Transform the motion into a symphony of thermal data using AK9754 and STM32F091RC
Temperature tracking, on the move: Your instant heat signature solution
Published Feb 26, 2024
Click board™
IR Sense 3 Click
Dev. board
Nucleo-64 with STM32F091RC MCU
Compiler
NECTO Studio
MCU
STM32F091RC
Our innovative motion-temperature detection solution provides a rapid and reliable means to monitor temperatures for objects and individuals, ensuring safety and efficiency.
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Hardware Overview
How does it work?
IR Sense 3 Click is based on the AK9754, an ultra-small infrared sensor with an I2C interface from AKM. The sensor IC integrates the AKM’s original InSb quantum IR sensor element - used to sense the IR spectrum light, analog front end - for the signal conditioning and the sensor offset canceling, 16-bit analog to digital converter (ADC) - used to convert temperature and IR sensor voltages into a digital information, the digital lowpass filter (LPF) with the selectable cut-off frequency, and finally - the communication I2C interface. Power on Reset section as well as the internal oscillator sections are integrated on this chip, as well. The chip comes with the factory calibrated offset, making the IR Sense 3 click ready to be used out of the box. The sensor data is output through the I2C bus, with its pins routed to the appropriate mikroBUS™ pins. The I2C interface supports both normal (clock speed up to 100kHz) and fast mode
(clock speed up to 400kHz). IR Sense 3 click can be operated in two modes: Stand-By and Continuous mode. In Stand-By mode, all the internal sections are powered down. The data output registers retain their content, and it is available for reading. The interrupt pin reverts to its initial state. In this mode, the power consumption is minimal. In Continuous mode, the sensor will repeat the measurement every 100ms. The information in the output register will be updated after each completed conversion. The programmable interrupt engine can be used to trigger an interrupt request, whenever the programmed criteria are met. The interrupt will be triggered by all the events that meet the programmed criteria; The interrupt pin of the AK9754 is routed to the INT pin of the mikroBUS™ and it is driven to a LOW logic state when it is triggered. It is pulled to a HIGH logic level by the onboard resistor. More about I2C communication and the
interrupt sources can be found in the AK9754 datasheet. IR Sense 3 click supports the I2C communication interface, allowing it to be used with a wide range of different MCUs. The slave I2C address can be configured by two SMD jumpers, labeled as ADDR0 and ADDR1. Because both address selection pins are tri-state, SMD jumpers can be used to short the pin to VCC or GND, or can be remove to leave the address selection pin floating. Thanks to that, up to eight devices can be used on the same I2C bus. 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
Nucleo-64 with STM32F091RC MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin
headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is
provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M0
MCU Memory (KB)
256
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
32768
You complete me!
Accessories
Click Shield for Nucleo-64 comes equipped with two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the STM32 Nucleo-64 board with no effort. This way, Mikroe allows its users to add any functionality from our ever-growing range of Click boards™, such as WiFi, GSM, GPS, Bluetooth, ZigBee, environmental sensors, LEDs, speech recognition, motor control, movement sensors, and many more. More than 1537 Click boards™, which can be stacked and integrated, are at your disposal. The STM32 Nucleo-64 boards are based on the microcontrollers in 64-pin packages, a 32-bit MCU with an ARM Cortex M4 processor operating at 84MHz, 512Kb Flash, and 96KB SRAM, divided into two regions where the top section represents the ST-Link/V2 debugger and programmer while the bottom section of the board is an actual development board. These boards are controlled and powered conveniently through a USB connection to program and efficiently debug the Nucleo-64 board out of the box, with an additional USB cable connected to the USB mini port on the board. Most of the STM32 microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the STM32 Nucleo-64 board with our Click Shield for Nucleo-64, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
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 Nucleo-64 with STM32F091RC MCU 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 IR Sense 3 Click driver.
Key functions:
irsense3_human_approach_detect- Human approach detectionirsense3_get_ir_sensor_data- Output current of IR sensorirsense3_get_interrupt_state- Get Interrupt state
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 IrSense3 Click example
*
* # Description
* Demo application shows detection of human and reading of
* other parameters such as IR current ..
*
* The demo application is composed of two sections :
*
* ## Application Init
* Configuring Clicks and log objects.
* Software reset and settings the Click in the default configuration.
*
* ## Application Task
* Reads temperature data, outputs current of IR Sensor and checks for human approach.
*
* \author Katarina Perendic
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "irsense3.h"
// ------------------------------------------------------------------ VARIABLES
static irsense3_t irsense3;
static log_t logger;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
irsense3_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.
irsense3_cfg_setup( &cfg );
IRSENSE3_MAP_MIKROBUS( cfg, MIKROBUS_1 );
irsense3_init( &irsense3, &cfg );
// Software reset
log_info( &logger, "---- Software reset ----" );
irsense3_software_reset( &irsense3 );
Delay_ms ( 1000 );
// Configuration
log_info( &logger, "---- Default config ----" );
irsense3_default_cfg( &irsense3 );
}
void application_task ( void )
{
float temperature;
float ir_current_data;
uint8_t f_detect;
// Detection Object
f_detect = irsense3_human_approach_detect( &irsense3 );
if ( f_detect != 0 )
{
log_printf( &logger, ">> Human Approach detected !!!\r\n" );
Delay_ms ( 1000 );
}
// Output current of IR sensor
ir_current_data = irsense3_get_ir_sensor_data( &irsense3 );
log_printf( &logger, ">> IR current data: %.2f pA.\r\n", ir_current_data );
// Temperature
temperature = irsense3_get_temperature_data( &irsense3 );
log_printf( &logger, ">> Temperature: %.2f C.\r\n", temperature );
log_printf( &logger, "----------------------------\r\n" );
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
