Switch signals between their pull-up or pull-down states with DTH-08 and ATmega328P
Simple yet effective way to manage signal states for electronic projects, enhancing their reliability and performance
Published Mar 13, 2024
Click board™
EasyPull Click
Dev Board
Arduino UNO Rev3
Compiler
NECTO Studio
MCU
ATmega328P
Configure used mikroBUS™ signals within applications to be either in a pull-up or pull-down state
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Hardware Overview
How does it work?
EasyPull Click is a compact add-on board designed to empower users to easily configure used mikroBUS™ signals within their applications to be either in a pull-up or pull-down state. This board is equipped with two 8-position switches that enable the pull-up or pull-down configuration for mikroBUS™ signals such as AN, RST, PWM, and INT, as well as for communication protocols like SPI, UART, and I2C. All resistors on the EasyPull Click are set to 4.7kΩ, ensuring consistent performance across various signal lines. Whether for prototyping or final product development, EasyPull Click provides developers with a practical tool for enhancing their projects with reliable signal management capabilities. Configuring the signal lines to the desired state is straightforward, thanks to the clear directional arrows on each switch's left
side. These arrows indicate the direction to toggle the switch to achieve either a pull-up (upward direction) or pull-down (downward direction) state. This feature allows for quick and easy adjustments, enhancing the board's usability and flexibility in different project setups. Additionally, the EasyPull Click board™ offers an unpopulated header marked as EXT, which extends four signals from the switches - two from each - labeled as EXTx. This header can be used as a conventional GPIO (General Purpose Input/Output) signal according to the user's requirements. The board also includes two sets of unmarked resistors at the top, connected to the EXT signals, maintaining the 4.7kΩ resistance value consistent with the rest of the board. A unique feature of the EasyPull Click is its low-power mode capability, achieved by cutting
the ID CUT traces on the back of the board. The connection to the lower section of the board, which includes the power (PWR) LED and ID chip, is interrupted by cutting these lines. This action results in significant energy savings, making the EasyPull Click an excellent choice for energy-sensitive applications that require efficient power management. 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.
Features overview
Development board
Arduino UNO is a versatile microcontroller board built around the ATmega328P chip. It offers extensive connectivity options for various projects, featuring 14 digital input/output pins, six of which are PWM-capable, along with six analog inputs. Its core components include a 16MHz ceramic resonator, a USB connection, a power jack, an
ICSP header, and a reset button, providing everything necessary to power and program the board. The Uno is ready to go, whether connected to a computer via USB or powered by an AC-to-DC adapter or battery. As the first USB Arduino board, it serves as the benchmark for the Arduino platform, with "Uno" symbolizing its status as the
first in a series. This name choice, meaning "one" in Italian, commemorates the launch of Arduino Software (IDE) 1.0. Initially introduced alongside version 1.0 of the Arduino Software (IDE), the Uno has since become the foundational model for subsequent Arduino releases, embodying the platform's evolution.
Microcontroller Overview
MCU Card / MCU
Architecture
AVR
MCU Memory (KB)
32
Silicon Vendor
Microchip
Pin count
28
RAM (Bytes)
2048
You complete me!
Accessories
Click Shield for Arduino UNO has two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the Arduino UNO board without effort. The Arduino Uno, a microcontroller board based on the ATmega328P, provides an affordable and flexible way for users to try out new concepts and build prototypes with the ATmega328P microcontroller from various combinations of performance, power consumption, and features. The Arduino Uno has 14 digital input/output pins (of which six can be used as PWM outputs), six analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header, and reset button. Most of the ATmega328P microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the Arduino UNO board with our Click Shield for Arduino UNO, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
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 Arduino UNO Rev3 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 EasyPull Click driver.
Key functions:
easypull_get_an_pin- This function reads the state of the AN pin of EasyPull click boardeasypull_get_rst_pin- This function reads the state of the RST pin of EasyPull click boardeasypull_get_cs_pin- This function reads the state of the CS pin of EasyPull click board
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 main.c
* @brief EasyPull Click Example.
*
* # Description
* This example demonstrates the use of PIR 2 Click boards.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and USB UART logger.
*
* ## Application Task
* It checks the state of the pins and displays their state on the USB UART.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "easypull.h"
static easypull_t easypull; /**< EasyPull Click driver object. */
static log_t logger; /**< Logger object. */
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
easypull_cfg_t easypull_cfg; /**< Click config object. */
/**
* 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.
easypull_cfg_setup( &easypull_cfg );
EASYPULL_MAP_MIKROBUS( easypull_cfg, MIKROBUS_1 );
if ( DIGITAL_OUT_UNSUPPORTED_PIN == easypull_init( &easypull, &easypull_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
if ( EASYPULL_PIN_STATE_HIGH == easypull_get_an_pin( &easypull ) )
{
log_printf( &logger, " AN pin state: HIGH \n" );
}
else
{
log_printf( &logger, " AN pin state: LOW \n" );
}
if ( EASYPULL_PIN_STATE_HIGH == easypull_get_rst_pin( &easypull ) )
{
log_printf( &logger, " RST pin state: HIGH \n" );
}
else
{
log_printf( &logger, " RST pin state: LOW \n" );
}
if ( EASYPULL_PIN_STATE_HIGH == easypull_get_cs_pin( &easypull ) )
{
log_printf( &logger, " CS pin state: HIGH \n" );
}
else
{
log_printf( &logger, " CS pin state: LOW \n" );
}
if ( EASYPULL_PIN_STATE_HIGH == easypull_get_pwm_pin( &easypull ) )
{
log_printf( &logger, " PWM pin state: HIGH \n" );
}
else
{
log_printf( &logger, " PWM pin state: LOW \n" );
}
if ( EASYPULL_PIN_STATE_HIGH == easypull_get_int_pin( &easypull ) )
{
log_printf( &logger, " INT pin state: HIGH \n" );
}
else
{
log_printf( &logger, " INT pin state: LOW \n" );
}
log_printf( &logger, "- - - - - - - - - - - - - \r\n" );
Delay_ms( 1000 );
}
int main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
