Cap Touch 6 Click

How does it work?

Cap Touch 6 Click is based on the IQS227D, a fully integrated single-channel capacitive controller with an internal voltage regular and reference capacitor from Azoteq. As known, the capacitive touch technology works by detecting changes in capacitance on the screen or touchpad, in this case, the sensing area at the top of the frontal side of the board, when a finger or other conductive object comes into contact with it. The IQS227D is built on ProxSense® low voltage platform, ideal for battery application, and comes with dual outputs (touch and proximity outputs don’t need to be configured), a low-power mode while sensing proximity, and an advanced on-chip digital signal processing.

Touch and proximity features, alongside its mikroBUS™ pins, marked TOU and POU, only used to communicate with MCU, also have their corresponding LED indicators, labeled Touch and Proximity, reporting the activity of these features. If a touch/proximity event is detected on the onboard sensing pad, the state of the corresponding LED will be changed, indicating an activated channel.

In addition to pins of the mikroBUS™ socket, these functions can also be found on the unpopulated header for external uses if they are necessary for the user in some specific application. As mentioned earlier, this board contains a capacitive sensing area that is the only element on the top side of the board, allowing the protective acrylic plexiglass layer placement.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper on the back side of the board. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the 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 Cap Touch 6 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Touch Output	TOU	1	AN	PWM	16	POU	Proximity Output
	NC	2	RST	INT	15	NC
	NC	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

Cap Touch 6 Click electrical specifications

Software Support

We provide a library for the Cap Touch 6 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 Cap Touch 6 Click driver.

Key functions

• captouch6_get_tout_pin This function returns the TOUT pin logic state.

• captouch6_get_pout_pin This function returns the POUT pin logic state.

Example Description

This example demonstrates the use of Cap Touch 6 Click board™ by reading and displaying the touch and proximity events.

void application_task ( void ) 
 { 
     static uint8_t old_touch_state = 0, old_prox_state = 0; 
     uint8_t touch_state = captouch6_get_tout_pin ( &captouch6 ); 
     uint8_t prox_state = captouch6_get_pout_pin ( &captouch6 ); 
     if ( ( old_touch_state != touch_state ) || ( old_prox_state != prox_state ) ) 
     { 
         log_printf( &logger, " Touch: %srn", ( char * ) ( !touch_state ? "detected" : "idle" ) ); 
         log_printf( &logger, " Proximity: %srnn", ( char * ) ( !prox_state ? "detected" : "idle" ) ); 
         old_touch_state = touch_state; 
         old_prox_state = prox_state; 
     } 
 }

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.CapTouch6

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.