Arduino DS1620 Library

The Arduino DS1620 Library provides an easy way to interface an Arduino with the Dallas Semiconductor DS1620 Digital Thermometer and Thermostat. The DS1620 can provide 9–bit temperatures and has three thermal alarm outputs, allowing it to act as a thermometer and thermostat.

read_temp()

write_th(int)

write_tl(int)

read_th()

read_tl()

start_conv()

stop_conv()

write_config(int)

read_config()

read_counter()

read_slope()

Datasheet: DS1620.pdf

Arduino DS1620 Library is now hosted at Github: Clone it, fork it, love it!

/*
    Arduino DS1620 Library - Example Sketch
    Copyright (C) 2009 John P. Mulligan
    
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
    Documentation and latest version: http://wiki.thinkhole.org/ds1620

    Basic Pin Setup
    
    ARDUINO       DS1620
    -------       --------------
    +5 V          Pin 8 VDD
    GND           Pin 4 GND
    Pin 5         Pin 1 DQ
    Pin 4         Pin 2 CLK/CONV
    Pin 3         Pin 3 RST
    
     -------------
    | Arduino  13 |
    |          12 |
    |          11 |
    |          10 |
    |           9 |
    |           8 |
    |           7 |               ------------------
    |           6 |              |      DS1620      |
    |           5 |--------------| DQ           VDD |------ +5 V
    |           4 |--------------| CLK/CONV  T HIGH |
    |           3 |--------------| RST        T LOW |
    |           2 |     GROUND---| GND        T COM |
    |           1 |               ------------------
     -------------

    *  No external parts are required for basic temperature reading
    
*/

#include "DS1620.h"

// Define pins for 3-wire serial communication
int dq = 5;
int clk = 4;
int rst = 3;

// Call DS1620 constructor using pin variables
DS1620 d = DS1620(dq, clk, rst);

void setup()
{  
  // Start serial communications, 9600 baud
  Serial.begin(9600);

  // Write TH and TL setpoints to DS1620 EEPROM  
  // Settings are retained even with no power
  d.write_th(30);
  d.write_tl(15);
  
  // Write config to DS1620 configuration/status register
  // Decimal 10 = Binary 00001010
  // Enables CPU-Mode and disables 1-Shot Mode.
  // See Datasheet for details
  d.write_config(10);
  
  // Start continuous temperature conversion
  // Readings can be read about once per second this way
  d.start_conv();

  // Print TH and TL to serial monitor
  Serial.print("TH = "); Serial.println(d.read_th());
  Serial.print("TL = "); Serial.println(d.read_tl());
}

void loop()
{
  //  Read and print temperature (degrees C) to serial monitor
  Serial.println(d.read_temp());
  
  // Wait 1 second (1000 ms) before reading next temperature
  delay(1000);
}

Paul Ring (ringp): Negative temperature bug fix, 12-18-2010