Can I calibrate the Aht20 sensor?

[Broekieman]

I bought the Aht20 breakout board and the temperature is 1 degree lower than my other sensor. Can I calibrate this sensor and how? I am using it in Home assistant with esphome.

[Franklin97355]

There is no hardware calibration available but you could add 1 to your reading to compensate. There are documents here

[mikeysklar]

The sensor can self calibrate and will return true on success.

This is something you can do with CircuitPython or the Arduino library. There is a bit to enable self calibrate and another to read the result.

https://docs.circuitpython.org/projects ... t/api.html

Code: Select all

#define AHTX0_CMD_CALIBRATE 0xE1     ///< Calibration command
#define AHTX0_STATUS_CALIBRATED 0x08 ///< Status bit for calibrated

https://github.com/adafruit/Adafruit_AH ... it_AHTX0.h

[Broekieman]

The sensor can self calibrate and will return true on success.

This is something you can do with CircuitPython or the Arduino library. There is a bit to enable self calibrate and another to read the result.

https://docs.circuitpython.org/projects ... t/api.html

Code: Select all

#define AHTX0_CMD_CALIBRATE 0xE1     ///< Calibration command
#define AHTX0_STATUS_CALIBRATED 0x08 ///< Status bit for calibrated

https://github.com/adafruit/Adafruit_AH ... it_AHTX0.h

I am new to this. Do i need a special board to use arduino and what is the complete code for arduino to calibrate the sensor? Or can calibration only be done with Circuit Python and a special board?

[mikeysklar]

We don't have example code for doing the calibrate, but I can probably save you some effort here.

The AHT20 is +/- .3C accuracy. Which means you will typically see a 1 degree Fahrenheit skew between devices.

This sensor has a typical accuracy of +- 2% relative humidity, and +-0.3 °C at 20-80% RH and 20-60 °C. There is only one I2C address so it's not a good option when you need multiple humidity sensors.

https://www.adafruit.com/product/4566

[Broekieman]

It is +-0.3 °C and I have +- 1. °C

[Broekieman]

What board do you advice for CircuitPython? Can someone explain how sellf calibrating works?