Rotary Encoder

The Inkplate 6 MOTION includes a AS5600 magnetic rotary encoder, which allows precise rotation tracking. It is ideal for navigating menus or fine tuning numerical input values.

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This peripheral IC is mostly relevant to you only if you have the Inkplate 6 MOTION with enclosure, as it cointains the perfectly-placed dial with magnet to interface with the rotary encoder IC.

Rotary encoder on the Inkplate 6 MOTION enclosure

The dial made to interface with the rotary encoder is transparent! It's made this way so that the first onboard RGB LED can change it's color when it lights up!

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The AS5600 implementation in the Inkplate library uses this library from Rob Tillaart:

AS5600

Arduino library for AS5600 and AS5600L magnetic rotation meter

Initializaiton

Before using the rotary encoder, it must be powered on and initialized.

// Enable power to the rotary encoder
inkplate.peripheralState(INKPLATE_PERIPHERAL_ROTARY_ENCODER, true);
delay(100);

// Initialize rotary encoder
inkplate.rotaryEncoder.begin();

inkplate.rotaryEncoder.begin()

Initializes the rotary encoder sensor for use. This function must be called before retrieving values.

Returns: Returns true if initialization was successful, otherwise false.

Reading the rotation angle

To get the current angle of the rotary encoder in degrees:

int currentValue = (int)(inkplate.rotaryEncoder.rawAngle() * AS5600_RAW_TO_DEGREES);

This will return the current rotational position of the encoder.

inkplate.rotaryEncoder.rawAngle()

Gets the raw angle value from the rotary encoder, which can be converted to degrees or radians.

Returns: Returns the raw angle as a 12-bit integer (0-4095).

You can use the following factors for conversion:

Conversion	Constant	Value
Raw to Degrees	`AS5600_RAW_TO_DEGREES`	`360.0 / 4096` (`0.087890625`)
Raw to Radians	`AS5600_RAW_TO_RADIANS`	`PI * 2.0 / 4096` (`0.00153398079`)

Full Example

This example tracks the rotary encoder's angle and updates the display when the angle changes by 2 degrees:

Inkplate_6_MOTION_Rotary_Encoder.ino

Full rotary encoder example in the Inkplate library