Harness real-time pressure, humidity, and temperature data with MS8607 and PIC18LF46K40
Your complete PHT measurement solution!
Published Aug 25, 2023
Click board™
PHT Click
Dev. board
EasyPIC v8
Compiler
NECTO Studio
MCU
PIC18LF46K40
Gain a competitive edge by utilizing accurate PHT measurements to monitor and adjust manufacturing conditions, resulting in improved product quality and streamlined production
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Hardware Overview
How does it work?
PHT Click is based on the MS8607, a digital combination sensor providing three environmental measurements: pressure, humidity, and temperature from TE Connectivity. The MS8607 includes two sensors based on MEMS technologies that measure pressure, humidity, and temperature. The first is a piezo-resistive sensor providing pressure and temperature measurements, and the second is a capacitive humidity sensor providing relative humidity measurement. Each sensor is interfaced to a ΔΣ ADC integrated circuit for digital conversion. The MS8607 converts analog output voltages to a 24-bit digital value for the pressure and temperature measurements and a 12-bit digital value for the
relative humidity measurement. Pressure measurement accuracy comes in at +/- 2mbar, relative humidity at +/- 3% RH, and the temperature within 1°C. One standout feature of the MS8607 is its very respectable low power consumption at as low as 0.78 µA. Perfect for sensing general weather conditions, the MS8607 shines for high-altitude, low-pressure applications. Capable of sensing down to 10 bar, the MS8607 is simple to use and gives the user some powerful readings with very little power and conversion time. PHT Click communicates with MCU using the standard I2C 2-Wire interface with a maximum clock frequency of 400kHz. Since the sensor is supplied with 3.3V logic voltage level only, also
featured on this Click board™ is a PCA9306 voltage-level translator from Texas Instruments. The I2C interface bus lines are routed to the dual bidirectional voltage-level translator, allowing this Click board™ to be interfaced with both 3.3V and 5V MCUs. 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.
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)
64
Silicon Vendor
Microchip
Pin count
40
RAM (Bytes)
3728
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the EasyPIC v8 as your development board.
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 PHT Click driver.
Key functions:
pht_set_ratio- Set Ratio functionpht_get_temperature_pressure- Get temperature and pressure functionpht_get_relative_humidity- Get humidity function
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 main.c
* @brief PHT Click example
*
* # Description
* This is an example that demonstrates the use of the PHT Click board.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization driver enables - I2C,
* performs the device reset and determines the oversampling ratio,
* also write log.
*
* ## Application Task
* PHT Click board can be used to measure Pressure, Temperature
* and Relative Humidity.
* All data logs write on USB uart changes every 3 sec.
*
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "pht.h"
static pht_t pht;
static log_t logger;
float pressure;
float humidity;
float temperature;
void application_init ( void ) {
log_cfg_t log_cfg; /**< Logger config object. */
pht_cfg_t pht_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.
pht_cfg_setup( &pht_cfg );
PHT_MAP_MIKROBUS( pht_cfg, MIKROBUS_1 );
err_t init_flag = pht_init( &pht, &pht_cfg );
if ( I2C_MASTER_ERROR == init_flag ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
log_printf( &logger, "---------------------------- \r\n " );
log_printf( &logger, " Device reset \r\n" );
pht_reset( &pht );
Delay_ms( 100 );
log_printf( &logger, "---------------------------- \r\n " );
log_printf( &logger, " Set Oversampling Ratio \r\n" );
pht_set_ratio( &pht, PHT_PT_CMD_RATIO_2048, PHT_PT_CMD_RATIO_2048);
Delay_ms( 100 );
log_printf( &logger, "---------------------------- \r\n " );
log_info( &logger, " Application Task " );
log_printf( &logger, "---------------------------- \r\n " );
}
void application_task ( void ) {
pht_get_temperature_pressure( &pht, &temperature, &pressure );
Delay_ms( 10 );
pht_get_relative_humidity( &pht, &humidity );
Delay_ms( 10 );
log_printf( &logger, " Preassure : %.2f mbar \r\n ", pressure );
log_printf( &logger, " Humidity : %.2f %% \r\n ", humidity );
log_printf( &logger, " Temperature : %.2f C \r\n ", temperature );
log_printf( &logger, "---------------------------- \r\n " );
Delay_ms( 3000 );
}
void main ( void ) {
application_init( );
for ( ; ; ) {
application_task( );
}
}
// ------------------------------------------------------------------------ END
