Project
| # | Title | Team Members | TA | Documents | Sponsor |
|---|---|---|---|---|---|
| 8 | Budget Odor Detector |
David Lacayo Jeffrey Wong John Yan |
Chentai (Seven) Yuan | design_document2.pdf proposal4.pdf |
|
| # Odor Detector Team Members: - Jeffrey Wong (jwong19) - David Lacayo (dlacayo2) - John Yan (johnyan2) # Problem Roughly 20% of the general population has a bad sense of smell ([Link](https://www.ncbi.nlm.nih.gov/books/NBK567741/)). This makes it hard to pick up odors, which may indicate a larger issue like a leak that would cause damage to the house, or potentially put the owner of the home in danger. An odor detector will compensate for this issue, but they are expensive on the market, going upwards of $200. Additionally it is common to have to buy more than 1 device to sense more than 1 gas at a time as well, increasing the cost even more. ([Link](https://www.google.com/search?sca_esv=a2b652855d7b65ae&sca_upv=1&rlz=1C1ONGR_enUS1085US1085&q=bathroom+odor+detector&tbm=shop&source=lnms&fbs=AEQNm0Dwc9VijzN-JW-4YRo_w_BUQbKUrL1mkR3HAGvFJsTEU2yTeL61j6uh8rPucZu_asD8QQkcJ2ZCfmQyRJdbMVxfwLj5E_IXO-CVkXuakqtw-13zeocNWRU3YlReVPUwaBFs7zE1oDuVzgTEJzPqBr0ACU6aqrZtnZnlm3-LAMzrU0cFrQcLXC9jCL5Okk4OO1PSKoZMcVW2fOwruwAjjqCVDGXpSQ&ved=1t:200715&ictx=111&biw=958&bih=944&dpr=1)). # Solution Our solution is an innovation– we will make a budget odor detector with sensors that detect methane, H2S, NH3, and CO. We will have an LCD screen to show each gas’s ppm level. Also, if the readings cross a dangerous threshold, the screen will display a warning notification as well as output a warning alarm to alert the user. # Solution Components ## Microcontroller We will use the STM32xx as our main microcontroller to process data sent from the sensors, and to interface that data with the LCD screen to display that information. ## Sensors NH3: ([Link](https://www.digikey.com/en/products/detail/sparkfun-electronics/SEN-17053/13252162)) H2S: ([Link](https://www.digikey.com/en/products/detail/sparkfun-electronics/SEN-17052/13252248)) Methane: ([Link](https://www.digikey.com/en/products/detail/sparkfun-electronics/SEN-09404/6161754)) CO: ([Link](https://www.digikey.com/en/products/detail/sparkfun-electronics/SEN-09403/6163653)) ## LCD Screen, LEDs We will have an LED that illuminates when the device has low battery, and an LED that illuminates when the alarm is going off. We will have an LCD screen that displays the ppm levels of NH3, H2S, Methane, and CO in the room that the device is in. If the sensors detect a dangerous level of gas in the room, the LCD will automatically turn on and display a warning message to indicate this crossed threshold. ([Link](https://www.digikey.com/en/products/detail/newhaven-display-intl/NHD-0420CW-AB3/5022951?utm_adgroup=&utm_source=google&utm_medium=cpc&utm_campaign=PMax%20Shopping_Product_Medium%20ROAS%20Categories&utm_term=&utm_content=&utm_id=go_cmp-20223376311_adg-_ad-__dev-c_ext-_prd-5022951_sig-CjwKCAjwreW2BhBhEiwAavLwfG0TbDch5eYRKwQTaY1O_lBKy-WOhhoPX9u6xC7CX5-OeFdmQ0rW8RoCHpcQAvD_BwE&gad_source=4&gclid=CjwKCAjwreW2BhBhEiwAavLwfG0TbDch5eYRKwQTaY1O_lBKy-WOhhoPX9u6xC7CX5-OeFdmQ0rW8RoCHpcQAvD_BwE)) ## Alarm The device will have an alarm that goes off if the gas sensors’ ppm levels exceed their thresholds. This is to alert the owner of the device of potential danger stemming from these gasses. ([Link](https://www.digikey.com/en/products/detail/pui-audio-inc/AI-1223-TWT-3V-2-R/5011391)) ## Power supply The device will be powered by a 9V battery. This will ensure that enough power is delivered to each of our sensors, our STM chip, & our LCD screen. ([Link](https://www.digikey.com/en/products/detail/duracell-industrial-operations-inc/9V/21259959)) ## Power Switch / Monitor Power Switch There will be a switch to turn the whole device on/off, as well as one for turning the LCD monitor on/off to save power consumption. ## Device Enclosure All of the previous components will be contained inside of an enclosure (likely 3D printed) to protect hardware components. # Criterion For Success ## The detector will need to do the following actions: * Detect exceeding thresholds of the following gasses in compliance to OSHA or default alarm settings ([Link](https://www.indsci.com/en/blog/understanding-gas-detector-default-alarm-settings) for all): * NH3 (Ammonia) when it exceeds 25 ppm ([Link](https://ctigas.com/ammonia-gas-detection/#:~:text=Ammonia%20detectors%20located%20in%20refrigerated,levels%20is%200%2D100%20ppm.) [Link2](https://nj.gov/health/eoh/rtkweb/documents/fs/0084.pdf)). Tested by opening a container of household ammonia. * H2S (Hydrogen Sulfide) when it exceeds 20 ppm ([Link](https://www.osha.gov/hydrogen-sulfide/hazards)). Tested by opening a container of a rotten egg/food. * CH4 (Methane) when it exceeds 1000 ppm ([Link](https://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex9038/$file/729-2.pdf?OpenElement=#:~:text=The%20Occupational%20Safety%20and%20Health,1%2C000%20ppm%20(0.1%20percent).)). Tested by opening a container of natural gas. * CO (Carbon Monoxide) when it exceeds 50 ppm ([Link](https://www.osha.gov/sites/default/files/publications/carbonmonoxide-factsheet.pdf)). Tested by opening a container of gas from burnt substances/exhaust pipes. * Display the ppm of the gasses on the LCD display. * Upon exceeding the sensor thresholds, display a warning message on the LCD display. * Upon exceeding the sensor thresholds, it sounds a warning alarm. * Display LEDs showing low battery and when the warning alarm triggers. |
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