Opto Encoder 4 Click

How does it work?

Opto Encoder 4 Click is based on the EE-SX4330, a transmissive photo-microsensor from OMRON. The sensor uses a two-tower design. The emitter consists of an LED with a peak emission wavelength of 855nm and a 1.4×1.4mm window. The detector has a peak spectral sensitivity wavelength of 870nm and a narrower window than the emitter (1×0.3mm). This, and a fast response delay time, ensures more precise readings of a spinning encoder disk. By calculating the number of readings in a given time, you can determine the spinning speed. However, you can’t detect the rotation.

Opto Encoder 4 Click uses a general-purpose IO to notify the host MCU of interrupts the EE-SX4330 provides over the OUR pin. For visual presentation, there is the OUT LED. The OUT pin is the opto encoder output. There is a 4-pin header that allows you to use those outputs for an external device (relay, LED, and more).

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 Opto Encoder 4 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Opto Encoder Output	OUT	1	AN	PWM	16	NC
	NC	2	RST	INT	15	OUR	Output Detection
ID COMM	CS	3	CS	RX	14	NC
	NC	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

Opto Encoder 4 Click electrical specifications

Software Support

We provide a library for the Opto Encoder 4 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

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

Library Description

This library contains API for Opto Encoder 4 Click driver.

Key functions

• optoencoder4_get_out_pin This function returns the output pin logic state.

• optoencoder4_get_our_pin This function returns the output pin reversed logic state.

Example Description

This example demonstrates the use of Opto Encoder 4 Click board™ by processing the encoder output pin state and incrementing the step counter on falling edge.

void application_task ( void ) 
 { 
     static uint32_t step_cnt = 0; 

     log_printf( &logger, " Step counter : %lurn", step_cnt ); 

     // Increment counter on falling edge of output pin 
     while ( !optoencoder4_get_out_pin ( &optoencoder4 ) ); 
     while ( optoencoder4_get_out_pin ( &optoencoder4 ) ); 

     step_cnt++; 
 }

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

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.OptoEncoder4

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 MikroElektronika compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MikroElektronika 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.