Library Description

Library performs a control of the Temp Probe Click board™ and performs a configuration on which way temperature be measured. Library offers a choice to measure temperature on the desired channel/channels, depending on the cold junction channel. The device can use a lot of different sensors for measurement, such as thermocouples, diodes, sense resistors, thermistors... For more details check documentation.

Key functions:

• uint8_t tempprobe_write_byte( uint16_t reg_addr, uint8_t data_in ) - .
• uint8_t tempprobe_read_word( uint16_t reg_addr, uint32_t *data_out ) - .
• uint8_t tempprobe_write_eeprom( void ) - Function writes the current settings from the chip registers to the EEPROM memory and checks is error occurred.
• uint8_t tempprobe_read_temp( uint16_t sel_channel, float *data_out ) - Function reads temperature data from the desired channel.

Examples description

The application is composed of three sections :

• System Initialization - Initializes peripherals and pins.
• Application Initialization - Initializes SPI interface and performs a device configuration for properly working. Configures the desired channels and offers a choice to choose in which format temperature be measured. Temperature format can be celsius or fahrenheit.
• Application Task - Allows start of the conversion for the selected (masked) channels and when conversion cycle is done, reads temperature from channel 10, on which the thermocouple type K sensor is connected. The cold junction channel is channel 9, on which sensor measures the ambient temperature.

void application_task ( )
{
    uint8_t check_state;
    
    tempprobe_write_byte( TEMPPROBE_REG_COMM_STATUS, TEMPPROBE_START_CONV  );
    check_state = tempprobe_check_busy( );
    
    while ( check_state != TEMPPROBE_NO_BUSY_STATE )
    {
        check_state = tempprobe_check_busy( );
    }

    mikrobus_logWrite( ">> PN-Junction: ", _LOG_TEXT );
    tempprobe_read_temp( TEMPPROBE_REG_PN_JUNCTION_CONV_RES , &temperature_k );
    FloatToStr( temperature_k, demo_text );
    mikrobus_logWrite( demo_text, _LOG_LINE );

    mikrobus_logWrite(">> Thermo K: ", _LOG_TEXT );
    tempprobe_read_temp( TEMPPROBE_REG_THERMO_K_CONV_RES, &temperature_pn );
    FloatToStr( temperature_pn, demo_text );
    mikrobus_logWrite( demo_text, _LOG_LINE ); 

    Delay_ms( 1500 );
}

Other mikroE Libraries used in the example:

• Conversions
• SPI
• UART

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.