Now supports DS18B20 and DS18S20 Maxim/Dallas one-wire thermometer devices. Also supports DS18S20 in 9, 10, 11, and 12 bit resolution modes. 'Use Address' mode now checks if the correct device type is present, and informs the user which device to use. Correct temperature conversion times now used in non-parasitic mode. The device should be placed at least 6 inches (15 cm) from the mbed board in order to accurately read ambient temperature.
OneWireThermometer.h
00001 /* 00002 * OneWireThermometer. Base class for Maxim One-Wire Thermometers. 00003 * Uses the OneWireCRC library. 00004 * 00005 * Copyright (C) <2010> Petras Saduikis <petras@petras.co.uk> 00006 * 00007 * This file is part of OneWireThermometer. 00008 * 00009 * OneWireThermometer is free software: you can redistribute it and/or modify 00010 * it under the terms of the GNU General Public License as published by 00011 * the Free Software Foundation, either version 3 of the License, or 00012 * (at your option) any later version. 00013 * 00014 * OneWireThermometer is distributed in the hope that it will be useful, 00015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00017 * GNU General Public License for more details. 00018 * 00019 * You should have received a copy of the GNU General Public License 00020 * along with OneWireThermometer. If not, see <http://www.gnu.org/licenses/>. 00021 */ 00022 00023 #ifndef SNATCH59_ONEWIRETHERMOMETER_H 00024 #define SNATCH59_ONEWIRETHERMOMETER_H 00025 00026 #include <mbed.h> 00027 #include "OneWireCRC.h" 00028 #include "OneWireDefs.h" 00029 00030 typedef unsigned char BYTE; // something a byte wide 00031 00032 class OneWireThermometer 00033 { 00034 public: 00035 OneWireThermometer(bool crcOn, bool useAddr, bool parasitic, PinName pin, int device_id); 00036 00037 bool initialize(); 00038 float readTemperature(); 00039 virtual void setResolution(eResolution resln) = 0; 00040 00041 protected: 00042 const bool useParasiticPower; 00043 const bool useCRC; 00044 const bool useAddress; 00045 const int deviceId; 00046 00047 eResolution resolution; 00048 BYTE address[8]; 00049 00050 OneWireCRC oneWire; 00051 00052 void resetAndAddress(); 00053 bool readAndValidateData(BYTE* data); 00054 virtual float calculateTemperature(BYTE* data) = 0; // device specific 00055 }; 00056 00057 #endif
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