MOTION click

MOTION click is a motion detector sensitive only to live bodies. It carries PIR500B, a pyroelectric sensor. The click is designed to run on 3.3V power supply only. It communicates with the target MCU over RST and INT pin on the mikroBUS™ line.

How it works

MOTION click carries PIR500B, a pyroelectric sensor which generates a voltage when exposed to infrared radiation emitted by live bodies (the white plastic Fresnel lens covering the sensor filters visible light).

The signal is processed by a BISS0001 PIR sensor controller which sends an interrupt to the MCU through the mikroBUS INT (out) line.

An onboard potentiometer lets you adjust the detecting range of the sensor (up to 4 meters).

Night only mode

The click also has a night only mode—resoldering a zero-ohm jumper activates the onboard photo resistor which acts as a light-sensitive switch.

You can also switch the sensor ON and OFF by sending a signal from the MCU through the mikroBUS RST pin.

Application

MOTION click is ideal for alarm systems, light switch controllers, and similar systems where human presence needs to be detected.

Key features

• Up to 4m detection range
• Night only mode
• PIR500B pyroelectric sensor
• BISS0001 PIR sensor controller
  • Excellent noise immunity
• Interface: RST, INT pins
• 3.3V power supply

Specification

Pinout diagram

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

Notes	Pin	mikroBUStm				Pin	Notes
Not connected	NC	1	AN	PWM	16	NC	Not connected
Retriggerable and non-retriggerable mode select	MODE	2	RST	INT	15	OUTPUT	Detector output pin
Not connected	NC	3	CS	TX	14	NC	Not connected
Not connected	NC	4	SCK	RX	13	NC	Not connected
Not coneected	NC	5	MISO	SCL	12	NC	Not connected
Not connected	NC	6	MOSI	SDA	11	NC	Not connected
Power supply	+3.3V	7	3.3V	5V	10	+5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Programming

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

This example initializes the sound port, enables the motion sensor and if activated, plays a tone.

01 void Tone1()
02 {
03   Sound_Play(659, 250);        // Frequency = 659Hz, duration = 250ms
04 }
05
06 void Tone2()
07 {
08   Sound_Play(698, 250);        // Frequency = 698Hz, duration = 250ms
09 }
10
11 void Tone3()
12 {
13   Sound_Play(784, 250);        // Frequency = 784Hz, duration = 250ms
14 }
15
16 void main()
17 {
18    ANSELB = 0;                 // Configure PortB pins as digital
19    ANSELC = 0;                 // Configure PortD pins as digital
20    ANSELE = 0;                 // Configure PortE pins as digital
21    TRISB = 0x01;               // Configure RB0 as output
22    TRISC = 0;                  // Set PortC as output
23    LATB = 0x00;                // Reset PortB
24
25    Sound_Init(&PORTC, 2);      // Initialization of sound port
26
27    PORTE.B1 = 1;               // Enable Motion sensor
28
29    while(1)
30    {
31       if (PORTB.B0)
32     {                        // If sensor is activated
33          Tone1();              // Play tone
34       }
35    }
36 }