IR Sense click

IR Sense click carries the AK9750 quantum-type IR sensor. The click is designed to run on a 3.3V power supply. It communicates with the target microcontroller over I2C interface, with additional functionality provided by the INT pin on the mikroBUS™ line.

IR Sense cilck detects the temperature of objects and people in motion. It can also detect a human body that remains still. So, it distinguishes heat regardless of the fact whether or not an object is moving.

AK9750 features

The AK9750 is an ultra-low power and compact infrared-ray (IR) sensor module. It is composed of four quantum IR sensors and an integrated circuit (IC) for characteristic compensation.

An integral analog-to-digital converter provides 16-bits data outputs. Additional integrated features include a field of view limiter and an optical filter.

How it works

The IR sensors are arranged as shown. Each sensor detects the diagonal area, as indicated in the image below:

The observable area of the four sensors is as you see it on the silk of the IR Sense click board™.

Specifications

Pinout diagram

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

Notes	Pin					Pin	Notes
	ALR	1	AN	PWM	16	NC
	NC	2	RST	INT	15	INT	Interrupt
Power down pin	PDN	3	CS	TX	14	NC
	NC	4	SCK	RX	13	NC
	NC	5	MISO	SCL	12	SCL	SCL I2C line
	NC	6	MOSI	SDA	11	SDA	SDA I2C line
Power supply	+3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Jumpers and settings

Programming

Code examples for IR Sense click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows the main loop of the IR Sense click example, which reads data every few second and then displays it via UART.

01  while( 1 )
02     {
03         Delay_ms (5000);
04
05
06        IRGRID2_readAll (readData);
07
08        //Upper area sensor value
09         UART2_Write_Text ("rn      ");
10         tempValue = readData [5] + ( readData [6] << 8 );
11         IntToStr (tempValue, uartText);
12         UART2_Write_Text (uartText);
13
14        //Left area sensor value
15         UART2_Write_Text ("rn");
16         tempValue = readData [3] + ( readData [4] << 8 );
17         IntToStr (tempValue, uartText);
18         UART2_Write_Text (uartText);
19         //Right area sensor value
20         UART2_Write_Text ("     ");
21         tempValue = readData [7] + ( readData [8] << 8 );
22         IntToStr (tempValue, uartText);
23         UART2_Write_Text (uartText);
24
25         //Lower area sensor value
26          UART2_Write_Text ("rn      ");
27         tempValue = readData [1] + ( readData [2] << 8 );
28         IntToStr (tempValue, uartText);
29         UART2_Write_Text (uartText);
30         UART2_Write_Text ("rn-------------");
31     }