dip corresponds to a higher frequency pitch. The right hand will modulate the generated sound by adding effects such as vibrato through lateral motion. Finally, the brains of the project will be the central unit, a wearable, chest-mounted subsystem responsible for the audio synthesis and output.

Our solution would provide an instrument that is lightweight and easy to transport. We will be utilizing accelerometers instead of flex sensors to limit wear and tear, which would solve the issue of expensive maintenance typical of more physical synthesis methods.

# Solution Components

The overall solution has three subsystems; a right hand, left hand, and a central unit.

## Subsystem 1 - Left Hand

The left hand subsystem will use four digital accelerometers total: three on the fingers and one on the back of the hand. These sensors will be used to determine the angle between the back of the hand and each of the three fingers (ring, middle, and index) being used for synthesis. Each angle will correspond to an analog signal for pitch with a low frequency corresponding to a completely straight finger and a high frequency corresponding to a completely bent finger. To filter out AC noise, bypass capacitors and possibly resistors will be used when sending the accelerometer signals to the central unit.

## Subsystem 2 - Right Hand

The right subsystem will use one accelerometer to determine the broad movement of the hand. This information will be used to determine how much of a vibrato there is in the output sound. This system will need the accelerometer, bypass capacitors (.1uF), and possibly some resistors if they are needed for the communication scheme used (SPI or I2C).

## Subsystem 3 - Central Unit

The central subsystem utilizes data from the gloves to determine and generate the correct audio. To do this, two microcontrollers from the STM32F3 series will be used. The left and right hand subunits will be connected to the central unit through cabling. One of the microcontrollers will receive information from the sensors on both gloves and use it to calculate the correct frequencies. The other microcontroller uses these frequencies to generate the actual audio. The use of two separate microcontrollers allows for the logic to take longer, accounting for slower human response time, while meeting needs for quicker audio updates. At the output, there will be a second order multiple feedback filter. This will get rid of any switching noise while also allowing us to set a gain. This will be done using an LM358 Op amp along with the necessary resistors and capacitors to generate the filter and gain. This output will then go to an audio jack that will go to a speaker. In addition, bypass capacitors, pull up resistors, pull down resistors, and the necessary programming circuits will be implemented on this board.

# Criterion For Success

The minimum viable product will consist of two wearable gloves and a central unit that will be connected together via cords. The user will be able to adjust three separate notes that will be played simultaneously using the left hand, and will be able to apply a sound effect using the right hand. The output audio should be able to be heard audibly from a speaker.

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