In this article we connect a AHT20 Temperature & Humidity Sensor to an Adafruit Feather M0 running Circuitpython
AHT20, as a new generation of temperature and humidity sensors, has established a new standard in size and intelligence. It is embedded in a double row flat no-lead package suitable for reflow soldering, with a bottom of 3 x 3 mm and a height of 1.0 mm.
The sensor outputs calibrated digital signals in standard IAHT20, as a new generation of temperature and humidity sensors, has established a new standard in size and intelligence.
It is embedded in a double row flat no-lead package suitable for reflow soldering, with a bottom of 3 x 3 mm and a height of 1.0 mm.
The sensor outputs calibrated digital signals in standard I2C format.AHT20 is equipped with a newly designed ASIC chip, an improved MEMS semiconductor capacitive humidity sensing element and a standard on-chip temperature sensing element.
|Supply voltage||DC : 2.0 – 5.5V|
|Measuring range (humidity)||0 ~ 100% RH|
|Measuring range (temperature)||-40 ~ + 85 ℃|
|Humidity accuracy||± 2 % RH ( 25 ℃ )|
|Temperature accuracy||± 0.3 ℃|
|Resolution||temperature: 0.01℃ Humidity: 0.024%RH|
|Response time||temperature: 5s humidity: 8s 1/e (63%)|
|Output signal||I2C signal|
The sensor you can pick up in the $6 price range – you can connect to the sensor using a standard header the classic dupont style jumper wire.
I used a Qwiic cable – since a few sensors seem to use these but this is optional
|Adafruit Feather M0 Express||Amazon link|
|AHT20||AHT20 Temperature and Humidity Sensor Module High-precision Humidity Sensor|
|Connecting cables||Aliexpress product link|
I used the Adafruit AHT20 sensor and in this case used the Stemma connection
For the STEMMA QT cables, it uses the Qwiic convention:
Black for GND
Red for V+
Blue for SDA
Yellow for SCL
So color coded for ease of use, this layout shows a connection to the module
I used Mu for development
The following is based on a library , I copied the adafruit_sht4x.mpy library for this device to the lib folder on my Feather M0 Express – https://circuitpython.org/libraries
This is the basic example which comes with the library
""" Basic `AHTx0` example test """ import time import board import adafruit_ahtx0 # Create sensor object, communicating over the board's default I2C bus i2c = board.I2C() # uses board.SCL and board.SDA sensor = adafruit_ahtx0.AHTx0(i2c) while True: print("\nTemperature: %0.1f C" % sensor.temperature) print("Humidity: %0.1f %%" % sensor.relative_humidity) time.sleep(2)
Here is what I saw in Mu REPL window
Temperature: 26.4 C
Humidity: 41.6 %
Temperature: 26.0 C
Humidity: 40.3 %
Temperature: 27.7 C
Humidity: 40.2 %
Temperature: 27.9 C
Humidity: 41.0 %
Temperature: 26.8 C
Humidity: 39.2 %