Enhance user experiences based on ambient conditions with TSL2572 and PIC32MZ2048EFM100
Illuminating insights
Published Sep 19, 2023
Click board™
Ambient 17 Click
Dev. board
Curiosity PIC32 MZ EF
Compiler
NECTO Studio
MCU
PIC32MZ2048EFM100
Utilize ambient light intensity sensing to create energy-efficient lighting systems that adapt to the environment, reducing operational costs and environmental impact
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Hardware Overview
How does it work?
Ambient 17 Click is based on the TSL2572, a high-sensitivity light-to-digital converter that transforms light intensity into a digital output signal from ams AG. The TSL2572 provides ambient light sensing (ALS) that approximates the human eye response to light intensity under various lighting conditions and through various attenuation materials. Accurate ALS measurements result from dual-diode technology and the UV rejection filter incorporated in the package. In addition, the TSL2584TSV can detect a wide range of precise lux measurements up to 60klx, even when mounted behind dark glass.
It also has stable performance over a wide temperature range, suitable for measuring the present ambient light. Ambient 17 Click communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting Standard Mode operation with a clock frequency of 100kHz and Fast Mode up to 400kHz. It also possesses an additional interrupt signal, routed on the INT pin of the mikroBUS™ socket labeled as INT, indicating when a specific interrupt event occurs, such as detecting a meaningful change in light intensity. An interrupt is generated when an ALS
conversion's value exceeds an upper or lower threshold. In addition, a programmable interrupt persistence feature allows the user to determine how many consecutive exceeded thresholds are necessary to trigger an interrupt. 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.
Features overview
Development board
Curiosity PIC32 MZ EF development board is a fully integrated 32-bit development platform featuring the high-performance PIC32MZ EF Series (PIC32MZ2048EFM) that has a 2MB Flash, 512KB RAM, integrated FPU, Crypto accelerator, and excellent connectivity options. It includes an integrated programmer and debugger, requiring no additional hardware. Users can expand
functionality through MIKROE mikroBUS™ Click™ adapter boards, add Ethernet connectivity with the Microchip PHY daughter board, add WiFi connectivity capability using the Microchip expansions boards, and add audio input and output capability with Microchip audio daughter boards. These boards are fully integrated into PIC32’s powerful software framework, MPLAB Harmony,
which provides a flexible and modular interface to application development a rich set of inter-operable software stacks (TCP-IP, USB), and easy-to-use features. The Curiosity PIC32 MZ EF development board offers expansion capabilities making it an excellent choice for a rapid prototyping board in Connectivity, IOT, and general-purpose applications.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC32
MCU Memory (KB)
2048
Silicon Vendor
Microchip
Pin count
100
RAM (Bytes)
524288
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 Curiosity PIC32 MZ EF 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 Ambient 17 Click driver.
Key functions:
ambient17_get_int_pin- This function returns the INT pin logic stateambient17_set_atime- This function sets the ATIME register for the selected ALS integration timeambient17_measure_light_level- This function reads the raw ADC data from two channels and then measures the light level in lux based on those readings
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 Ambient17 Click example
*
* # Description
* This example demonstrates the use of Ambient 17 click board by measuring
* the ambient light level in Lux.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the click default configuration.
*
* ## Application Task
* Waits for the data ready interrupt, then reads the ambient light level in Lux
* and displays the results on the USB UART. By default, the data ready interrupt triggers
* upon every ADC cycle which will be performed every 200ms.
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "ambient17.h"
static ambient17_t ambient17;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
ambient17_cfg_t ambient17_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 " );
// Click initialization.
ambient17_cfg_setup( &ambient17_cfg );
AMBIENT17_MAP_MIKROBUS( ambient17_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == ambient17_init( &ambient17, &ambient17_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( AMBIENT17_ERROR == ambient17_default_cfg ( &ambient17 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
if ( !ambient17_get_int_pin ( &ambient17 ) )
{
uint16_t lux;
if ( AMBIENT17_OK == ambient17_measure_light_level ( &ambient17, &lux ) )
{
log_printf ( &logger, " Ambient light level [Lux]: %u\r\n\n", lux );
}
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
