DHT20 temperature and humidity sensor at a three-quarter angle, showing the 12-window vented grille, moulded ASAIR lettering and four straight pins

DHT20 Temperature & Humidity Sensor - I2C, 3.3V or 5V, 4-Pin

$4.49 NZD
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DHT20 temperature and humidity sensor at a three-quarter angle, showing the 12-window vented grille, moulded ASAIR lettering and four straight pins
  • DHT20 temperature and humidity sensor at a three-quarter angle, showing the 12-window vented grille, moulded ASAIR lettering and four straight pins
  • Front of the DHT20 straight on, grille towards you and pins down: pin 1 VDD on the left, then SDA, GND and SCL
  • Back of the DHT20 with its laser-marked label: model DHT20, 2.2-5.5V supply, 0-100%RH, -40 to 80 C, ±3%RH ±0.5 C and serial number
  • DHT20 dimensions: body 12.6 mm wide and 16.1 mm tall, pins 7.2 mm long at 2.54 mm pitch
DHT20 Temperature & Humidity Sensor - I2C, 3.3V or 5V, 4-Pin
SKU: NZE-DHT20-I2C

DHT20 Temperature & Humidity Sensor - I2C, 3.3V or 5V, 4-Pin

$4.49 NZD
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The DHT20 is a calibrated temperature and humidity sensor in the familiar 4-pin DHT housing, with a digital I2C output instead of the DHT11's single-wire signal. It runs on 3.3V or 5V, sits at I2C address 0x38 and reads with standard Arduino, ESP32, ESPHome and Raspberry Pi libraries. If you want a single data wire instead, see our DHT22 / AM2302 module with the pull-up fitted, or the low-cost bare DHT11.

Specifications

SensorDHT20, AHT20-class chip, factory calibrated
InterfaceI2C, fixed address 0x38, up to 400 kHz
Supply2.2 to 5.5V, works on 3.3V and 5V boards
Humidity0 to 100% RH, ±3% RH typical
Temperature-40 to 80°C, ±0.5°C typical
Pinout1 VDD, 2 SDA, 3 GND, 4 SCL (grille towards you, pins down)
Pull-ups4.7k on SDA and SCL if your bus has none (not included)
Size12.6 x 16.1 x 5.8 mm body, 7.2 mm pins at 2.54 mm pitch
Reading rateOne reading every 2 seconds or slower

Datasheets

Full technical datasheet PDF

What's in the box

1×
DHT20 temperature and humidity sensor

Bare 4-pin sensor in an anti-static bag. Pull-up resistors and wires are not included.

Great for

Room temperature and humidity in Home Assistant via ESPHome
Upgrading a DHT11 project to calibrated I2C readings
Checking bathroom or wardrobe humidity before mould sets in
Greenhouse and seed-raising humidity logging
Showing temperature and humidity on an I2C OLED
Battery-powered loggers that sleep between readings

Wiring & getting started

  1. Find the pins

    Hold the sensor with the vented grille towards you and the pins pointing down. From left to right the pins are 1 VDD, 2 SDA, 3 GND and 4 SCL. SDA and SCL are not side by side, so check them twice.

  2. Power it from your board's logic voltage

    On an Arduino Uno or Nano connect VDD to 5V, SDA to A4 and SCL to A5. On an ESP32 connect VDD to 3.3V, SDA to GPIO21 and SCL to GPIO22. GND goes to GND on both.

  3. Add pull-ups if the bus needs them

    If nothing else on the I2C bus has pull-up resistors, fit 4.7k from SDA to VDD and from SCL to VDD. A 100nF capacitor across VDD and GND, close to the sensor, keeps the supply clean.

  4. Read it

    In the Arduino IDE install the DHT20 library by Rob Tillaart, or Adafruit AHTX0, and open its example. In ESPHome use the aht10 platform with variant AHT20. Wait at least 2 seconds between readings.

Note: The DHT20 uses I2C, so it is not a drop-in swap for a DHT11 or DHT22 in existing code or wiring. Hand solder only, briefly, and give the sensor a day or two in normal room air afterwards before trusting the humidity reading.
Related guide DHT22 vs DS18B20 vs BMP280: Which Sensor Should You Choose?Choose a sensor for air temperature, humidity, remote temperature or pressure. Compare DHT22, DS18B20 and BMP280, with practical wiring and placement checks.

Frequently Asked Questions

Answers to the questions buyers ask most.

Is it a drop-in replacement for a DHT11 or DHT22?
No. It fits the same kind of 4-pin footprint, but it talks I2C on two wires (SDA and SCL) instead of the DHT11's single data wire. Rewire pin 2 to SDA and pin 4 to SCL and switch to a DHT20 or AHT20 library.
Does it work with a 3.3V ESP32 and a 5V Arduino?
Yes, it runs from 2.2 to 5.5V. Power it from the same voltage as your board's logic: 3.3V on an ESP32 or Raspberry Pi, 5V on an Arduino Uno or Nano. Pull SDA and SCL up to that same voltage.
Do I need pull-up resistors?
Only if nothing else on the I2C bus provides them. Many I2C modules, such as OLED displays and sensor boards, already have pull-ups fitted. If the DHT20 is the only device, fit 4.7k from SDA to VDD and from SCL to VDD. They are not included.
Which library should I use?
In the Arduino IDE, the DHT20 library by Rob Tillaart or Adafruit AHTX0 both work. In ESPHome, use the aht10 platform with variant: AHT20. On a Raspberry Pi it shows up at 0x38 in i2cdetect and works with AHT20 Python drivers.
Can I connect several DHT20s to one board?
Not on the same I2C bus, because the address is fixed at 0x38. Use a second I2C bus (an ESP32 has two) or an I2C multiplexer to read more than one.
How often can I take a reading?
Every 2 seconds or slower. Each measurement takes about 80 ms, and reading much faster than that warms the sensor slightly, which pushes temperature up and humidity down.
Why does the humidity read wrong after I soldered it?
Heat dries the sensing layer. Leave it in normal room air for a day or two, or in a humid spot above 75% RH for 12 hours, and it recovers. Solder each pin quickly at no more than 300°C.
Can I use it outdoors?
In a sheltered, ventilated spot, yes. It is not sealed, so keep it out of rain, condensation and direct sun. A louvred radiation shield or the underside of an eave works well.
DHT20 or DHT22, which should I buy?
Choose the DHT20 for an I2C bus, low sleep current and a lower price. Choose our DHT22 / AM2302 module if you want a single data wire with the pull-up already on the board and slightly tighter humidity accuracy, ±2% RH.

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