Button 3 Click

How does it work?

Button 3 Click is based on three tactile switches, members of the TL3215 series of tactile switches from E-Switch. Each specific switch features several key characteristics, denoted by its part number TL3215AF160BQ/TL3215AF160RQ/TL3215AF160GQ. The ‘TL’ in the part number indicates it belongs to the TL series, known for its high reliability and consistent performance. The ‘3215’ model is a testament to its robust construction and design. It includes an actuator option (‘A’) with a 2mm actuator, ensuring precise and responsive operation. The ‘F160’ denotes an actuation force of 160gf, providing a balanced tactile feedback that is neither too hard nor too soft, thus preventing accidental presses while remaining user-friendly. The ‘B/R/G’ indicates the blue/red/green color of the switch, making it easily identifiable, while the ‘Q’ signifies the use of silver contact material, known for its excellent conductivity and durability.

Regarding specifications, these switches have an impressive electrical rating of 50mA at 12VDC, and their electrical and mechanical life is rated at 1,000,000 cycles, ensuring longevity and reliability in various applications. Initially, the contact resistance is a maximum of 100mΩ, while the insulation resistance stands at 100MΩ at 500VDC, highlighting its excellent electrical isolation properties. The switches also have a dielectric strength of 250VAC for 1 minute and operate efficiently from -40°C to 85°C. The contact arrangement is single-pole single-throw (SPST), providing straightforward switching functionality. Additionally, the integrated LED in this version operates at a forward current of 20mA with a typical forward voltage of 3V at 20mA. It delivers a typical luminous intensity of 100mcd, ensuring clear visibility of the switch’s status.

This Click board™ is designed in a unique format supporting the newly introduced MIKROE feature called “Click Snap.” Unlike the standardized version of Click boards, this feature allows the main sensor area to become movable by breaking the PCB, opening up many new possibilities for implementation. Thanks to the Snap feature, the switches can operate autonomously by accessing their signals directly on the pins marked 1-8. Additionally, the Snap part includes a specified and fixed screw hole position, enabling users to secure the Snap board in their desired location.

Button 3 Click communicates with the host MCU via the TCA6408A port expander using the I2C interface. This port expander allows control of all buttons and their control signals, including a signal dedicated to detecting button presses (providing an interrupt signal to the host MCU (INT) whenever the tactile switch is activated) and the signal that controls the LED on the TL3215. In addition to the I2C interface pins, the port expander also uses a reset (RST) pin and a jumper for I2C address selection, ADDR SEL.

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.

Click Snap

Click Snap is an innovative feature of our standardized Click add-on boards, introducing a new level of flexibility and ease of use. This feature allows for easy detachment of the main sensor area by simply snapping the PCB along designated lines, enabling various implementation possibilities. For detailed information about Click Snap, please visit the official page dedicated to this feature.

Specifications

Pinout diagram

This table shows how the pinout on Button 3 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
Reset	RST	2	RST	INT	15	INT	Interrupt
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Button 3 Click electrical specifications

Software Support

We provide a library for the Button 3 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 Button 3 Click driver.

Key functions

• button3_toggle_red_led This function toggles the red button LED by toggling the RK pin logic state.

• button3_toggle_green_led This function toggles the green button LED by toggling the GK pin logic state.

• button3_toggle_blue_led This function toggles the blue button LED by toggling the BK pin logic state.

Example Description

This example demonstrates the use of Button 3 Click board™ by toggling a button LED and its switch state on a button press.

void application_task ( void ) 
 { 
     static uint8_t red_switch_state = BUTTON3_SWITCH_OFF; 
     static uint8_t green_switch_state = BUTTON3_SWITCH_OFF; 
     static uint8_t blue_switch_state = BUTTON3_SWITCH_OFF; 
     uint8_t switch_state = BUTTON3_SWITCH_OFF; 

     if ( BUTTON3_PIN_STATE_LOW == button3_get_int_pin ( &button3 ) ) 
     { 
         if ( ( BUTTON3_OK == button3_get_red_button ( &button3, &switch_state ) ) &&  
              ( BUTTON3_BUTTON_PRESSED == switch_state ) ) 
         { 
             button3_toggle_red_led ( &button3 ); 
             red_switch_state ^= BUTTON3_SWITCH_ON; 
             if ( BUTTON3_SWITCH_ON == red_switch_state ) 
             { 
                 log_printf ( &logger, " RED SWITCH ONrnn" ); 
             } 
             else 
             { 
                 log_printf ( &logger, " RED SWITCH OFFrnn" ); 
             } 
         } 
         if ( ( BUTTON3_OK == button3_get_green_button ( &button3, &switch_state ) ) &&  
              ( BUTTON3_BUTTON_PRESSED == switch_state ) ) 
         { 
             button3_toggle_green_led ( &button3 ); 
             green_switch_state ^= BUTTON3_SWITCH_ON; 
             if ( BUTTON3_SWITCH_ON == green_switch_state ) 
             { 
                 log_printf ( &logger, " GREEN SWITCH ONrnn" ); 
             } 
             else 
             { 
                 log_printf ( &logger, " GREEN SWITCH OFFrnn" ); 
             } 
         } 
         if ( ( BUTTON3_OK == button3_get_blue_button ( &button3, &switch_state ) ) &&  
              ( BUTTON3_BUTTON_PRESSED == switch_state ) ) 
         { 
             button3_toggle_blue_led ( &button3 ); 
             blue_switch_state ^= BUTTON3_SWITCH_ON; 
             if ( BUTTON3_SWITCH_ON == blue_switch_state ) 
             { 
                 log_printf ( &logger, " BLUE SWITCH ONrnn" ); 
             } 
             else 
             { 
                 log_printf ( &logger, " BLUE SWITCH OFFrnn" ); 
             } 
         } 
         Delay_ms ( 100 ); 
     } 
 }

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.Button3

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.