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Library

DS18X20 One Wire Library

Rating:

5

Author: Richard Lowe

Last Updated: 2013-09-19

Package Version: 1.0.0.3

Category: Measurement

Downloaded: 3360 times

Followed by: 1 user

License: MIT license  

Easily add DS18x20 sensor functions to your project.

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Library Blog

This is the first version.  This library assumes that it is the only sensor on the bus.  Sensor addressing is not yet supported.


Requirements: stdbool ( boolean definition file ) found on libstock


To use this library, you will need to edit the header file and define your port and pin.

Example:
//#define DS18X20_BASE_ADDRESS    &PORTA
//#define DS18X20_PIN             3
#define DS18X20_BASE_ADDRESS    &GPIOA_BASE
#define DS18X20_PIN             3

The example file included shows 2 different methods the library supports, polled and immediate.

Temp sensors are SLOW.  On a 8Mhz AVR with resolution set at 10 you will achieve 5-6 readings per second.  If the reading is not critical, then using the polled method works best.

There is also a formatted string function: ds18x20_get_str_temp( DS18X20_MODE_C ); that produces a formatted string based on MODE_C or MODE_F.
UPDATE:

Forgot about compiling into a library and macros....

This new version has a different initialization:

Example:

#include "ds18x20.h"

#define msg( txt ) UART1_Write_Text( txt )

void main() 
{
    ds18x20_config_t sensor;
    char txt_buffer[50];
    
    sensor.port = &PORTA;
    sensor.pin = 7;
    sensor.resolution = RES12;
    sensor.alarm_high = 0x22;
    sensor.alarm_low = 0x01;
    
    UART1_Init( 38400 );
    Delay_ms( 100 );
    
    ds18x20_init( &sensor );
    
    while(1)
    {
        sprintf( txt_buffer, "Temp is: %f\r\n", ds18x20_get_temp() );
        msg( txt_buffer );
        Delay_ms( 1000 );
    }

}

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