Best Temperature & Humidity Sensor for ESP32: SHT45 vs BME280 vs AHT20 vs DHT22

Quick Summary (TL;DR):
If the project is specifically about measuring temperature and relative humidity as accurately as possible, the SHT45 is the clear winner: Sensirion specifies approximately ±1.0% RH and ±0.1°C typical accuracy, very low long-term drift, a fast digital I²C interface and an integrated heater for condensation recovery. The BME280 is the best all-round environmental sensor when barometric pressure matters; it adds a real pressure sensor, but humidity accuracy is around ±3% RH and Bosch explicitly notes that its internal temperature reading can sit above true ambient temperature because of PCB/sensor self-heating. The AHT20 is the best budget modern choice: roughly ±2% RH and ±0.3°C typical accuracy, standard I²C and very low cost. The DHT22/AM2302 still works, but its custom single-wire timing, slow physical response, minimum two-second read interval and ageing design make it the least attractive choice for a new ESP32/Home Assistant build. For most readers: SHT45 for best measurements, BME280 for weather/pressure, AHT20 for best value, DHT22 only when you already own one or need to maintain an existing project.

Materials You’ll Need

Item	Why you need it
ESP32 development board	Any ESP32 with suitable GPIO/I²C support
SHT45 breakout	High-accuracy temperature + humidity option
BME280 breakout	Temperature + humidity + barometric pressure
AHT20 breakout	Low-cost modern I²C temperature/humidity sensor
DHT22 / AM2302	Legacy single-wire comparison / existing projects
Dupont wires	Sensor connections
Breadboard	Quick prototyping
4.7 kΩ resistor	Useful pull-up for bare DHT22 DATA line
Ventilated enclosure	Reduces thermal and airflow measurement errors
Home Assistant + ESPHome	Local logging, dashboards and automations

For a new build you do not need to buy all four sensors. The table is mainly there to make the comparison concrete. If accuracy is the priority, start with an SHT45. If pressure is required, buy a genuine BME280. If cost is the priority, AHT20 is usually a more sensible modern purchase than DHT22.

The Four Sensors at a Glance

Feature	SHT45	BME280	AHT20	DHT22 / AM2302
Temperature	Yes	Yes	Yes	Yes
Humidity	Yes	Yes	Yes	Yes
Pressure	No	Yes	No	No
Typical temperature accuracy	±0.1°C	±0.5°C (0–65°C)	±0.3°C	±0.5°C
Typical humidity accuracy	±1.0% RH	±3% RH	±2% RH	±2% RH typical; worse at extremes
Humidity response τ63%	~4 s	~1 s	~8 s	~10 s class
Interface	I²C	I²C / SPI	I²C	Custom single-wire
Typical I²C address	0x44	0x76 or 0x77	0x38	N/A
Integrated heater	Yes	No	No	No
ESPHome support	Excellent	Excellent	Excellent	Excellent
Best use	Accurate room/HVAC sensor	Weather + pressure	Budget modern sensor	Legacy/very cheap projects

Which One Should You Buy?

Project	Best choice	Why
Best possible room temperature/humidity	SHT45	Best published RH and temperature accuracy of these four
Home Assistant room sensor	SHT45	Stable, accurate, easy ESPHome integration
Weather station	BME280	Adds barometric pressure
Outdoor weather station where humidity quality matters most	SHT45 + separate pressure sensor	Better RH/T accuracy while retaining pressure via separate sensor
Budget indoor sensor	AHT20	Modern I²C and strong accuracy for little money
Bathroom / condensation-prone location	SHT45	Integrated heater can assist recovery from condensation
Battery environmental node	SHT45 or BME280	Both sensors themselves are extremely low power
Existing old project	DHT22	No reason to redesign if it already works
New project choosing between AHT20 and DHT22	AHT20	Better interface and generally better overall design

SHT45: The Accuracy Winner

The SHT45 is the highest-accuracy member of Sensirion’s standard SHT4x family. It measures only two things — temperature and relative humidity — but it does both very well.

SHT45 specification	Value
Typical humidity accuracy	±1.0% RH
Typical temperature accuracy	±0.1°C
Humidity range	0–100% RH
Temperature range	-40 to +125°C
Humidity response τ63%	~4 s
Temperature response τ63%	~2 s
Typical RH long-term drift	<0.2% RH/year
Interface	I²C
Default address	0x44
Supply	1.08–3.6 V at chip level
Heater	Integrated

For normal indoor conditions, the difference between ±1% RH and ±3% RH is meaningful if you care about comparing rooms, controlling HVAC, logging environmental conditions or setting relatively tight humidity thresholds.

It is also a very clean sensor for Home Assistant because there is little ambiguity about what it is for. There is no gas algorithm, no barometric compensation and no analogue calibration. The ESP32 sends an I²C command and receives factory-calibrated digital temperature and humidity.

Why SHT45 Is Better Than SHT40/SHT41 When Accuracy Matters

The broader SHT4x family is excellent, but the SHT45 is the genuinely higher-accuracy part. SHT40/SHT41 are around ±1.8% RH and ±0.2°C typical; SHT45 tightens that to approximately ±1.0% RH and ±0.1°C.

For a bathroom fan that switches at 70% RH, an SHT40 is already good enough. For a high-quality climate logger or a reference sensor used to compare other nodes, the SHT45 upgrade makes more sense.

The SHT45 Heater Is Not a Room Heater

SHT4x devices contain a small on-chip heater. Its purpose is mainly condensation removal, decontamination and recovery. It should not be left on continuously while pretending to measure ambient humidity, because heating the sensing element changes the local temperature and therefore the relative-humidity reading.

ESPHome exposes heater power, duration and maximum duty-cycle controls. A sensible installation normally leaves the heater off and uses it only where condensation recovery is genuinely needed.

Best SHT45 Uses

Home Assistant room climate sensors
HVAC control and monitoring
Bathrooms and high-humidity rooms
Greenhouses
Indoor environmental logging
Calibration/reference comparisons between hobby sensors
Battery temperature/humidity nodes
Higher-quality outdoor stations when correctly shielded

BME280: The Best All-Round Weather Sensor

The BME280 remains one of the most useful ESP32 environmental sensors because it measures temperature, humidity and barometric pressure in one tiny device.

BME280 specification	Value
Temperature accuracy	±0.5°C from 0–65°C
Humidity accuracy	±3% RH at 25°C / 20–80% RH
Humidity response τ63%	~1 s
Pressure range	300–1100 hPa full-accuracy range
Pressure absolute accuracy	About ±1 hPa from 0–65°C
Pressure relative accuracy	About ±0.12 hPa under specified conditions
Interface	I²C or SPI
I²C addresses	0x76 or 0x77
Sleep current	~0.1 µA
T+H+P average current at 1 Hz	~3.6 µA

The pressure channel is the reason to buy it. Neither SHT45, AHT20 nor DHT22 can tell Home Assistant that atmospheric pressure is 1008 hPa and falling.

BME280 Temperature Is Not a Perfect Ambient Thermometer

Bosch explicitly describes the BME280 temperature sensor as part of the compensation system for pressure and humidity. The datasheet notes that its measured temperature depends on PCB temperature and sensor self-heating and is typically above true ambient temperature.

This is not a defect. It is a reminder that a BME280 soldered close to an ESP32 regulator, USB chip or warm enclosure wall may report a temperature that is slightly too high — and because relative humidity depends strongly on temperature, that thermal bias can also make the RH reading look lower than expected.

BME280 vs BMP280: Check What You Actually Bought

One of the most common marketplace problems is a board advertised as “BME280” that is actually populated with a BMP280. The BMP280 measures pressure and temperature but does not contain a humidity sensor.

BME280 = Temperature + Humidity + Pressure
BMP280 = Temperature + Pressure only

If ESPHome detects a BMP280 or humidity is missing, the problem may be the hardware rather than the configuration. Buying from a reputable supplier matters more for BME280 than the tiny price difference between anonymous modules.

When BME280 Beats SHT45

If the application needs pressure, the BME280 wins by default because SHT45 does not measure it.

For a weather station, pressure is often just as useful as humidity. A BME280 gives a complete three-variable environmental package with one I²C device.

When SHT45 Beats BME280

If the application is primarily a room climate sensor, SHT45 is the better measuring instrument: about ±1% RH vs ±3% RH and ±0.1°C vs ±0.5°C typical temperature accuracy.

The high-end solution is not necessarily choosing one sensor. It can be:

SHT45 → accurate temperature + humidity
separate pressure sensor → barometric pressure

That costs more and uses another I²C address, but it avoids compromising temperature/humidity quality just because pressure is also required.

AHT20: The Best Budget Modern Option

AHT20 is easy to underestimate because it is inexpensive. Its typical specifications are strong enough for most Home Assistant rooms: ±2% RH and ±0.3°C.

AHT20 specification	Value
Humidity accuracy	±2% RH typical
Temperature accuracy	±0.3°C typical
Humidity response τ63%	~8 s
Temperature response	~5–30 s depending on conditions
Humidity range	0–100% RH
Temperature range	-40 to +85°C
Interface	I²C
I²C address	0x38 fixed
Typical role	Low-cost indoor temperature/humidity sensor

That puts AHT20 in an interesting position. It is less accurate than SHT45 but generally more attractive than DHT22 for a new design because it uses a normal I²C bus and offers better typical temperature accuracy.

AHT20’s Biggest Limitation: Fixed I²C Address

AHT20 normally uses the fixed I²C address 0x38. That means you cannot place several AHT20 sensors on one I²C bus simply by changing addresses.

If you need multiple AHT20s on the same ESP32, use separate I²C buses where supported or an I²C multiplexer such as TCA9548A.

SHT45 has a similar one-address limitation in ordinary modules (0x44), while BME280 is slightly more flexible because it can normally be selected as 0x76 or 0x77.

Why AHT20 Is Better Than DHT22 for Most New Builds

Standard I²C interface
Better typical temperature accuracy
No timing-critical custom single-wire protocol
Easy ESPHome configuration
Low module cost
Compact breakout boards

If the only reason to choose DHT22 is “it is cheap,” check AHT20 pricing first. The difference is often too small to justify building a new project around the older DHT protocol.

DHT22 / AM2302: Still Usable, but Now a Legacy Choice

DHT22 was a major upgrade over DHT11 and helped make DIY environmental sensing popular. It still works perfectly well for basic comfort monitoring, but its design shows its age.

DHT22 specification	Typical value
Humidity range	0–100% RH
Humidity accuracy	~±2% RH at room conditions; maximum error can be larger
Temperature range	-40 to +80°C
Temperature accuracy	~±0.5°C
Resolution	0.1% RH / 0.1°C
Minimum sampling interval	2 seconds
Interface	Custom single-wire digital protocol
Pull-up	~4.7–5.1 kΩ typical for bare sensor
Physical RH response	Slow compared with modern I²C sensors

The key detail is that sampling interval and physical response time are not the same thing. The DHT22 may allow a new digital read every two seconds, but the humidity sensing element itself can take much longer to settle after a real environmental change.

Why DHT22 Can Be More Frustrating on ESP32

Its protocol uses precise pulse timing on one GPIO. ESPHome handles that complexity for you, but wiring quality, pull-up value, long cables, board timing and sensor clones can still produce invalid readings.

ESPHome’s current DHT documentation recommends a roughly 4.7 kΩ pull-up when needed and defaults to a 60-second update interval. That is perfectly adequate for room climate monitoring; reading every two seconds adds little value to Home Assistant.

When DHT22 Still Makes Sense

You already own several and they work
You are maintaining an existing design
A tutorial or PCB is already built around DHT22
Absolute lowest purchase cost matters more than interface elegance

For a brand-new 2026 project, I would normally choose AHT20 instead at the budget end, or SHT45 when measurement quality matters.

Accuracy: What the Numbers Really Mean

A sensor specified at ±1% RH does not mean every reading will always differ from a ±3% sensor by exactly two percentage points. Accuracy specifications describe an error envelope under stated conditions.

True room humidity: 50% RH

SHT45 typical tolerance: roughly 49–51% RH
BME280 published tolerance: roughly 47–53% RH
AHT20 typical tolerance: roughly 48–52% RH

Individual sensors can perform better than their limit. The value of the tighter specification is that you have a stronger reason to trust the number without hand-calibrating every unit.

Typical Accuracy vs Maximum Accuracy

Do not compare one manufacturer’s “typical” figure with another manufacturer’s worst-case limit as if they were identical concepts. SHT45, for example, has detailed accuracy maps across temperature and humidity; DHT22 clone listings often quote only a headline room-temperature figure.

For hobby/Home Assistant use, the practical ranking remains robust: SHT45 first, AHT20 second, BME280 third for pure RH accuracy, DHT22 last overall — but BME280 becomes the winner whenever pressure is a requirement.

Response Time: BME280 Is Surprisingly Fast

Sensor	Humidity τ63% / practical response	Important note
SHT45	~4 s	Fast enough for HVAC and bathroom trends
BME280	~1 s	Very fast humidity element when exposed to airflow
AHT20	~8 s	Still easily fast enough for room monitoring
DHT22	~10 s class	Digital read interval can be 2 s, but physical sensor response is slower

A fast sensor does not help if it is sealed inside a badly ventilated box. Enclosure airflow often dominates the real system response.

Sensor Placement Matters More Than Most Buyers Expect

A high-quality humidity sensor measures the air at the sensor. If that air is warmed by the ESP32, regulator or display, the reading can be perfectly correct locally and still wrong for the room.

Keep the sensor away from the ESP32 module and voltage regulator.
Do not place it directly above a warm PCB section.
Provide ventilation slots near the sensor.
Avoid direct sunlight.
Avoid mounting directly against a cold/hot external wall.
Keep it away from humid breath paths or air-conditioner outlets unless that is what you intend to measure.
For outdoors, use a proper radiation shield and rain protection.

Relative humidity is temperature dependent. Even a small local heating error can cause a visible RH error, which is why sensor placement can erase the apparent advantage of buying a more accurate part.

ESP32 Self-Heating

An ESP32 can dissipate noticeably more heat while Wi-Fi is transmitting than while sleeping. A small sealed enclosure lets that heat accumulate around the sensor.

Bad layout:
[ESP32][regulator][SHT45]
inside sealed tiny box

Better layout:
[ESP32 + regulator] ---- PCB edge ---- [sensor near vent]

For precision projects, the environmental sensor is often placed on a small daughterboard or at the edge of the PCB to thermally isolate it from the main electronics.

Best Sensor for Home Assistant

Winner: SHT45.

A typical Home Assistant climate node needs stable room temperature and humidity rather than pressure. SHT45 gives the strongest measurement quality of these four while remaining simple to configure in ESPHome.

If the Home Assistant card should also show barometric pressure, choose BME280 or combine SHT45 with a dedicated pressure sensor.

Best Sensor for a Weather Station

Best single-chip choice: BME280.

Weather monitoring naturally benefits from atmospheric pressure. BME280 supplies all three standard weather variables in one device.

For a higher-end station where humidity accuracy is more important, use an SHT45 for temperature/RH and a separate pressure sensor. Whichever sensor you choose, a radiation shield matters far more than the difference between ±0.3°C and ±0.1°C if the sensor is exposed to sunlight.

Best Sensor for a Bathroom

SHT45.

Bathrooms combine fast humidity changes with occasional near-condensing conditions. The SHT45’s accuracy, reasonable response and integrated heater make it particularly well suited.

Do not continuously heat the sensor. Use the heater as a recovery tool after condensation or in a controlled low-duty-cycle strategy.

Best Sensor for a Greenhouse

SHT45 for measurement quality; AHT20 for a low-cost multi-node build.

Greenhouses can spend long periods at high RH. Sensor protection, contamination and condensation become important. For a serious design, consider a membrane-protected SHT4x variant rather than relying only on the bare breakout board.

Best Sensor for Battery Power

SHT45 and BME280 are both excellent.

The sensor itself is rarely the dominant battery load in an ESP32 deep-sleep node. The ESP32 board regulator, status LEDs and radio transmission usually matter far more.

BME280 draws only a few microamps at a 1 Hz T/H/P rate and around 0.1 µA in sleep; SHT45 is also designed for extremely low-power sensing. Do not choose DHT22 simply because its protocol looks simpler — the MCU/platform power budget is much more important.

Best Sensor for Multiple Devices on One I²C Bus

Sensor	Address situation
SHT45	Normally fixed 0x44 → one per bus unless multiplexed
BME280	0x76 or 0x77 → two can share one bus
AHT20	Fixed 0x38 → one per bus unless multiplexed
DHT22	Not I²C; each sensor normally gets its own GPIO

If the project needs eight temperature/humidity sensors, a TCA9548A I²C multiplexer can be cleaner than choosing a worse sensor purely because of address collisions.

ESPHome Configuration: SHT45

i2c:
  sda: GPIO21
  scl: GPIO22

sensor:
  - platform: sht4x
    temperature:
      name: "SHT45 Temperature"
      id: sht45_temperature
    humidity:
      name: "SHT45 Humidity"
      id: sht45_humidity
    precision: High
    update_interval: 30s

ESPHome uses the common sht4x platform for SHT40/SHT41/SHT45. You do not select “SHT45” separately in YAML; the accuracy difference is in the hardware.

ESPHome Configuration: BME280

i2c:
  sda: GPIO21
  scl: GPIO22

sensor:
  - platform: bme280_i2c
    address: 0x76
    temperature:
      name: "BME280 Temperature"
    humidity:
      name: "BME280 Humidity"
    pressure:
      name: "BME280 Pressure"
    update_interval: 30s

If nothing appears at 0x76, scan the I²C bus; many boards use 0x77. ESPHome operates BME280 in forced mode for normal sensor reads, then the sensor returns to sleep.

ESPHome Configuration: AHT20

i2c:
  sda: GPIO21
  scl: GPIO22

sensor:
  - platform: aht10
    variant: AHT20
    temperature:
      name: "AHT20 Temperature"
    humidity:
      name: "AHT20 Humidity"
    update_interval: 30s

The ESPHome platform name is aht10, but the variant: AHT20 setting selects AHT20/AHT30 behaviour. AHT20 uses I²C address 0x38.

ESPHome notes that AHT20 humidity measurements may trigger a verbose-mode warning about the component blocking for roughly tens of milliseconds. That is a characteristic of the sensor measurement timing and is not normally a fault.

ESPHome Configuration: DHT22

sensor:
  - platform: dht
    pin: GPIO4
    model: DHT22
    temperature:
      name: "DHT22 Temperature"
      accuracy_decimals: 1
    humidity:
      name: "DHT22 Humidity"
      accuracy_decimals: 1
    update_interval: 60s

A bare DHT22 usually needs a pull-up resistor between DATA and 3.3 V. Many three-pin breakout modules already include it.

Do You Need 1-Second Updates?

Usually no. Room temperature and humidity change slowly compared with CPU or power sensors. A 30–60 second ESPHome interval is typically ideal for Home Assistant.

Faster polling creates more logs and Wi-Fi traffic, can increase self-heating, and rarely improves an automation such as a bathroom fan or dehumidifier.

Filtering Readings in ESPHome

If a sensor occasionally jumps by a fraction of a degree or percentage point, do not immediately add a huge moving average that delays real changes.

For room climate sensors, a modest median or sliding-window filter can make dashboards look cleaner while retaining responsiveness.

filters:
  - median:
      window_size: 5
      send_every: 3
      send_first_at: 1

Calibration and Offsets

ESPHome can apply an offset, but calibration should be based on a trustworthy reference and stable conditions.

filters:
  - offset: -0.4

Do not calibrate an SHT45 against a random DHT22 and assume the DHT22 is correct. If several sensors disagree, first check placement, airflow and self-heating. Those causes are often larger than the sensors’ factory calibration errors.

Why Two Sensors Side by Side Can Still Disagree

They are not exactly at the same temperature.
One breakout has an LED or regulator heating it.
One sensor has slower physical response.
Air reaches one sensor more easily.
The sensors have different calibration tolerances.
One sensor is affected by PCB heat.
One humidity element has aged or been contaminated.

A comparison is most meaningful after both sensors have been placed together in free-moving air for enough time to stabilise.

Humidity Sensors and Contamination

Humidity sensing films can be affected by solvents, adhesives, cleaning chemicals, conformal coatings and prolonged extreme conditions. This matters when building your own PCB or enclosure.

Do not spray conformal coating over the sensor opening. Avoid exposing the sensing element to flux residue, silicone vapours or strong VOC sources during assembly. For dusty/wet applications, use a sensor variant or mechanical membrane designed for protection.

Common Problem: Temperature Reads Too High

First suspect local heating, especially if the sensor is inside a small enclosure with an active ESP32.

Move the sensor away from ESP32 and regulator.
Add vents.
Increase distance from display/backlight.
Reduce unnecessary Wi-Fi activity.
Compare with the enclosure open.

With BME280, remember Bosch explicitly warns that the internal temperature can be above ambient because it is influenced by PCB temperature and self-heating.

Common Problem: Humidity Reads Too Low

A local temperature reading that is too high often makes relative humidity look too low. So a “humidity calibration problem” can actually be a thermal-layout problem.

Common Problem: BME280 Has No Humidity Entity

Check whether the physical chip is really a BME280 rather than BMP280. Cheap marketplace listings frequently confuse the two parts.

Common Problem: AHT20 Does Not Appear on I²C

Check for address 0x38, verify SDA/SCL and power, and confirm the module is actually AHT20. If another AHT20 is already on the same bus, the fixed address causes a collision.

Common Problem: DHT22 Shows NaN / Invalid Readings

Check the DATA pull-up resistor.
Explicitly set model: DHT22 or AM2302.
Keep the update interval comfortably above two seconds.
Shorten poor-quality wiring.
Verify 3.3 V/GND connections.
Try another sensor — low-cost DHT clones vary considerably.

SHT45 vs BME280

Need best T/RH accuracy? → SHT45
Need pressure too?        → BME280
Need both at high quality?→ SHT45 + separate pressure sensor

SHT45 vs AHT20

SHT45 wins on measurement quality and long-term specification. AHT20 wins on cost. For ordinary bedrooms and basic automations, AHT20 can be perfectly adequate; for a higher-quality sensor node, choose SHT45.

AHT20 vs DHT22

AHT20 is my default winner for a new project. It provides a normal I²C interface, approximately ±0.3°C temperature accuracy and ±2% RH typical humidity accuracy. DHT22 mainly retains value through ubiquity and existing designs.

BME280 vs AHT20

Choose BME280 if pressure is useful. Choose AHT20 when only temperature/humidity are required and price matters. AHT20’s typical humidity and temperature accuracy is actually stronger on paper than BME280’s climate channels, but it lacks the barometer.

My 2026 Ranking

Category	Winner	Reason
Best overall T/RH sensor	SHT45	±1% RH / ±0.1°C typical, heater, strong stability
Best weather/environment sensor	BME280	Adds useful barometric pressure
Best budget modern sensor	AHT20	Strong accuracy + I²C at low cost
Best legacy compatibility	DHT22	Huge tutorial/library ecosystem
Best bathroom/high humidity	SHT45	Accuracy + controlled heater
Best one-chip outdoor weather node	BME280	T/H/P in one package
Best reference for comparing cheap nodes	SHT45	Tightest specification of the group

Decision Flow

Need barometric pressure?
 └─ YES → BME280
 └─ NO
     Is best temperature/humidity accuracy important?
      └─ YES → SHT45
      └─ NO
          Is low price the main goal?
           └─ YES → AHT20
           └─ NO → SHT45

Already own a DHT22?
 └─ Use it if it works; don't buy another just because it's familiar.

Final Recommendation

For a new ESP32/Home Assistant temperature and humidity project in 2026, I would buy the SHT45 when measurement quality matters and the AHT20 when budget matters.

I would choose the BME280 when pressure is part of the requirement, not because it is the most accurate humidity sensor. Its real strength is delivering temperature, humidity and excellent barometric data from one mature, ultra-low-power device.

I would not choose DHT22 for a completely new design unless price/availability or legacy compatibility forced the decision. It still measures room climate adequately, but AHT20 gives a cleaner modern interface and SHT45 gives a large step up in measurement quality.

SHT45 → best temperature + humidity
BME280 → best temperature + humidity + pressure package
AHT20 → best budget modern option
DHT22 → legacy / existing projects

And whichever sensor you buy, spend just as much thought on placement, ventilation and thermal isolation from the ESP32. A badly mounted SHT45 can easily produce less representative room readings than a cheaper sensor mounted correctly.

Related ESP32 Guides

Datasheets & External Resources

All manufacturer/framework references are collected here so the main article keeps readers inside esp32.co.uk.

Sensirion SHT45 Product Page — current ±1% RH / ±0.1°C specifications, response time, supply range and SHT4x documentation.
Sensirion SHT4x Datasheet — detailed SHT45 accuracy maps, long-term drift and heater behaviour.
Bosch BME280 Datasheet — official humidity, pressure, temperature, power and interface specifications.
ESPHome SHT4x Component — SHT40/SHT41/SHT45 configuration and heater options.
ESPHome BME280 Component — I²C/SPI configuration, addresses and oversampling.
ESPHome AHT10/AHT20 Component — AHT20 variant selection and I²C setup.
ESPHome DHT Component — DHT22/AM2302 configuration, pull-up and timing guidance.
Adafruit AHT20 Overview — current AHT20 breakout guidance and typical ±2% RH / ±0.3°C performance.