Keyestudio KS4028 Manual page 316

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If your computer system is Windows7/8 instead of Windows 10, the device
can ' t be paired in Google Chrome, as a result, the digital and analog
signals can't be read.
Here, we need CoolTerm software to read data.
Open CoolTerm, click Options to select SerialPort. Set COM port and
115200 baud rate(the baud rate of USB serial communication of micro:bit
V2 is 115200 through the test). Click"OK"and"Connect".
The more the immersed area of the module, the larger the analog value.
As shown below;
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