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  • This tutorial will show you how to connect many DS18B20, '1-Wire' temperature sensors to your Arduino board, using only 1 digital IO pin/one cable. Software code used in this tutorial can be downloaded here: Arduino ds18b20 Temperature Sensor Sketch OneWire Arduino Library. DallasTemperature Arduino Library Hardware used in this tutorial.
  • The Arduino Wire library documentation is notoriously stingy in details. Nowhere does it explain its relationship to the twi library of the avr-lib. Count's value is limited by BUFFER_LENGTH which is defined in the Wire.h include file; at the time of this writing that number is 32. If count is greater than 32 it will be set to 32 without.

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82adc95May 18, 2019

Arduino

8 contributors

Arduino Library Download

/*
TwoWire.h - TWI/I2C library for Arduino & Wiring
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
Modified December 2014 by Ivan Grokhotkov (ivan@esp8266.com) - esp8266 support
Modified April 2015 by Hrsto Gochkov (ficeto@ficeto.com) - alternative esp8266 support
*/
#ifndef TwoWire_h
#defineTwoWire_h
#include<inttypes.h>
#include'Stream.h'
#defineBUFFER_LENGTH128
classTwoWire : publicStream
{
private:
staticuint8_t rxBuffer[];
staticuint8_t rxBufferIndex;
staticuint8_t rxBufferLength;
staticuint8_t txAddress;
staticuint8_t txBuffer[];
staticuint8_t txBufferIndex;
staticuint8_t txBufferLength;
staticuint8_t transmitting;
staticvoid (*user_onRequest)(void);
staticvoid (*user_onReceive)(size_t);
staticvoidonRequestService(void);
staticvoidonReceiveService(uint8_t*, size_t);
public:
TwoWire();
voidbegin(int sda, int scl);
voidbegin(int sda, int scl, uint8_t address);
voidpins(int sda, int scl) __attribute__((deprecated)); // use begin(sda, scl) in new code
voidbegin();
voidbegin(uint8_t);
voidbegin(int);
voidsetClock(uint32_t);
voidsetClockStretchLimit(uint32_t);
voidbeginTransmission(uint8_t);
voidbeginTransmission(int);
uint8_tendTransmission(void);
uint8_tendTransmission(uint8_t);
size_trequestFrom(uint8_t address, size_t size, bool sendStop);
uint8_tstatus();
uint8_trequestFrom(uint8_t, uint8_t);
uint8_trequestFrom(uint8_t, uint8_t, uint8_t);
uint8_trequestFrom(int, int);
uint8_trequestFrom(int, int, int);
virtualsize_twrite(uint8_t);
virtualsize_twrite(constuint8_t *, size_t);
virtualintavailable(void);
virtualintread(void);
virtualintpeek(void);
virtualvoidflush(void);
voidonReceive( void (*)(int) ); // arduino api
voidonReceive( void (*)(size_t) ); // legacy esp8266 backward compatibility
voidonRequest( void (*)(void) );
using Print::write;
};
#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_TWOWIRE)
extern TwoWire Wire;
#endif
#endif

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