Obtain real-time temperature data for various purposes with EMC1414 and PIC18LF45K42

Temperature insight made simple

Published Nov 02, 2023

Click board™

THERMO 5 Click

Dev. board

EasyPIC v8

Compiler

NECTO Studio

MCU

PIC18LF45K42

From industrial processes to everyday applications, our temperature measurement solution offers a reliable and adaptable way to measure temperature in diverse settings

Hardware Overview

How does it work?

Thermo 5 Click is based on the EMC1414, a multiple-channel temperature sensor with beta compensation from Microchip. It features resistance error correction (REC), beta compensation that supports CPU diodes requiring the BJT/transistor models, and, above all, an automatic diode-type detection, which provides a robust solution for complex environmental monitoring applications. The device contains programmable High, Low, and Thermo limits for all measured temperature channels. If the measured temperature goes below the Low limit or above the High limit, the ALERT pin can be

asserted (based on user settings). If the measured temperature meets or exceeds the Thermo Limit, the output pin is asserted unconditionally, providing two tiers of temperature detection. Thermo 5 Click uses a 2-Wire SMBus communication protocol with the host MCU. It has a programmable SMBus address. By setting the INT SEL jumper, you can choose the interrupts from the THM and ALT, which stands for Therm and Alert (the THM is set by default). This way, whenever any of the measured temperatures exceeds programmed limits, the output is asserted. The Alert mode has an interrupt and a

comparator mode of operation. The interrupt mode asserts the output if a faulty diode or out-of-limit measurement is detected. In comparator mode, the output pin will be asserted if the measured temperatures exceed the respective high limit. 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 as a reference for further development.

Features overview

Development board

EasyPIC v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports many high pin count 8-bit PIC microcontrollers from Microchip, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer. 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, EasyPIC v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the EasyPIC v8 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board 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 DEVICE, and CAN are also included, including the well-established mikroBUS™ standard, two display options (graphical and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from the smallest PIC MCU devices with only eight up to forty pins. EasyPIC 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.

Microcontroller Overview

MCU Card / MCU

Architecture

PIC

MCU Memory (KB)

Silicon Vendor

Microchip

Pin count

RAM (Bytes)

2048

Used MCU Pins

mikroBUS™ mapper

RST

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

PWM

Interrupt

RB0

INT

I2C Clock

RC3

SCL

I2C Data

RC4

SDA

Ground

GND

Take a closer look

Click board™ Schematic

Step by step

Project assembly

EasyPIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyPIC v8 as your development board.

NECTO Output Selection Step Image hardware assembly

In the advanced settings, pay special attention to the Redirect standard output field. By default, it is set to Application output as the method of displaying final results. To show results via a UART terminal, select the “UART” option in that field and click the “SAVE” button. You will be returned to the Compiler field, and now you can move on to the next step by pressing the “NEXT” button.

GNSS2 Click front image hardware assembly

GNSS2 Click complete accessories setup image hardware assembly

EasyPIC v8 Access DIPMB 1 - upright/background hardware assembly

NECTO Compiler Selection Step Image hardware assembly

Necto DIP image step 7 hardware assembly

Track your results in real time

Application Output

1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.

2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.

3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.

Software Support

Library Description

This library contains API for THERMO 5 Click driver.

Key functions:

thermo5_read_inter_temp - This function reads measurements made by internal diode.
thermo5_read_extern_1_temp - This function reads measurements made by external 1 diode.
thermo5_read_high_limit_stat - This function reads the High Limit Status register which utilises its lower nibble to represents which diodes have exceed their programmed high limit.

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 
 * \brief THERMO5 Click example
 * 
 * # Description
 * This app measures internal and external temperature.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initalizes device.
 * 
 * ## Application Task  
 * This is an example that shows the most important functions that Thermo 5 Click has.
 *
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "thermo5.h"

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

static thermo5_t thermo5;
static log_t logger;

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

void application_init ( void )
{
    log_cfg_t log_cfg;
    thermo5_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.

    thermo5_cfg_setup( &cfg );
    THERMO5_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    thermo5_init( &thermo5, &cfg );
    Delay_ms ( 500 );
    log_printf( &logger, " Thermo 5 Click ready! \r\n" );
    log_printf( &logger, "-----------------------\r\n" );
    Delay_ms ( 100 );
}

void application_task ( void )
{
    float inter_temp;
    float exter_temp_1;
    float exter_temp_2;
    float exter_temp_3;

    inter_temp = thermo5_read_inter_temp( &thermo5 );
    log_printf( &logger, " Internal temperature :   %.2f \r\n", inter_temp );
    exter_temp_1 = thermo5_read_extern_1_temp( &thermo5 );
    log_printf( &logger, " External temperature 1 : %.2f \r\n", exter_temp_1 );
    exter_temp_2 = thermo5_read_extern_2_temp( &thermo5 );
    log_printf( &logger, " External temperature 2 : %.2f \r\n", exter_temp_2 );
    exter_temp_3 = thermo5_read_extern_3_temp( &thermo5 );
    log_printf( &logger, " External temperature 3 : %.2f \r\n", exter_temp_2 );
    log_printf( &logger, "---------------------------------\r\n" );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

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