Source tutorial illustration; physical build photograph unverified · SchematikSource ↗

CAIBI ASSESSMENT

ESP32 Air Quality Monitor

CAIBI VERDICTBUILD IT

A small ESP32 instrument showing temperature, humidity, pressure and a comfort label on an OLED display.

See what the build involves Original source ↗

Build or buy?

Compare the documented build with the purchase reference.

Build it yourself

Known parts cost£30–£45Build total not establishedSensor and electronics; enclosure extra

Time: 25 minutes
Difficulty: 2/5
Physical processes: ESP32 · Measurement & testing

See build requirements →

Purchase reference

Buy price referencePrice not checkedNo priced alternative recorded

Check the source for the exact model, availability and what is included.

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Purchase comparison not yet priced

What the prices cover

Allowance for the source-specified ESP32, BME280 and SSD1306 OLED plus breadboard/jumper hardware.

Includes: ESP32 board; BME280 sensor; SSD1306 OLED; Basic wiring/breadboard.

Not included: Enclosure; Shipping; Cloud logging additions.

Build evidence recorded 4 Sep 2026. Currency conversions are approximate.

The published build uses a BME280 and OLED, so its sensing scope is narrower than products that measure PM2.5, CO2 or VOCs. A headline saving would overstate what the build replaces.

BUILD AT A GLANCE

Source view and main parts

Check the source ↗

Source tutorial illustration; physical build photograph unverified · Schematik ↗

PHYSICAL BUILD5 key parts or groups

No.	Source specification
01	ESP32 development board
02	BME280 temperature
03	SSD1306 128 × 64 I2C OLED display
04	Breadboard and jumper wires
05	USB power and flashing connection

Full source specifications

ESP32 development board
BME280 temperature, humidity and pressure sensor
SSD1306 128 × 64 I2C OLED display
Breadboard and jumper wires
USB power and flashing connection

TOOLS / PROCESSES2 involved

ESP32
Measurement & testing

The real-world work

YOU STILL HAVE TOThe real-world work

Place the sensor where heat and poor airflow do not bias the reading
Wire and power the I2C devices correctly
Check the displayed values against real room conditions
Design a ventilated enclosure that does not compromise the measurement

THE BUILD SEQUENCE

How it comes together

1Preparation

Wire the shared I2C bus
Connect both BME280 and OLED to GPIO21 SDA and GPIO22 SCL with 3.3 V power and common ground.
YOU
Place the sensor properly
Keep the BME280 away from the ESP32 regulator and display heat, and leave airflow around it. Physical placement directly affects the reading.
YOU

2Build and assembly

Flash the published firmware
Install the Adafruit display, graphics, BME280 and sensor libraries, then deploy the baseline sketch.
AI + YOU
Verify addresses and readings
Confirm the OLED and BME280 I2C addresses, then compare live values with expected room conditions and Serial Monitor output.
YOU

3Configure and test

Tune the comfort logic
Adjust the temperature and humidity thresholds for the room and climate. AI can help reshape the logic or add more informative states.
AI + YOU
Extend it if useful
Add Wi-Fi logging, an RGB status light, Home Assistant output or trend storage after the baseline sensor readings are stable.
AI + YOU

Benchmark this project

Use the ESP32 Air Quality Monitor prompt. Compare what different models deliver, then add what happened when you tried it.

Try this benchmark

View the project prompt

CAIBI adaptation · Prompt 1.0 · Project source

Prompt for ESP32 Air Quality Monitor

CAIBI project benchmark: ESP32 Air Quality Monitor
Prompt version 1.0

Help me build ESP32 Air Quality Monitor using the existing creator project at https://www.schematik.io/projects/build-an-esp32-air-quality-monitor. This is a CAIBI benchmark adaptation of the project build brief, not a claim about how the creator used AI.

Project context:
- A small ESP32 instrument showing temperature, humidity, pressure and a comfort label on an OLED display.
- Build context: ESP32 development board; BME280 temperature, humidity and pressure sensor; SSD1306 128 × 64 I2C OLED display; Breadboard and jumper wires; USB power and flashing connection.
- Where AI helps: Firmware changes, Threshold logic, Wi-Fi expansion, Troubleshooting.
- Physical work: Wire I2C bus, Place sensor correctly, Flash firmware, Verify readings, Build enclosure if wanted.
- Main limitation: Sensor placement affects the measurement. Putting the BME280 beside heat-producing electronics or sealing it in an unventilated enclosure undermines the result.

Read the source first. Use its published design, files, dimensions and parts as the baseline; do not redesign it unless a missing detail requires a clearly labelled proposal. If you cannot access a source or verify a revision, say so.

Provide one practical build package:
1. Design and files: explain the source design, link the original editable files, and identify missing files or modifications.
2. Parts and fabrication: give quantities, exact variants and compatibility, plus a cutting or printing list where applicable. Preserve source dimensions; flag anything unconfirmed.
3. UK and US purchasing: direct product links, checked dates, stock, pack sizes, taxes, delivery and regional costs. Mark unverifiable details as unknown; do not invent links, prices or availability.
4. Assembly: an ordered guide covering fabrication, fitting, wiring or software as applicable, setup, checks and troubleshooting.
5. Cost and time: separate parts, fabrication, delivery, hands-on time and machine time, with assumptions and exclusions.
6. Function and ease: a test plan for the project's stated purpose, likely difficulties, required skills and any corrections or limitations.

Keep source facts, your proposals and items needing physical verification distinct. An estimate is not a measured build result. Do not claim to have built or tested hardware. Include failed attempts and omissions. If a section does not apply, say why.

Use the source as accessed during this run and record its revision or access date. The prompt is fixed; the linked source can change.

Open and copy prompt →

Benchmark results 0

No reviewed results yet for ESP32 Air Quality Monitor. Add the first result →

AI IN THIS PROJECT

Get AI help on this build

CAIBI · AI CAN HELP

AI can help with

Firmware changes
Threshold logic
Wi-Fi expansion
Troubleshooting

CAIBI · AI CAN'T DO

You still need to

Place the sensor where heat and poor airflow do not bias the reading
Wire and power the I2C devices correctly
Check the displayed values against real room conditions
Design a ventilated enclosure that does not compromise the measurement

Original source AI use and prompts

SOURCEThe original project does not publish an AI prompt

The prompts below are CAIBI helpers for this build. They are not presented as instructions from the creator.

CAIBI STARTING PROMPTS

Copy a prompt for this build

Each prompt tells AI to keep the original project source as the reference and to flag anything you must verify on the real build.

Ways to take it further

AFTER THE FIRST BUILD

Ways to take it further

Wi-Fi dashboardHome Assistant integrationRGB comfort indicatorSD card loggingDifferent enclosure and sensor placement

More routes and resources

OTHER WAYS TO GET THERE

You do not have to follow one route.

ORIGINAL BUILDFollow the creator route

Use the published files and instructions as the baseline.

ALTERNATIVE PROJECTClawd Mochi

A small ESP32-C3 desk companion with animated faces, web controls and a published low-cost parts list.

REVIEWED RESOURCES

Useful places beyond the main source

DOCSAdafruit BME280 guide

Sensor reference covering wiring, addressing and measurement behaviour.

DOCSAdafruit SSD1306 library

Display library used for the OLED output and a useful reference when resolving blank-display or address issues.

SOURCE · CAIBI · BUILDERS

What supports the verdict

SOURCESchematik

Schematik guide published May 2026 and updated Jul 2026 with full wiring, firmware and troubleshooting

Open source ↗

CAIBIBUILD IT

It is a low-risk first sensor build with a useful result and obvious expansion routes into logging, Wi-Fi, automation and more visible indicators.

Evidence: Strong

BUILDERSNo published reports yet

Actual time, cost, changes and outcomes appear here after submitted builds are reviewed.

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HAVE YOU MADE THIS?

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First-hand evidence improves the assessment

What we want to know

What happened when you actually tried to make it.

Did it work?
Actual time and cost
What did you change?
What was harder than the source suggested?
Would you build it again?