Stay cool and dry with real-time climate insights using SHT21 and TM4C1294NCPDT
Don't sweat it – track temperature and humidity effortlessly
Published Nov 07, 2023
Click board™
Temp&Hum 8 Click
Dev Board
Fusion for Tiva v8
Compiler
NECTO Studio
MCU
TM4C1294NCPDT
Our goal is to help you create the perfect climate for success, maximizing productivity, and focus by offering intelligent climate monitoring solutions for your home or workplace
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Hardware Overview
How does it work?
Temp&Hum 8 Click is based on the SHT21, a humidity and temperature digital sensor from Sensirion. This sensor is factory calibrated, allowing down to ±2% relative humidity tolerance (RH) and ±0.3°C thermal tolerance. However, the RH measurement of the sensor is affected by the temperature, therefore it is required to use the sensor at the temperature of the air, in which the humidity is measured. The humidity accuracy is also affected by the RH percentage: if both temperature and humidity are placed on a graph, it is possible to get a diagram of the RH accuracy as the function of RH percentage and temperature. The SHT21 IC is based on the CMOSens® technology, featuring the capacitive RH
sensor and the bandgap temperature sensor. Besides the sensing elements, the IC incorporates an analog front end (AFE), which consists of A/D converter, OTP memory, and a logic section. The integrated A/D converter can be programmatically selected from the lowest 8/12-bit resolution, up to resolutions of 12/14 bits. The resolution selection affects the power consumption, as well as the data output rate. The response time might vary between 3ms for 8-bit resolution, up to 29ms for 14-bit resolution, for the RH readings. The resolution selection can be set within the so-called User register. The SHT21 sensor also features an integrated heating element, used to evaporate condensation. The heating
element can be simply activated by setting a bit in the User register. In the case when the heater is powered on, the power consumption might rise above the typical values. The SHT21 sensor is also equipped with the brown-out status bit, located in the User register. This bit indicates the low power voltage: if the voltage drops below 2.25V, this bit will be set to 1, indicating a brown-out condition. 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.
Features overview
Development board
Fusion for TIVA 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 32-bit ARM® Cortex®-M based MCUs from Texas Instruments, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over a WiFi network. 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, Fusion for TIVA v8 provides a fluid and immersive working experience, allowing access
anywhere and under any circumstances at any time. Each part of the Fusion for TIVA 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. Fusion for TIVA 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
Type
8th Generation
Architecture
ARM Cortex-M4
MCU Memory (KB)
1024
Silicon Vendor
Texas Instruments
Pin count
128
RAM (Bytes)
262144
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Fusion for Tiva v8 as your development board.
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.
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.
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".
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.
Software Support
Library Description
This library contains API for Temp&Hum 8 Click driver.
Key functions:
temphum8_get_temperature_data- Temperature datatemphum8_get_humidity_data- Relative Huminidy datatemphum8_set_cfg_register- Configuration device for measurement
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 TempHum8 Click example
*
* # Description
* This demo-app shows the temperature measurement procedure using Temp&Hum 8 click.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Configuring clicks and log objects.
* Setting the click in the default configuration to start the measurement,
* and before that call function software_reset().
*
* ## Application Task
* Reads ambient temperature data and Relative Huminidy data,
* this data logs to USBUART every 1500ms.
*
* \author Katarina Perendic
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "temphum8.h"
// ------------------------------------------------------------------ VARIABLES
static temphum8_t temphum8;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
temphum8_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.
temphum8_cfg_setup( &cfg );
TEMPHUM8_MAP_MIKROBUS( cfg, MIKROBUS_1 );
temphum8_init( &temphum8, &cfg );
temphum8_software_reset( &temphum8 );
temphum8_default_cfg( &temphum8 );
}
void application_task ( void )
{
float temperature;
float humidity;
// Task implementation.
log_printf( &logger, "\r\n ---- Ambient data ----\r\n" );
temperature = temphum8_get_temperature_data( &temphum8, TEMPHUM8_TEMPERATURE_IN_CELSIUS );
log_printf( &logger, "** Temperature: %.2f °C \r\n", temperature );
humidity = temphum8_get_humidity_data( &temphum8 );
log_printf( &logger, "** Humidity: %.2f %%RH \r\n", humidity );
Delay_ms( 1500 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
