IR Thermo 4 Click

How does it work?

IR Thermo 4 Click is based on the TPiS 1T 1386 L5.5 H, a high-accuracy thermopile sensor from Excelitas, known for its precise temperature measurements in various applications. This sensor, part of the CaliPile™ family, includes factory-calibrated data stored in its EEPROM, ensuring reliable performance out of the box. It has a narrow 5° field of view (FoV), enclosed in an isothermal TO-39 package for rapid adaptation to ambient temperature changes. Additionally, the integrated lens hood minimizes stray light interference and provides thermal stabilization, making it suitable for use in challenging environmental conditions.

Leveraging advanced thermopile technology, the TPiS 1T 1386 L5.5 H sensor offers much more than conventional remote temperature measurements. It can monitor remote object temperatures with fast over-temperature detection, which is ideal for applications such as remote skin temperature monitoring, over-temperature protection, human presence sensing, motion detection, and passive light barriers for people counting. While temperature calculations are performed on the host using the sensor’s calibration data, the sensor continuously monitors for rapid temperature changes, triggering an over-temperature alert when necessary.

The sensor’s output is digitized using a low-noise, high-resolution ADC, and alongside the reference PTAT temperature channel, the data is stored in the sensor’s RAM, accessible via the I2C interface. A sensor’s filter and event logic unit include multiple low-pass filter options and application-specific processing units, which can be configured to send interrupts to the host system. The factory-calibrated data is crucial for calculating both the sensor’s temperature and the temperature of remote objects, and this data must be recalled after each power-up.

As mentioned, IR Thermo 4 Click uses a standard 2-wire I2C communication protocol to enable the host MCU to control the TPiS 1T 1386 L5.5 H. The I2C interface supports clock frequencies up to 400kHz, with the I2C address selectable via the ADDR SEL jumper. Once configured through the I2C interface, the INT pin allows the host to monitor rapid temperature changes and over-temperature conditions.

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.

Specifications

Pinout diagram

This table shows how the pinout on IR Thermo 4 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
	NC	2	RST	INT	15	INT	Interrupt
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

IR Thermo 4 Click electrical specifications

Software Support

We provide a library for the IR Thermo 4 Click as well as a demo application (example), developed using MIKROE compilers. The demo can run on all the main MIKROE development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on MIKROE github account.

Library Description

This library contains API for IR Thermo 4 Click driver.

Key functions

• irthermo4_read_ambient_temp This function reads and calculates the ambient temperature in degrees Celsius.

• irthermo4_read_object_temp This function reads and calculates the object temperature in degrees Celsius.

• irthermo4_get_int_pin This function returns the INT pin logic state.

Example Description

This example demonstrates the use of IR Thermo 4 Click by reading and displaying the ambient and object temperature measurements.

void application_task ( void ) 
 { 
     float ambient_temp = 0; 
     float object_temp = 0; 
     if ( IRTHERMO4_OK == irthermo4_read_ambient_temp ( &irthermo4, &ambient_temp ) ) 
     { 
         log_printf ( &logger, " Ambient temperature: %.2f degCrn", ambient_temp ); 
         if ( IRTHERMO4_OK == irthermo4_read_object_temp ( &irthermo4, &object_temp, ambient_temp ) ) 
         { 
             log_printf ( &logger, " Object temperature: %.2f degCrnn", object_temp ); 
         } 
     } 
     Delay_ms ( 500 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on MIKROE github account.

Other MIKROE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.IRThermo4

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MIKROE compilers.

mikroSDK

This Click board™ is supported with mikroSDK – MIKROE Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.