Intermediate
20 min

Connect and control various types of sensors and actuators with AD74115H, ADP1034 and ATmega328P

From analog signals to digital commands: AD-SWIO shapes your control

AD-SWIO 3 Click with Arduino UNO Rev3

Published Feb 14, 2024

Click board™

AD-SWIO 3 Click

Dev Board

Arduino UNO Rev3

Compiler

NECTO Studio

MCU

ATmega328P

Manage and control different devices in industrial and automation setups, ensuring safety and flexibility in the process

A

A

Hardware Overview

How does it work?

AD-SWIO 3 Click is based on the AD74115H, a single-channel, software-configurable input and output with HART mode, and ADP1034, a 3-channel isolated micropower management unit with seven digital isolators and programmable power control both from Analog Devices. The AD74115H has a single-channel input and output, which can be configured as voltage input, current input, voltage output, current output, digital input, digital output, 2/3/4-wire RTD measurement, or thermocouple measurement input. It features a 16-bit, Σ-Δ analog-to-digital converter (ADC) and a 14-bit digital-to-analog converter (DAC), with a high accuracy 2.5V on-chip reference that can be used both for ADC and DAC. You can connect the desired load to terminals labeled I/OP and I/ON for analog output, analog input, and digital input functions. To apply a stimulus to the two auxiliary high-voltage sense pins, use I/O EXT1 and I/O

EXT2 terminals. The resistance measurements can be made between those four terminals, depending on the number of wires RTD. For instance, take 2-wire resistance measurements between the I/OP and I/ON terminals. The integrated HART modem can transmit and receive signals to and from the I/OP terminal. For more info, check the datasheet. Four LEDs (GPIOA, GPIOB, GPIOC, GPIOD) can be configured in several ways to represent digital input, digital output, external or internal conditions, and more. An onboard thermistor is connected to the AD74115H, which can measure the board's temperature. The ADP1034 provides power and isolation to the AD74115H. A flyback regulator supply voltage of 24V can be applied over the VINP terminal. You can control the flyback regulator slew rate over the SLEW jumper between the slowest and normal as default. You can also choose the highest by leaving the SLEW pin open. The

ZA9644-AED, a flyback transformer from Coilcraft, is used for flyback regulator operation. AD-SWIO 3 Click uses a standard 4-wire SPI serial interface of the AD74115H through the isolation that provides the ADP1034 to communicate with the host MCU. You can reset the AD74115H over the RST pin. When a new sequence of ADC conversion is ready to be read, the RDY will be asserted. Also, the alert ALR pin will be asserted when the alert condition is met. All those lines pass through an isolation barrier of the ADP1034 on its way to the host MCU. 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, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used for further development.

AD-SWIO 3 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

NC
NC
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
Ready Output
PD6
PWM
Alert Interrupt
PC3
INT
NC
NC
TX
NC
NC
RX
NC
NC
SCL
NC
NC
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Schematic

AD-SWIO 3 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
Charger 27 Click front image hardware assembly
Prog-cut hardware assembly
Charger 27 Click complete accessories setup image hardware assembly
Arduino UNO Rev3 Access 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 via Debug Mode

1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.

2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.

DEBUG_Application_Output

Software Support

Library Description

This library contains API for AD-SWIO 3 Click driver.

Key functions:

  • adswio3_get_voltage_input - This function reads the raw ADC value and converts them to a proportional voltage level measured by the voltage between the I/OP and I/ON screw terminals.

  • adswio3_get_diag_res - This function is used to read the desired diagnostic conversion results.

  • adswio3_set_adc_cnv - This function is used to control the ADC conversions that must be performed.

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * @file main.c
 * @brief AD-SWIO 3 Click example
 *
 * # Description
 * This library contains API for the AD-SWIO 3 Click driver 
 * for measurements of the analog output, analog input, digital input, 
 * resistance temperature detector (RTD), and thermocouple measurements.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization of SPI and log UART.
 * After driver initialization, the app executes a default configuration 
 * that enables and sets it to measure IOP/ION voltage input from 0V to 12V, 
 * with 4.8k SPS and enabled four diagnostics measurements (AVDD, VASS, VACC and LVIN).
 *
 * ## Application Task
 * This example demonstrates the use of the AD-SWIO 3 Click board. 
 * The demo application reads and displays the voltage level input, 
 * measured by the voltage between the I/OP and I/ON screw terminals 
 * and NTC thermistor temperature in degrees Celsius.
 * Results are being sent to the UART Terminal, where you can track their changes.
 *
 * @author Nenad Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "adswio3.h"

static adswio3_t adswio3;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    adswio3_cfg_t adswio3_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.
    adswio3_cfg_setup( &adswio3_cfg );
    ADSWIO3_MAP_MIKROBUS( adswio3_cfg, MIKROBUS_1 );
    if ( SPI_MASTER_ERROR == adswio3_init( &adswio3, &adswio3_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( ADSWIO3_ERROR == adswio3_default_cfg ( &adswio3 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    Delay_ms( 100 );

    for ( uint8_t n_cnt = ADSWIO3_GPIO_CONFIG_SEL_A; n_cnt <= ADSWIO3_GPIO_CONFIG_SEL_D; n_cnt ++ )
    {
        if ( ADSWIO3_ERROR == adswio3_set_gpio_config( &adswio3, n_cnt, 
                                                              ADSWIO3_GPIO_CONFIG_GPO_DATA_HIGH, 
                                                              ADSWIO3_GPIO_CONFIG_GP_WK_PD_DIS, 
                                                              ADSWIO3_GPIO_CONFIG_MODE_OUT ) )
        {
            log_error( &logger, " Set GPIO configuration" );
            for ( ; ; );
        }
        Delay_ms( 100 );
    }

    float diag_vtg = 0;
    log_printf( &logger, "_________________________\r\n" );
    log_printf( &logger, " > Diagnostic Voltages <\r\n" );
    if ( ADSWIO3_OK == adswio3_get_diag_vtg( &adswio3, ADSWIO3_DIAG_RESULT_SEL_0, &diag_vtg ) )
    {
        log_printf( &logger, " AVDD: %.2f V\r\n", diag_vtg );
        Delay_ms( 100 );
    }

    if ( ADSWIO3_OK == adswio3_get_diag_vtg( &adswio3, ADSWIO3_DIAG_RESULT_SEL_1, &diag_vtg ) )
    {
        log_printf( &logger, " VASS: %.2f V\r\n", diag_vtg );
        Delay_ms( 100 );
    }

    if ( ADSWIO3_OK == adswio3_get_diag_vtg( &adswio3, ADSWIO3_DIAG_RESULT_SEL_2, &diag_vtg ) )
    {
        log_printf( &logger, " VACC: %.2f V\r\n", diag_vtg );
        Delay_ms( 100 );
    }

    if ( ADSWIO3_OK == adswio3_get_diag_vtg( &adswio3, ADSWIO3_DIAG_RESULT_SEL_3, &diag_vtg ) )
    {
        log_printf( &logger, " LVIN: %.2f V\r\n", diag_vtg );
        Delay_ms( 100 );
    }
    log_printf( &logger, "_________________________\r\n" );
    Delay_ms( 1000 );
}

void application_task ( void )
{
    float ntc_temp = 0, iop_ion_vtg = 0;
    if ( ADSWIO3_OK == adswio3_get_ntc_temp( &adswio3, ADSWIO3_DIAG_RESULT_SEL_3, &ntc_temp ) )
    {
        log_printf( &logger, " NTC Temperature: %.2f degC\r\n", ntc_temp );
        
        Delay_ms( 100 );
    }
    
    if ( ADSWIO3_OK == adswio3_get_voltage_input( &adswio3, 0, &iop_ion_vtg ) )
    {
        log_printf( &logger, "IOP/ION Voltage: %.3f V\r\n", iop_ion_vtg );
        Delay_ms( 100 );
    }
    log_printf( &logger, "_________________________\r\n" );
    Delay_ms( 1000 );
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

// ------------------------------------------------------------------------ END

Additional Support

Resources

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