Project

# Title Team Members TA Documents Sponsor
11 AUTOMATIC HUMIDITY SENSING AND WATER REFILLING COOL-MIST HUMIDIFIER
 Andrew Sherwin
Jalen Chen
Woojin Kim
 Surya Vasanth design_document3.pdf
final_paper3.pdf
photo1.PNG
photo2.jpg
presentation1.pdf
proposal2.pdf
video
video
# Team Members:
- Woojin Kim (wkim51)
- Andrew Sherwin (zyxie2)
- Jalen Chen (jalenc3)

# Problem

The problem we want to solve is the lack of humidity in indoor environments, especially during the winter months. Humidity levels are often very troublesome to control, having to continuously modify the humidifier output level to fit your perfect needs. You would have to keep adding water in the humidifier every time it runs out. Bacteria, minerals, and mold tend to form over time in the water tanks. Ultrasonic humidifiers will vibrate these particles into the air, and are detrimental to the user’s health. Hot-mist type humidifiers also tend to congest nasal passages, as well as high energy costs. The cost-must humidifier works by evaporating water using a fan. This is the safest, and cleanest way to humidify a room, therefore, is the method we will be using.


# Solution

To resolve the problem brought up, we have decided to produce an automatic humidity detecting humidifier. The idea is the humidifier will know when to turn on and off depending on the readings of a humidity sensor. The humidity sensor will be placed in a location away from the humidifier. This will prevent false readings from being in a close proximity to the humidifier. Every few minutes, the humidifier will communicate with the sensor before deciding to turn on or off.

Update: 01/25/2024 15:10 - We will incorporate multiple sensors to detect multiple humidity readings in a room. We may average the readings for the humidity range, and the different readings will tell the humidifier which direction needs more humidifying.


# Solution Components

## Subsystem 1
## Humidity Sensor

Explain what the subsystem does. Explicitly list what sensors/components you will use in this subsystem. Include part numbers.
The humidifier will have a ESP32 chip that communicates with the remote ESP32 chip which is connected to a BME280 sensor. The BME280 sensor is able to communicate with I2C and SPI. We will use SPI for communication with the ESP32 microcontroller, with the ESP32 being the master. The ESP32 in the humidifier will be the master. We plan to use the ESP32 in the humidifier to bring up a WiFi connection, as the host, and the remote ESP32 will join the host’s connection for communication. The ESP32 will be powered via a barrel jack and an AC to DC converter.

2x ESP32-S3-WROOM
https://www.digikey.com/en/products/detail/espressif-systems/ESP32-S3-WROOM-1-N16R2/16162644

1x Temperature/Humidity SensorBME280
https://www.digikey.com/en/products/detail/bosch-sensortec/BME280/6136306

1x AC/DC barrel jack plug
https://www.digikey.com/en/products/detail/tri-mag-llc/L6R12-090/7682630



## Subsystem 2
## Humidifier

The humidifier will have a round base, similar to that of a mug. Inside the enclosure will be a filter. The filter will be wet, as water is fed in from the base of the enclosure. Above the wet filter will be a quiet fan that accelerates the evaporation of the wet filter. There will be a water level sensor at the base of the humidifier to sense when more water needs to be added. When an insufficient amount of water is detected, the ESP32 in the humidifier will tell the water dispensing system, discussed with the machine shop, to activate and trickle fill the base of the container. It will stop when the water detector determines there is enough water. The fan will activate, continue activating, or turn off depending on the data from the remote ESP32. The idea is to have an electronic valve that turns on and off the water supply. For the demo, the water supply will be from a tank, but the product should be connected to a building's water supply. The PCB will be connected to the wall via a barrel jack to an AC to DC converter.

Update: 01/25/2024 15:10 - The humidifier will have a rotating head or body that can adjust the wind flow direction of the fans depending one which area in the room needs more humidity.

1x Humidifier Filter
https://www.amazon.com/Lxiyu-Humidifier-Wicking-Compatible-Replacement/dp/B088WG2QF8/ref=sr_1_2_sspa?crid=1CIMXRNSVCXBJ&keywords=humidifier+wicking+filter&qid=1706162957&sprefix=humidifier+wicking+filt%2Caps%2C122&sr=8-2-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1

1x irrigation pipe
https://www.amazon.com/ZZM-360%C2%B0Tree-Watering-Sprinkler-Irrigation/dp/B0B5GW28YC/ref=asc_df_B0B5GW28YC/?tag=hyprod-20&linkCode=df0&hvadid=647314406102&hvpos=&hvnetw=g&hvrand=2915494740902510298&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9022185&hvtargid=pla-1954342074615&psc=1&mcid=5423b99a7bef38d4b629f5773e55ffc2

1x water resistant quiet fan
https://www.amazon.com/Coolerguys-120MM-120X120X25-Airflow-Waterproof/dp/B07NMC9X38/ref=sxin_14_pa_sp_search_thematic_sspa?content-id=amzn1.sym.97527784-1102-40e6-925d-b95bb0c9f9e6%3Aamzn1.sym.97527784-1102-40e6-925d-b95bb0c9f9e6&crid=2LYEA1XUQ1U02&cv_ct_cx=waterproof%2Bfan&keywords=waterproof%2Bfan&pd_rd_i=B07NMC9X38&pd_rd_r=2552965a-ddcc-4837-b12f-840f4493f7c6&pd_rd_w=dupGO&pd_rd_wg=MdZFw&pf_rd_p=97527784-1102-40e6-925d-b95bb0c9f9e6&pf_rd_r=GRHM9G2MGXFZES6APX0B&qid=1706164051&s=lawn-garden&sbo=RZvfv%2F%2FHxDF%2BO5021pAnSA%3D%3D&sprefix=waterproof%2Bfan%2Clawngarden%2C139&sr=1-1-364cf978-ce2a-480a-9bb0-bdb96faa0f61-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9zZWFyY2hfdGhlbWF0aWM&th=1

1x contactless water level detector
https://shop.pimoroni.com/products/contactless-water-level-sensor-module?variant=40162797322323

1x AC/DC barrel jack plug
https://www.digikey.com/en/products/detail/tri-mag-llc/L6R12-090/7682630


# Criterion For Success

- Our project would need to achieve a multitude of high-level goals to be sufficiently complete. Some goals would include:
- ESP32 is able to read data from the humidity sensor
- ESP32 is able to communicate with ESP32 in the humidifier
- Multiple ESP32 sensor PCBs communicating with humidifier PCB for multiple humidity readings
- Humidifier’s fan is able to turn on and off based on a humidity range
- Humidifier is able to rotate and adjust its wind direction to a direction that needs more humidity
- The filter irrigation system irrigates the filter when the water level sensor readings indicate more water is needed


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Updated: 01/25/2024 15:10 - Added multiple sensors and rotating humidifier

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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