Intermediate
30 min

Simplify remote control integration with TSOP98638 and ATmega328P

Infrared mastery

IR 2 Click with Arduino UNO Rev3

Published Feb 14, 2024

Click board™

IR 2 Click

Dev. board

Arduino UNO Rev3

Compiler

NECTO Studio

MCU

ATmega328P

Upgrade your design's user experience with our purpose-built IR solution, designed for simplicity and compactness, making it an ideal choice for projects across various industries, from consumer electronics to smart home automation

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Hardware Overview

How does it work?

IR 2 Click is based on the TSOP98638, a miniaturized sensor for receiving the modulated signal of QEE113 IR emitting diode from Vishay Semiconductors. All Vishay IR receivers have the same circuit architecture consisting of a photodetector, pre-amplifier, and automatic gain control (ACG) to surpass ambient noise with signals transmitted to it with a wavelength of 940nm. This Click board™ represents a compact and easy solution for adding infrared (IR) remote control to your design suitable for IR repeater applications. The infrared signal generates an equivalent photocurrent in the integrated photo PIN diode. The DC part of the signal is blocked in

the bias circuit, and the AC part is passed to a trans-impedance amplifier, followed by an automatic gain-control amplifier and an integrated bandpass filter. A comparator, an integrator, and a Schmitt Trigger stage perform the final signal conditioning. The blocks “Automatic Gain Control” and “Automatic Threshold Control” dynamically control the operating points and the threshold levels required to suppress noise from disturbance sources. The digital output signal has an active-low polarity and consists of an incoming optical burst envelope signal without the carrier frequency. IR 2 Click communicates with the target MCU via selectable

GPIO lines. The selection can be made by positioning SMD jumpers labeled COMM SEL to an appropriate position. The default configuration of this Click board™ allows transmission via the PWM pin of the mikroBUS™ socket and reception via the INT pin, while the other configuration allows communication using TX and RX pins. 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.

IR 2 Click top side image
IR 2 Click bottom side image

Features overview

Development board

Arduino UNO is a versatile microcontroller board built around the ATmega328P chip. It offers extensive connectivity options for various projects, featuring 14 digital input/output pins, six of which are PWM-capable, along with six analog inputs. Its core components include a 16MHz ceramic resonator, a USB connection, a power jack, an

ICSP header, and a reset button, providing everything necessary to power and program the board. The Uno is ready to go, whether connected to a computer via USB or powered by an AC-to-DC adapter or battery. As the first USB Arduino board, it serves as the benchmark for the Arduino platform, with "Uno" symbolizing its status as the

first in a series. This name choice, meaning "one" in Italian, commemorates the launch of Arduino Software (IDE) 1.0. Initially introduced alongside version 1.0 of the Arduino Software (IDE), the Uno has since become the foundational model for subsequent Arduino releases, embodying the platform's evolution.

Arduino UNO Rev3 double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

AVR

MCU Memory (KB)

32

Silicon Vendor

Microchip

Pin count

28

RAM (Bytes)

2048

You complete me!

Accessories

Click Shield for Arduino UNO has two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the Arduino UNO board without effort. The Arduino Uno, a microcontroller board based on the ATmega328P, provides an affordable and flexible way for users to try out new concepts and build prototypes with the ATmega328P microcontroller from various combinations of performance, power consumption, and features. The Arduino Uno has 14 digital input/output pins (of which six can be used as PWM outputs), six analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header, and reset button. Most of the ATmega328P microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the Arduino UNO board with our Click Shield for Arduino UNO, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.

Click Shield for Arduino UNO accessories 1 image

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
NC
NC
RST
NC
NC
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
Transmit Signal
PD6
PWM
Receive Signal
PC3
INT
Transmit Signal
PD0
TX
Transmit Signal
PD1
RX
NC
NC
SCL
NC
NC
SDA
NC
NC
5V
Ground
GND
GND
1

Take a closer look

Click board™ Schematic

IR 2 Click Schematic schematic

Step by step

Project assembly

Click Shield for Arduino UNO front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Arduino UNO Rev3 as your development board.

Click Shield for Arduino UNO front image hardware assembly
Arduino UNO Rev3 front image hardware assembly
Barometer 13 Click front image hardware assembly
Prog-cut hardware assembly
Arduino UNO Rev3 MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Arduino UNO MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

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 IR 2 Click driver.

Key functions:

  • ir2_get_out_pin - This function returns the OUT pin logic state

  • ir2_nec_send_data - This function sends an address and data bytes using NEC protocol

  • ir2_nec_read_data - This function reads an address and data bytes by using NEC protocol

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 IR2 Click example
 *
 * # Description
 * This example demonstrates the use of an IR 2 click board by showing
 * the communication between the two click boards configured as a receiver and transmitter
 * using the NEC protocol.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the driver and logger and displays the selected application mode.
 *
 * ## Application Task
 * Depending on the selected mode, it sends a desired message using NEC protocol or
 * reads all the received data and displays them on the USB UART.
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "ir2.h"

#define IR2_TRANSMITTER_MODE    // Uncomment this line to switch to the transmitter mode

#define IR2_ADDRESS     0xAB
#define IR2_DATA        "MikroE - IR 2 click board\r\n"

static ir2_t ir2;
static log_t logger;

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    ir2_cfg_t ir2_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.
    ir2_cfg_setup( &ir2_cfg );
    IR2_MAP_MIKROBUS( ir2_cfg, MIKROBUS_1 );
    if ( PWM_ERROR == ir2_init( &ir2, &ir2_cfg ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    log_printf( &logger, "- - - - - - - - - - - - \r\n" );
#ifdef IR2_TRANSMITTER_MODE
    log_printf( &logger, "-  Transmitter mode   - \r\n" );
#else
    log_printf( &logger, "-    Receiver mode    - \r\n" );
#endif
    log_printf( &logger, "- - - - - - - - - - - - \r\n" );
    
    log_info( &logger, " Application Task " );
}

void application_task ( void ) 
{
#ifdef IR2_TRANSMITTER_MODE
    log_printf( &logger, " Sending message." );
    
    for ( uint8_t cnt = 0; cnt < sizeof ( IR2_DATA ); cnt++ )
    {
        ir2_nec_send_data ( &ir2, IR2_ADDRESS, IR2_DATA[ cnt ] );
        log_printf( &logger, "." );
    }
    
    log_printf( &logger, "\r\n Message has been sent! \r\n" );
    log_printf( &logger, "- - - - - - - - - - - - \r\n" );
    Delay_ms ( 500 );
#else
    uint8_t address;
    uint8_t rx_data;
    
    if ( IR2_OK == ir2_nec_read_data ( &ir2, &address, &rx_data ) )
    {
        log_printf( &logger, "Address: 0x%.2X, Data: %c\r\n", ( uint16_t ) address, rx_data );
    }
#endif
}

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

Additional Support

Resources

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