Beginner
10 min

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Nano Power 3 Click with Arduino UNO Rev3

Published Feb 14, 2024

Click board™

Nano Power 3 Click

Dev.Board

Arduino UNO Rev3

Compiler

NECTO Studio

MCU

ATmega328

Our outstanding buck converter solution, the pocket-sized powerhouse, transforms voltage seamlessly, providing a reliable and efficient energy source for your projects.

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Hardware Overview

How does it work?

Nano Power 3 Click is based on the RPL-3.0-R, a buck converter with an integrated inductor from Recom Power. This thermally-enhanced converter uses, as input, voltage from 4 up to 18VDC, thus allowing 5V and 12V supply rails to be used. It's fully protected against continuous short circuits, output overcurrent, or over-temperature faults. To set the output voltage on the VOUT terminal, the Nano Power 3 Click uses the MAX5419, a 256-tap nonvolatile digital potentiometer from Analog Devices. This potentiometer features the power-on recall of the wiper position from nonvolatile EEPROM memory. The nominal resistance of this

potentiometer is 200kΩ, and with an onboard resistor, it makes a voltage divider that feeds the feedback input of the buck converter. You select the output voltage value by setting the resistance value on this potentiometer. Nano Power 3 Click uses a standard 2-Wire I2C interface of the MAX5419 to communicate with the host MCU, supporting Fast mode and data rates of up to 400Kbps. The I2C address can be set over the ADDR SEL jumper with 0 selected by default. In addition to the digital potentiometer control, you can also control the buck converter by turning it OFF via the CTR pin. The PG pin serves as the buck

converter Power Good condition output, which interrupts the host MCU according to meeting one of the overvoltage or undervoltage thresholds and sink current capability. The buck converter's output voltage can be read over the AN pin of the mikroBUS™ socket. 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.

Nano Power 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

32

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
NC
NC
RST
NC
NC
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
Converter Enable
PD6
PWM
Power Good Indicator
PC3
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PC5
SCL
I2C Data
PC4
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

Nano Power 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

After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.

Application Output Step 1

After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.

Application Output Step 3

Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.

Application Output Step 4

Software Support

Library Description

This library contains API for Nano Power 3 Click driver.

Key functions:

  • nanopower3_set_ctr_pin - Nano Power 3 set CTRL pin state function.

  • nanopower3_set_wiper_pos - Nano Power 3 set wiper position function.

  • nanopower3_set_voltage - Nano Power 3 set output voltage function.

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 Nano Power 3 Click example
 *
 * # Description
 * This library contains API for the Nano Power 3 Click driver.
 * This driver provides the functions to set the output voltage treshold.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization of I2C module and log UART.
 * After driver initialization, default settings sets output voltage to 1 V.
 *
 * ## Application Task
 * This example demonstrates the use of the Nano Power 3 Click board™ by changing 
 * output voltage every 5 seconds starting from 1 V up to 4.5 V.
 *
 * @author Stefan Ilic
 *
 */

#include "board.h"
#include "log.h"
#include "nanopower3.h"

static nanopower3_t nanopower3;
static log_t logger;

/**
 * @brief Output level printing function.
 * @details This function is used to log value of the selected voltage to UART terminal.
 * @param[in] sel_level : Selected voltage level.
 * @return Nothing.
 * @note None.
 */
static void print_selected_output_level ( uint8_t sel_level );

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    nanopower3_cfg_t nanopower3_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.
    nanopower3_cfg_setup( &nanopower3_cfg );
    NANOPOWER3_MAP_MIKROBUS( nanopower3_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == nanopower3_init( &nanopower3, &nanopower3_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( NANOPOWER3_ERROR == nanopower3_default_cfg ( &nanopower3 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    
    log_info( &logger, " Application Task " );
}

void application_task ( void ) 
{
    for ( uint8_t n_cnt = NANOPOWER3_1V_OUT_VOLTAGE; n_cnt <= NANOPOWER3_4V5_OUT_VOLTAGE; n_cnt++ )
    {
        nanopower3_set_voltage( &nanopower3, n_cnt );
        log_printf( &logger, " Selected output is:" );
        print_selected_output_level ( n_cnt );
        Delay_ms( 5000 );
    }
}

void main ( void ) 
{
    application_init( );

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

static void print_selected_output_level ( uint8_t sel_level )
{
    switch ( sel_level )
    {
        case ( NANOPOWER3_1V_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 1V\r\n" );
            break;
        }
        case ( NANOPOWER3_1V2_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 1.2V\r\n" );
            break;
        }
        case ( NANOPOWER3_1V5_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 1.5V\r\n" );
            break;
        }
        case ( NANOPOWER3_1V8_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 1.8V\r\n" );
            break;
        }
        case ( NANOPOWER3_2V_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 2V\r\n" );
            break;
        }
        case ( NANOPOWER3_2V5_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 2.5V\r\n" );
            break;
        }
        case ( NANOPOWER3_3V_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 3V\r\n" );
            break;
        }
        case ( NANOPOWER3_3V3_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 3.3V\r\n" );
            break;
        }
        case ( NANOPOWER3_3V5_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 3.5V\r\n" );
            break;
        }
        case ( NANOPOWER3_4V_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 4V\r\n" );
            break;
        }
        case ( NANOPOWER3_4V5_OUT_VOLTAGE ):
        {
            log_printf( &logger, " 4.5V\r\n" );
            break;
        }
        default:
        {
            log_printf( &logger, " ERROR\r\n" );
        }
    }
}

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

Additional Support

Resources