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Access real-time, reliable pressure data with DPS310 and PIC18F2553

Measure the world's pulse: Digital barometric sensor at your service!

Pressure 3 Click with EasyPIC v7a

Published Nov 01, 2023

Click board™

Pressure 3 Click

Development board

EasyPIC v7a

Compiler

NECTO Studio

MCU

PIC18F2553

Navigate the world of meteorology and beyond with confidence, thanks to our advanced digital barometric sensor engineered for accuracy and versatility

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Hardware Overview

How does it work?

Pressure 3 Click is based on the DPS310, a digital barometric pressure sensor from Infineon. This miniaturized sensor, with high accuracy and low power consumption, is capable of measuring not only the pressure but temperature as well in a range of -40 up to 85°C with a half-degree accuracy. Its sensing element is based on a capacitance sensing principle, so it achieves high precision during temperature changes. Each unit for measuring pressure and temperature is individually calibrated, and the internal signal processor converts the outputs to a 24-bit result. The calibration coefficients, stored in registers, convert measurements to high-accuracy values, both for pressure and temperature. The DPS310 integrates a FIFO (First-In-First-Out) buffer that can store the last 32 measurements, which can save power as the host MCU doesn’t have to poll

for results constantly. The DPS310 operates in three operating modes. In Standby mode, as a default mode, no measurements are performed. It is a mode after the Power-on or reset conditions in which all registers and coefficients are accessible. In Command mode (manual), the DPS310 performs one temperature and pressure measurement, after which the sensor returns to Standby mode. The measurement results are available in the data registers. In Background mode (automatic), pressure and/or temperature measurements are continuously performed according to the selected precision and rate. The DPS310 will first perform a pressure measurement and, after that, the temperature measurement. To communicate with the host MCU, the Pressure 3 Click offers a choice between two interfaces, the I2C and the SPI. The selection can be made by

positioning the SMD jumpers labeled SPI I2C to an appropriate position (I2C selected by default). Note that all the jumpers must be placed on the same side, or the Click board™ may become unresponsive. The interrupt function is available over the INT pin only while using this Click board™ via an I2C interface and can be triggered whenever a new measurement is available or if a FIFO buffer is full. 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, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Pressure 3 Click top side image
Pressure 3 Click bottom side image

Features overview

Development board

EasyPIC v7a is the seventh generation of PIC development boards specially designed for the needs of rapid development of embedded applications. It supports a wide range of 8-bit PIC microcontrollers from Microchip and has a broad set of unique functions, such as the first-ever embedded debugger/programmer over USB-C. The development board is well organized and designed so that the end-user has all the necessary elements in one place, such as switches, buttons, indicators, connectors, and others. With four different connectors for each port, EasyPIC v7a allows you to connect accessory boards, sensors, and custom electronics more efficiently than ever. Each part of the EasyPIC v7a 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 various external power sources, including an external 12V power supply, 7-23V AC or 9-32V DC via DC connector/screw terminals, and a power source via the USB Type-C (USB-C) connector. Communication options such as USB-UART and RS-232 are also included, alongside the well-

established mikroBUS™ standard, three display options (7-segment, graphical, and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from PIC10F, PIC12F, PIC16F, PIC16Enh, PIC18F, PIC18FJ, and PIC18FK families. EasyPIC v7a 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.

EasyPIC v7a double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

PIC

MCU Memory (KB)

32

Silicon Vendor

Microchip

Pin count

28

RAM (Bytes)

2048

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
NC
NC
RST
SPI Chip Select
RA5
CS
SPI Clock
RC3
SCK
SPI Data OUT
RC4
MISO
SPI Data IN
RC5
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
Interrupt
RB1
INT
NC
NC
TX
NC
NC
RX
I2C Clock
RC3
SCL
I2C Data
RC4
SDA
NC
NC
5V
Ground
GND
GND
2

Take a closer look

Schematic

Pressure 3 Click Schematic schematic

Step by step

Project assembly

EasyPIC v7a front image hardware assembly

Start by selecting your development board and Click board™. Begin with the EasyPIC v7a as your development board.

EasyPIC v7a front image hardware assembly
Rotary B 2 Click front image hardware assembly
MCU DIP 28 hardware assembly
EasyPIC v7a MB 2 - 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 DIP image step 7 hardware assembly
EasyPIC PRO v7a Display Selection Necto Step 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 Pressure 3 Click driver.

Key functions:

  • pressure3_get_t_p_data - Get temperature pressure

  • pressure3_get_coefficients - Get coefficients

  • pressure3_get_measurement_data - Read the coefficients value for calculation 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 Pressure3 Click example
 * 
 * # Description
 * This application is digital barometric pressure sensor.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initialization device, set default configuration and start to write log.
 * 
 * ## Application Task  
 * This is an example which demonstrates the use of Pressure 3 Click board.
     Measured pressure and temperature data from the DPS310 sensor on Pressure 3 click board.
     Results are being sent to the Usart Terminal where you can track their changes.
     All data logs write on usb uart changes for every 3 sec.
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "pressure3.h"

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

static pressure3_t pressure3;
static log_t logger;

static pressure3_coeff_t coeff_struct;

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

void application_init ( )
{
    log_cfg_t log_cfg;
    pressure3_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.

    pressure3_cfg_setup( &cfg );
    PRESSURE3_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    pressure3_init( &pressure3, &cfg );
    pressure3_default_cfg( &pressure3 );
}

void application_task ( )
{
    float pressure;
    float temperature;

    pressure3_get_t_p_data( &pressure3, &temperature, &pressure, &coeff_struct );
    
    log_printf( &logger, " * Pressure: %.2f mbar * \r\n", pressure );
    log_printf( &logger, " * Temperature: %.2f C * \r\n", temperature );
    log_printf( &logger, " ----------------------- \r\n" );

    Delay_ms( 3000 );
}

void main ( )
{
    application_init( );

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

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

Additional Support

Resources