Rotary RGB Click

How does it work?

Rotary RGB Click is based on the LED ring composed of 16 individual RGB LEDs, the WS2812B-2020 from Worldsemi, alongside a high-quality rotary encoder from ALPS, the EC12D1564402, visually representing the encoder position and more. The WS2812B-2020s internal configuration includes an intelligent digital port data latch and signals to reshape the amplification drive circuit. It also consists of a precision internal oscillator and a voltage-programmable constant current control part, ensuring consistent pixel point light color height. The WS2812B-2020 is an LED with low driving voltage (5V from mikroBUS™ power rail is used as its main power supply), environmental protection and energy saving, high brightness, large scattering angle, good consistency, low power, long life, and other advantages. This Click board™ makes the perfect solution for the development of various interesting visual effects for any application, such as flexible position, value indicator, and more.

The data transfer protocol uses a single NZR communication mode via DO and DI pins of the mikroBUS™ socket. After the pixel Power-On reset sequence, the DI port of the WS2812B-2020 receives data from the host controller; the first pixel collects initial 24-bit data and then sent to the internal data latch, and the other data, which is reshaped by the internal signal reshaping amplification circuit is sent to the next cascade pixel through the DO port. After transmission for each pixel, the signal is reduced to 24bit. Pixel adopts auto reshaping transmit technology, making the pixel cascade number not limited to the signal transmission, only depending on the speed of signal transmission.

The EC12D1564402 is a 15-pulse incremental rotary encoder with a push button. This encoder has unique mechanical specifications (debouncing time for its internal switches goes down to 2ms), and it can withstand a huge number of switching cycles, up to 30.000. The supporting debouncing circuitry allows contacts to settle before the output is triggered fully. Rotating the encoder, it outputs A and B signals (out of phase to each other) on the two mikroBUS™ lines, ENA and ENB pins of the mikroBUS™ socket, alongside the push-button contact, which outputs through the SW pin of the mikroBUS™ socket. Four SN74LVC1T45 single-bit bus transceivers from Texas Instruments are used for logic-level translation of encoder and data transfer protocol signals.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on Rotary RGB Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Encoder Output B	ENB	1	AN	PWM	16	ENA	Encoder Output A
Data OUT	DO	2	RST	INT	15	SW	Switch Output
ID COMM	CS	3	CS	RX	14	NC
Data IN	DI	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Rotary RGB Click electrical specifications

Software Support

We provide a library for the Rotary RGB Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Rotary RGB Click driver.

Key functions

• rotaryrgb_set_led_pos_color This function sets the desired color for the selected LED position

• rotaryrgb_set_all_leds_data This function, using the GPIO protocol, writes the desired array of 16 elements of data to control all LEDs.

• rotaryrgb_get_state_switch This function return rotary encoder switch signal, states of the SW(INT) pin.

Example Description

This library contains the API for the Rotary RGB Click driver to control LEDs states and a rotary encoder position readings.

void application_task ( void )  
 { 
     rotaryrgb_set_led_pos_color( &rotaryrgb, led_pos % 17, demo_color_table[ led_color_sel ] ); 
     rotaryrgb_switch_detection( ); 
     rotaryrgb_encoder_mechanism( ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.RotaryRGB

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.