Beginner
10 min

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

EasyPull Click with Arduino UNO Rev3

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

A

A

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.

EasyPull Click hardware overview image

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.

Arduino UNO Rev3 double side image

Microcontroller Overview

MCU Card / MCU

default

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.

Click Shield for Arduino UNO accessories 1 image

Used MCU Pins

mikroBUS™ mapper

Analog Output
PC0
AN
Reset / ID SEL
PD2
RST
SPI Select / ID COMM
PB2
CS
SPI Clock
PB5
SCK
SPI Data OUT
PB4
MISO
SPI Data IN
PB3
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
PWM Signal
PD6
PWM
Interrupt
PC3
INT
UART TX
PD0
TX
UART RX
PD1
RX
I2C Clock
PC5
SCL
I2C Data
PC4
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Click board™ Schematic

EasyPull Click Schematic schematic

Step by step

Project assembly

Click Shield for Arduino UNO front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Arduino UNO Rev3 as your development board.

Click Shield for Arduino UNO front image hardware assembly
Arduino UNO Rev3 front image hardware assembly
Barometer 13 Click front image hardware assembly
Prog-cut hardware assembly
Arduino UNO Rev3 MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Arduino UNO MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

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.

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 board

  • easypull_get_rst_pin - This function reads the state of the RST pin of EasyPull click board

  • easypull_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

Additional Support

Resources

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