Deliver accurate and reliable motion detection with minimal false alarm with the ZSLM323511 and PIC32MX470F512H
Dual-element balanced differential pyroelectric (PIR) sensor
Published Jun 10, 2024
Click board™
PIR 2 Click
Dev. board
6LoWPAN clicker
Compiler
NECTO Studio
MCU
PIC32MX470F512H
Provide high-performance and reliable motion detection for various applications requiring accurate presence sensing
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Hardware Overview
How does it work?
PIR 2 Click is based on the ZSLM323511, a dual-element balanced differential pyroelectric (PIR) sensor from Zilog. Designed for high performance and excellent EMI immunity, this sensor is ideal for demanding motion detection applications such as security/intrusion motion detectors, lighting control, video doorbells, and many more. The ZSLM323511 features a low-profile surface mount package compatible with IR reflow processes. It includes two sensing elements behind a spectral filter window tuned to an 8-13um wavelength, blocking out unwanted IR energy sources. With a 0.6mm element spacing, it provides additional white light protection and a typical field of view of 150 degrees from the center of the element on the X-axis and
139 degrees on the Y-axis. Combined with the ZSLM323511, the PIR 2 Click also integrates the ZCWM05GIV1 PIR lens, made from high-density polyethylene. This lens ensures maximum IR transmissivity with well-defined beam patterns. It clips directly into the Click board over the ZSLM323511 sensor, simplifying mechanical design. The MCP607, a micropower CMOS operational amplifier from Microchip, processes the ZSLM323511 raw sensor output. This unity-gain stable, low offset voltage OpAmp features rail-to-rail output swing capability and low input bias current. The buffered signal can be then converted to a digital value using the MCP3221, a 12-bit resolution successive approximation A/D converter
with a 2-wire I2C compatible interface, or it can be sent directly to an analog pin of the mikroBUS™ socket labeled as AN. Additionally, the board allows for signal monitoring at every process stage via test points, from the raw PIR sensor signal on PIR OUT to the amplified signal stages at AMP1 and AMP2 test points. 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.
Features overview
Development board
6LoWPAN Clicker is a compact starter development board that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It comes with an onboard 32-bit PIC microcontroller, the PIC32MX470F512H from Microchip, a USB connector, LED indicators, buttons, a mikroProg connector, and a header for interfacing with external electronics. Along with this microcontroller, the board also contains a 2.4GHz ISM band transceiver, allowing you to add wireless communication to your target application. Its compact design provides a fluid and immersive working experience, allowing access anywhere
and under any circumstances. Each part of the 6LoWPAN Clicker development kit contains the components necessary for the most efficient operation of the same board. In addition to the possibility of choosing the 6LoWPAN Clicker programming method, using USB HID mikroBootloader, or through an external mikroProg connector for PIC, dsPIC, or PIC32 programmer, the Clicker board also includes a clean and regulated power supply module for the development kit. The USB Micro-B connection can provide up to 500mA of current for the Clicker board, which is more than enough to operate all onboard and additional modules, or it can power
over two standard AA batteries. All communication methods that mikroBUS™ itself supports are on this board, including the well-established mikroBUS™ socket, reset button, and several buttons and LED indicators. 6LoWPAN Clicker is an integral part of the Mikroe ecosystem, allowing you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC32
MCU Memory (KB)
512
Silicon Vendor
Microchip
Pin count
64
RAM (Bytes)
131072
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 6LoWPAN clicker 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 PIR 2 Click driver.
Key functions:
pir2_read_raw_adc- This function reads raw ADC value.pir2_read_voltage- This function reads raw ADC value and converts it to proportional voltage level.pir2_set_vref- This function sets the voltage reference for PIR 2 click driver.
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 main.c
* @brief PIR 2 Click Example.
*
* # Description
* This example demonstrates the use of PIR 2 Click boards.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and selects the driver interface.
*
* ## Application Task
* It checks if the sensor has detected movement and displays message on the USB UART.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "pir2.h"
static pir2_t pir2; /**< PIR 2 Click driver object. */
static log_t logger; /**< Logger object. */
#define PIR2_VOLTAGE_TRESHOLD 2.5f
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
pir2_cfg_t pir2_cfg; /**< Click config object. */
/**
* 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 " );
pir2_drv_interface_sel( &pir2_cfg, PIR2_DRV_SEL_I2C );
// Click initialization.
pir2_cfg_setup( &pir2_cfg );
PIR2_MAP_MIKROBUS( pir2_cfg, MIKROBUS_1 );
err_t init_flag = pir2_init( &pir2, &pir2_cfg );
if ( ( ADC_ERROR == init_flag ) || ( I2C_MASTER_ERROR == init_flag ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
float voltage = 0;
pir2_read_voltage ( &pir2, &voltage );
if ( voltage > PIR2_VOLTAGE_TRESHOLD )
{
log_printf( &logger, " Motion detected \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
