Thermostat 3 Click

Thermostat 3 Click is a general-purpose thermostat Click board™ designed to be used with any temperature sensor based on the MAX31855 sensor design.

Click Product page

Click library

• Author : MikroE Team
• Date : Jan 2020.
• Type : SPI type

Software Support

We provide a library for the Thermostat3 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Thermostat3 Click driver.

Standard key functions :

• Config Object Initialization function.

  void thermostat3_cfg_setup ( thermostat3_cfg_t *cfg );

• Initialization function.

  THERMOSTAT_RETVAL thermostat3_init ( thermostat3_t ctx, thermostat3_cfg_t cfg );

• Click Default Configuration function.

  void thermostat3_default_cfg ( thermostat3_t *ctx );

Example key functions :

• This function enables control of the relay.

  void thermostat3_relay_control ( thermostat3_t *ctx, uint8_t relay_pos );

• This function returns Fault data Value.

  uint8_t thermostat3_get_fault_data ( temp_vals_t *tmp, uint8_t err );

• This function returns 14-Bit Thermocouple Temperature Data

  float thermostat3_get_thermocouple_temperature ( temp_vals_t *tmp, uint8_t temp_in );

Examples Description

This application enables usage of the general purpose Thermostat Click to be used with temperature sensors.

The demo application is composed of two sections :

Application Init

Initialization driver init

void application_init ( void )
{
    log_cfg_t log_cfg;
    thermostat3_cfg_t cfg;

    /** 
     * 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 ----" );

    Delay_ms ( 100 );

    //  Click initialization.

    thermostat3_cfg_setup( &cfg );
    THERMOSTAT3_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    thermostat3_init( &thermostat3, &cfg );

    // Power on delay
    Delay_ms ( 200 );
    log_printf( &logger, "---- Start Thermostat 3 ----\r\n" );
}

Application Task

Waits for valid user input and executes functions based on set of valid commands

void application_task ( void )
{
    //  Task implementation.

    float internal_temp;
    float thermocouple_temp;

    thermostat3_process( &thermostat3, &temp_val );

    internal_temp = thermostat3_get_internal_temperature( &temp_val, THERMOSTAT3_TEMP_IN_CELSIUS );
    log_printf( &logger, "# Internal Temperature: %.2f", internal_temp );
    Delay_ms ( 200 );

    thermocouple_temp = thermostat3_get_thermocouple_temperature( &temp_val, THERMOSTAT3_TEMP_IN_CELSIUS );
    log_printf( &logger, "# Thermocouple Temperature: %.2f", thermocouple_temp );
    Delay_ms ( 200 );

    if( thermostat3.relay_flag == 1)
    {
        thermostat3.relay_flag = 0;
        thermostat3_relay_control( &thermostat3, THERMOSTAT3_RELAY_OFF );
        log_printf( &logger, "# Relay OFF\r\n" );
    }
    else
    {
        thermostat3.relay_flag = 1;
        thermostat3_relay_control( &thermostat3, THERMOSTAT3_RELAY_ON );
        log_printf( &logger, "# Relay ON\r\n" );
    }
    Delay_ms ( 200 );

    if( thermostat3.fault_flag == 1 )
    {
        thermostat3.fault_flag = 0;
        log_printf( &logger, "# Fault status -- OFF\r\n" );
    }
    else
    {
        thermostat3.fault_flag = 1;
        log_printf( &logger, "# Fault status -- ON\r\n" );
    }
    Delay_ms ( 200 );

    if( thermostat3.fault_flag == 1 )
        {
            thermostat3.f_error++;
            if( thermostat3.f_error > 3 )
            {
                thermostat3.f_error = 0;
            }
            display_fault( thermostat3.f_error );

            thermostat3.fault_status = thermostat3_get_fault_data( &temp_val, 0x01 << thermostat3.f_error );

            if ( thermostat3.fault_status == 1 )
            {
                log_printf( &logger, " -- ERROR\r\n" );
            }
            else
            {
                log_printf( &logger, " -- OK\r\n" );
            }
        }
}

Note

• Additional Functions : -void _displayFault( uint8_t f_error ) - Display fault

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Thermostat3

Additional notes and informations

Depending on the development board you are using, you may need USB UART Click, USB 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.