IR Sense 5 Click

How does it work?

IR Sense 5 Click is based on the ZTP-148SRC1, a thermopile IR sensor from Amphenol. This infrared thermopile sensor is designed for non-contact surface temperature measurement, offering a stable response to DC radiation. The ZTP-148SRC1 can measure temperatures from -20 to +100°C, featuring an active area of 0.7×0.7mm² and a typical field of view (FoV) of 85 degrees. The sensor consists of thermo-elements, a flat IR filter, and a thermistor for temperature compensation, all housed in a hermetically sealed TO package. Its typical applications include human thermometry, non-contact temperature measurement, home appliances such as air conditioners, occupancy detection, HVAC systems, automotive applications, and various other uses.

As mentioned, the ZTP-148SRC1 features a high-sensitivity thermopile with a rapid response time and an integrated thermistor for precise ambient temperature compensation. As an analog-output sensor, it utilizes the OPA2365AIDR OpAmp to amplify the thermopile’s analog output voltage. This amplified signal is then digitized via the I2C interface using the MCP3221 analog-to-digital converter. This board also has an output offset selection achieved via the VREF SEL jumper. Selection is made between a fixed offset value of 200mV, generated by a voltage divider (R11 and R13 resistors) or from the ZTP-148SRC1’s thermistor output. This offset is crucial for signal conditioning, ensuring the sensor’s output is within the optimal range for further processing and improving measurement accuracy by compensating for ambient temperature variations. Besides, the thermistor’s value can be monitored through the AN pin of the mikroBUS™ socket.

The board also includes three test points for signals from the ZTP-148SRC1: the raw signal from the thermopile on TP2, the selected voltage reference at TP3, and the amplified signal from the OPA2365AIDR on TP1. These test points allow consistent prototyping and testing.

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.

Specifications

Pinout diagram

This table shows how the pinout on IR Sense 5 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Thermistor Output	AN	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
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	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

IR Sense 5 Click electrical specifications

Software Support

We provide a library for the IR Sense 5 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 Sense 5 Click driver.

Key functions

• irsense5_get_obj_temp This function reads and calculate object temperature in degree Celsius [degC].

• irsense5_get_amb_temp This function reads and calculate ambient temperature in degree Celsius [degC].

• irsense5_read_raw_adc_thm This function reads the thermistor raw ADC value.

Example Description

This library contains API for the IR Sense 5 Click driver for measuring ambient and object temperature.

void application_task ( void )  
 { 
     float temperature = 0; 
     if ( IRSENSE5_OK == irsense5_get_amb_temp ( &irsense5, &temperature ) ) 
     { 
         log_printf( &logger, " Ambient Temperature: %.2f [degC]rn", temperature ); 
         Delay_ms( 1000 ); 
     } 

     if ( IRSENSE5_OK == irsense5_get_obj_temp ( &irsense5, &temperature ) ) 
     { 
         log_printf( &logger, " Object Temperature:  %.2f [degC]rnn", temperature ); 
         Delay_ms( 1000 ); 
     } 
 }

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.IRSense5

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.