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mikroSDK Library

Presence click

Rating:

5

Author: MikroElektronika Team

Last Updated: 2019-03-04

Category: Measurement

Downloaded: 33 times

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Presence click is an infrared sensing Click board which can be used for presence sensing, motion detection, and a remote overtemperature protection. Presence click is equipped with the TPiS 1S 1385, a thermophile sensor from CaliPile series.

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mikroSDK Library Blog

Presence click

Presence click

Native view of the Presence click board.

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Presence click

Presence click

Front and back view of the Presence click board.

View full image

Library Description

The library initializes and defines the I2C bus driver and drivers that offer a choice for writing data in register and reads data form register. The library includes function for read Ambient and Object Temperature in C. The user also has the function for start eeprom process for read and storage calibration coefficients, function for general call address and functions for get Interrupt state.

Key functions:

  • uint8_t presence_eepromProcess() - EEPROM process.
  • float presence_ambientTemperature() - Ambient Temperature.
  • float presence_objectTemperature() - Object Temperature.

Examples description

The application is composed of the three sections :

  • System Initialization - Initialization I2C module and sets INT pin as INPUT.
  • Application Initialization - Initializes driver init, start eeprom process and configuration chip for measurement..
  • Application Task - Check whether a new event (Motion, Presence or Temp threshold exceeded) is detected. Waits for valid user input and executes functions based on set of valid commands.

Commands : 'a' - Ambient Temperature 'o' - Object Temperature

void applicationTask()
{
    uint8_t intStatus;
    uint8_t dataReady_;
    char receivedData_;
    char demoText[ 50 ];
    float Tamb;
    float Tobj;

    dataReady_ = UART_Rdy_Ptr( );
    presence_readData(_PRESENCE_REG_INTERRUPT_STATUS, &intStatus, 1);
    
    if (dataReady_ != 0)
    {
        receivedData_ = UART_Rd_Ptr( );

        switch (receivedData_)
        {
            case 'a' :
            {
                Tamb = presence_ambientTemperature();
                FloatToStr(Tamb, demoText);
                mikrobus_logWrite("---- Ambient Temperature: ", _LOG_TEXT);
                mikrobus_logWrite(demoText, _LOG_LINE);
                break;
            }
            case 'o' :
            {
                Tobj = presence_objectTemperature();
                FloatToStr(Tobj, demoText);
                mikrobus_logWrite("---- Object Temperature: ", _LOG_TEXT);
                mikrobus_logWrite(demoText, _LOG_LINE);
                break;
            }
        }
    }
        
    if((intStatus & 0x08) != 0)
    {
        mikrobus_logWrite("--- Presence detected! ---", _LOG_LINE);
    }
    else if((intStatus & 0x04) != 0)
    {
        mikrobus_logWrite("--- Motion detected! ---", _LOG_LINE);
    }
    else if((intStatus & 0x10) != 0)
    {
        mikrobus_logWrite("--- Temp threshold exceeded! ---", _LOG_LINE);
    }

}

Other mikroE Libraries used in the example:

  • I2C
  • UART
  • Conversions

Additional notes and informations

Depending on the development board you are using, you may need USB UART clickUSB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

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