Library Description

The library contains the One Wire functions for full communication from MCU to one of the DS18k20 sensors. The user also has a relay management function available.

Key functions:

• void thermostat2_relay(uint8_t state) - Relay control
• void thermostat2_oneWireReset() - One Wire Reset
• void thermostat2_oneWireWrite(uint8_t dataIn) - One Wire Write
• uint8_t thermostat2_oneWireRead() - One Wire Read

Examples description

The application is composed of the three sections :

• System Initialization - Sets CS pin as OUTPUT for control of the relay
• Application Initialization - Initialization driver init and sets relay state on OFF
• Application Task - Waits for valid user input and executes functions based on set of valid commands

Commands : '+' - Relay ON '-' - Relay OFF 't' - Reads and display Temperature

void applicationTask()
{
    float Temperature;
    char demoText[50];
    
    uint8_t dataReady_;
    char receivedData_;

    dataReady_ = UART_Rdy_Ptr( );

    if (dataReady_ != 0)
    {
        receivedData_ = UART_Rd_Ptr( );

        switch (receivedData_)
        {
            case '+' :
            {
                mikrobus_logWrite(" Relay ON!!! ", _LOG_LINE);
                thermostat2_relay(_THERMOSTAT2_RELAY_STATE_ON);
                break;
            }
            case '-' :
            {
                mikrobus_logWrite(" Relay OFF!!! ", _LOG_LINE);
                thermostat2_relay(_THERMOSTAT2_RELAY_STATE_OFF);
                break;
            }
            case 't' :
            {
                Temperature = thermostat2_getTemperature();
                FloatToStr(Temperature, demoText);
                mikrobus_logWrite("Temperature : ", _LOG_TEXT);
                mikrobus_logWrite(demoText, _LOG_TEXT);
                mikrobus_logWrite(" C ", _LOG_LINE);
                break;
            }
        }
    }
}

Additional Functions :

• void thermostat2_getTemperature( ) - Reads Temperature (DS18S20)

Other mikroE Libraries used in the example:

• One_Wire
• UART
• Conversions

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.