30 min

Unlock the full potential of any battery with SPV1050 and PIC32MX764F128L

Embrace the future of battery charging

Peltier Click with UNI-DS v8

Published Jul 01, 2023

Click board™

Peltier Click

Development board



NECTO Studio



Charge any battery type, including lithium-based, solid-state thin film and super-capacitor



Hardware Overview

How does it work?

Peltier Click is based on the SPV1050, an ultralow power energy harvester and battery charger from STMicroelectronics that can charge lithium-based batteries. A thermoelectric harvester produces green energy for energy harvesting with many advantages: maintenance-free because of the use of a highly reliable and compact solid-state device; silent and quiet; highly efficient in environmental terms because the heat is harvested from waste heat sources and converted into electricity. Because of this feature, the Peltier click can be used for various applications such as WSN, HVAC, building and home automation, industrial control, remote metering, lighting, security, surveillance, and wearable and biomedical sensors. The SPV1050 is an ultralow power and high-efficiency energy harvester and battery charger, which implements the MPPT function and integrates the switching elements of a buck-boost converter. The SPV1050 device allows the charge of a lithium

battery by tightly monitoring the end-of-charge and the minimum battery voltage to avoid over-discharge and preserve the battery life. The power manager is suitable for TEG harvesting sources, as it covers the input voltage range from 75 mV up to 18 V and guarantees high efficiency in both buck-boost and boost configurations. Furthermore, the SPV1050 device shows very high flexibility thanks to the trimming capability of the end-of-charge and undervoltage protection voltages. In such a way, any source and battery are matched. The MPPT is programmable by a resistor input divider and allows maximizing the source power under any temperature and irradiance condition. Some of the key features of the SPV1050 are its transformerless thermoelectric generators and PV modules energy harvester, high efficiency for any harvesting source, and up to 70 mA maximum battery charging current. It is a fully integrated buck-boost DC-DC converter with a

programmable MPPT by external resistors, 2.6 V to 5.3 V trimmable battery charge voltage level (± 1% accuracy), 2.2 V to 3.6 V trimmable battery discharge voltage level (± 1% accuracy) with two fully independent LDOs (1.8 V and 3.3 V output). The SPV1050 can turn LDO control pins on/off, and it has a battery disconnect function for battery protection while the battery is connected and ongoing charge logic open drain indication pins. The SPV1050 is an ultralow power energy harvester with an embedded MPPT algorithm, a battery charger, and a power manager designed for applications up to 400 mW. This Click board™ can only be operated with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Peltier Click hardware overview image

Features overview

Development board

UNI-DS v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different STM32, Kinetis, TIVA, CEC, MSP, PIC, dsPIC, PIC32, and AVR MCUs regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. 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, UNI-DS v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the UNI-DS v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it 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

HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. UNI-DS 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.

UNI-DS v8 horizontal image

Microcontroller Overview

MCU Card / MCU



8th Generation



MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


You complete me!


Li-Polymer Battery is the ideal solution for devices that demand a dependable and long-lasting power supply while emphasizing mobility. Its compatibility with mikromedia boards ensures easy integration without additional modifications. With a voltage output of 3.7V, the battery meets the standard requirements of many electronic devices. Additionally, boasting a capacity of 2000mAh, it can store a substantial amount of energy, providing sustained power for extended periods. This feature minimizes the need for frequent recharging or replacement. Overall, the Li-Polymer Battery is a reliable and autonomous power source, ideally suited for devices requiring a stable and enduring energy solution. You can find a more extensive choice of Li-Polymer batteries in our offer.

Peltier Click accessories image

Used MCU Pins

mikroBUS™ mapper

Enable 3.3V LDO
Enable 1.8V LDO
Power Supply
Chare Indicator
Battery Connection Indicator

Take a closer look


Peltier Click Schematic schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the UNI-DS v8 as your development board.

Fusion for PIC v8 front image hardware assembly
GNSS2 Click front image hardware assembly
SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly
GNSS2 Click complete accessories setup image hardware assembly
v8 SiBRAIN 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 Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for Peltier Click driver.

Key functions:

  • peltier_enable_ldo2 - Enables LDO2 function

  • peltier_disable_ldo2 - Disables LDO2 function

  • peltier_battery_charge - Check ongoing battery charge flag pin 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 
 * \brief Peltier Click example
 * # Description
 * This application is ultralow power energy harvester and battery charger.
 * The demo application is composed of two sections :
 * ## Application Init 
 * Initializes GPIO driver, disables both 1.8V and 3.3V outputs and starts write log.
 * ## Application Task  
 * This example demonstrates the use of Peltier Click board by first enableing 1.8V output, second 
   by enableing 3.3V output, then enabling both outputs and finally disabling both outputs in 5 seconds intervals.
 * \author MikroE Team
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "peltier.h"

// ------------------------------------------------------------------ VARIABLES

static peltier_t peltier;
static log_t logger;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
    log_cfg_t log_cfg;
    peltier_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.

    peltier_cfg_setup( &cfg );
    peltier_init( &peltier, &cfg );

void application_task ( void )
    log_printf( &logger, "   1.8V output    \r\n" );
    log_printf( &logger, "------------------\r\n" );
    peltier_enable_ldo1( &peltier );
    peltier_disable_ldo2( &peltier );
    Delay_ms( 5000 );
    log_printf( &logger, "   3.3V output    \r\n" );
    log_printf( &logger, "------------------\r\n" );
    peltier_disable_ldo1( &peltier );
    peltier_enable_ldo2( &peltier );
    Delay_ms( 5000 );
    log_printf( &logger, "   Both outputs   \r\n" );
    log_printf( &logger, "------------------\r\n" );
    peltier_enable_ldo1( &peltier );
    peltier_enable_ldo2( &peltier );
    Delay_ms( 5000 );
    log_printf( &logger, " Disable  outputs \r\n" );
    log_printf( &logger, "------------------\r\n" );
    peltier_disable_ldo1( &peltier );
    peltier_disable_ldo2( &peltier );
    Delay_ms( 5000 );

void main ( void )
    application_init( );

    for ( ; ; )
        application_task( );

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

Additional Support