watt3r/e-nose

An electronic nose built to measure how good or bad a smell is. Winner of DiamondHacks '21 Best High School Hack

E-Nose Project

This is my submission for the DiamondHacks 2021 hackathon.

Demo

Here is a link to the demo on YouTube.

Code

All code is provided and commented in the e-nose.ino file.

Hardware

• Pro Mini 3.3v ATMega 328p
• 3.3v Voltage regulator
• 0.96" I2C Yellow-Blue SSD1306 OLED
• SGP40 Gas Sensor
• DHT11 Temperature and Humidity Sensor
• Toggle Switch
• Generic LiPo Battery

Wiring

Pinouts

DHT 11 Pins	Arduino Pins
0 (Left)	2
1 (Middle)	3.3v
2 (Right)	GND

SGP40 Pins	Arduino Pins
VIN	RAW
3.3v	Empty
GND	GND
SCL	A5
SDA	A4

128x64 OLED Pins	Arduino Pins
GND	GND
VCC	RAW
SCL	A5
SDA	A4

Libraries used

For this project I used many helpful libraries, listed below.

SSD1306Ascii

Adafruit SGP40 Library

Adafruit DHT Sensor Library

Next Steps

V2 of the e-nose will be a custom PCB on raspberry pi zero with Machine Learning to detect smells.