Simplify navigation, commands, and access with ATtiny817 and PIC18LF25K42
Unlock your world with a gentle tap!
Published Nov 01, 2023
Click board™
TouchKey 2 Click
Dev Board
EasyPIC v8
Compiler
NECTO Studio
MCU
PIC18LF25K42
Our touchkey solution revolutionizes user interaction by providing a sensitive and elegant touch interface that responds effortlessly to the gentlest tap of your finger
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Hardware Overview
How does it work?
TocuhKey 2 Click is based on the ATtiny817, an integrated touch QTouch® controller from Microchip. This Click is designed to run on a 3.3V power supply. The four LEDs onboard the click indicate when the Key (Pad) is pressed. TouchKey 2 click communicates with the target microcontroller over the UART interface. You can use TouchKey 2 Click in all conditions without fearing something will happen due to moisture and water droplets falling on it. The plastic overlay on the TouchKey 2 click protects the board from moisture. Thanks to this feature, the electronic components are safe. The ATtiny817 has a driven shield for improved moisture and noise-handling performance. Microchip's ATtiny817 is a
microcontroller that uses an 8-bit AVR® processor with hardware multiplier, running at up to 20MHz and with up to 8KB Flash, 512 bytes of SRAM, and 128 bytes of EEPROM. The ATtiny817 uses the latest technologies from Microchip with a flexible and low-power architecture, including Event System and SleepWalking, accurate analog features, and advanced peripherals. Capacitive touch interfaces with proximity sensing and a driven shield are supported with the integrated QTouch® peripheral touch controller. The module supports wake-up on touch from power-save sleep mode. Capacitive buttons can be toggled even when placed under a layer of glass or paper. There are four LEDs for four touch keys. If key A is pressed,
LED_A is ON, and such. In addition, there is UART communication between ATtiny817 and the main MCU. The header onboard the TouchKey 2 click can be used for device programming. Current firmware sends data packets via UART (based on the demo example in our library). SPI communication is possible with firmware modifications. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
Features overview
Development board
EasyPIC v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports many high pin count 8-bit PIC microcontrollers from Microchip, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, EasyPIC v8 provides a fluid and immersive working experience, allowing access anywhere and under any
circumstances at any time. Each part of the EasyPIC v8 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.
Communication options such as USB-UART, USB DEVICE, and CAN are also included, including the well-established mikroBUS™ standard, two display options (graphical and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from the smallest PIC MCU devices with only eight up to forty pins. EasyPIC v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC
MCU Memory (KB)
32
Silicon Vendor
Microchip
Pin count
28
RAM (Bytes)
2048
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the EasyPIC v8 as your development board.
Track your results in real time
Application Output
This Click board can be interfaced and monitored in two ways:
Application Output- Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
UART Terminal- Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.
Software Support
Library Description
This library contains API for TouchKey 2 Click driver.
Key functions:
touchkey2_set_reset_pin- Set reset pin functiontouchkey2_clear_reset_pin- Clear reset pin functiontouchkey2_target_reset- Reset function
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* \file
* \brief Touchkey2 Click example
*
* # Description
* This application is touch controller.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initalizes device and makes an initial log.
*
* ## Application Task
* Checks if new data byte have received in rx buffer (ready for reading),
and if ready than reads one byte from rx buffer, that show if and what key is pressed.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "touchkey2.h"
// ------------------------------------------------------------------ VARIABLES
static touchkey2_t touchkey2;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
touchkey2_cfg_t cfg;
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, "---- Application Init ----" );
// Click initialization.
touchkey2_cfg_setup( &cfg );
TOUCHKEY2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
touchkey2_init( &touchkey2, &cfg );
}
void application_task ( void )
{
char tmp;
tmp = touchkey2_generic_single_read( &touchkey2 );
if( tmp == 0x00 )
{
log_printf( &logger, " Key released\r\n" );
log_printf( &logger, "------------------- \r\n" );
}
else if( tmp == 0x01 )
{
log_printf( &logger, " Key A pressed\r\n" );
log_printf( &logger, "------------------- \r\n" );
}
else if( tmp == 0x02 )
{
log_printf( &logger, " Key B pressed\r\n" );
log_printf( &logger, "------------------- \r\n" );
}
else if( tmp == 0x04 )
{
log_printf( &logger, " Key C pressed\r\n" );
log_printf( &logger, "------------------- \r\n" );
}
else if( tmp == 0x08 )
{
log_printf( &logger, " Key D pressed \r\n" );
log_printf( &logger, "------------------- \r\n" );
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
