Arduino : Prototype de sonde de température, Oregon 2.1 compatible, à consommation réduite

/*
* connectingStuff, Oregon Scientific v2.1 Emitter
* http://connectingstuff.net/blog/encodage-protocoles-oregon-scientific-sur-arduino/
*
* Copyright (C) 2013 olivier.lebrun@gmail.com
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* Programmme modifié le 3 février 2017 par Claude Glowacki
*
*/
#include « LowPower.h »
#include
#define DS18B20 0x28 // Adresse 1-Wire du DS18B20
#define BROCHE_ONEWIRE 10 // Broche utilisée pour le bus 1-Wire

OneWire ds(BROCHE_ONEWIRE); // Création de l’objet OneWire ds

#define THN132N

const byte TX_PIN = 3;

const unsigned long TIME = 512;
const unsigned long TWOTIME = TIME*2;

#define SEND_HIGH() digitalWrite(TX_PIN, HIGH)
#define SEND_LOW() digitalWrite(TX_PIN, LOW)

// Buffer for Oregon message
#ifdef THN132N
byte OregonMessageBuffer[8];
#else
byte OregonMessageBuffer[9];
#endif

/**
* \brief Send logical « 0 » over RF
* \details azero bit be represented by an off-to-on transition
* \ of the RF signal at the middle of a clock period.
* \ Remenber, the Oregon v2.1 protocol add an inverted bit first
*/
inline void sendZero(void)
{
SEND_HIGH();
delayMicroseconds(TIME);
SEND_LOW();
delayMicroseconds(TWOTIME);
SEND_HIGH();
delayMicroseconds(TIME);
}

/**
* \brief Send logical « 1 » over RF
* \details a one bit be represented by an on-to-off transition
* \ of the RF signal at the middle of a clock period.
* \ Remenber, the Oregon v2.1 protocol add an inverted bit first
*/
inline void sendOne(void)
{
SEND_LOW();
delayMicroseconds(TIME);
SEND_HIGH();
delayMicroseconds(TWOTIME);
SEND_LOW();
delayMicroseconds(TIME);
}

/**
* Send a bits quarter (4 bits = MSB from 8 bits value) over RF
*
* @param data Source data to process and sent
*/

/**
* \brief Send a bits quarter (4 bits = MSB from 8 bits value) over RF
* \param data Data to send
*/
inline void sendQuarterMSB(const byte data)
{
(bitRead(data, 4)) ? sendOne() : sendZero();
(bitRead(data, 5)) ? sendOne() : sendZero();
(bitRead(data, 6)) ? sendOne() : sendZero();
(bitRead(data, 7)) ? sendOne() : sendZero();
}

/**
* \brief Send a bits quarter (4 bits = LSB from 8 bits value) over RF
* \param data Data to send
*/
inline void sendQuarterLSB(const byte data)
{
(bitRead(data, 0)) ? sendOne() : sendZero();
(bitRead(data, 1)) ? sendOne() : sendZero();
(bitRead(data, 2)) ? sendOne() : sendZero();
(bitRead(data, 3)) ? sendOne() : sendZero();
}

/******************************************************************/
/******************************************************************/
/******************************************************************/

/**
* \brief Send a buffer over RF
* \param data Data to send
* \param size size of data to send
*/
void sendData(byte *data, byte size)
{
for(byte i = 0; i < size; ++i)
{
sendQuarterLSB(data[i]);
sendQuarterMSB(data[i]);
}
}

/**
* \brief Send an Oregon message
* \param data The Oregon message
*/
void sendOregon(byte *data, byte size)
{
sendPreamble();
//sendSync();
sendData(data, size);
sendPostamble();
}

/**
* \brief Send preamble
* \details The preamble consists of 16 "1" bits
*/
inline void sendPreamble(void)
{
byte PREAMBLE[]={0xFF,0xFF};
sendData(PREAMBLE, 2);
}

/**
* \brief Send postamble
* \details The postamble consists of 8 "0" bits
*/
inline void sendPostamble(void)
{
#ifdef THN132N
sendQuarterLSB(0x00);
#else
byte POSTAMBLE[]={0x00};
sendData(POSTAMBLE, 1);
#endif
}

/**
* \brief Send sync nibble
* \details The sync is 0xA. It is not use in this version since the sync nibble
* \ is include in the Oregon message to send.
*/
inline void sendSync(void)
{
sendQuarterLSB(0xA);
}

/******************************************************************/
/******************************************************************/
/******************************************************************/

/**
* \brief Set the sensor type
* \param data Oregon message
* \param type Sensor type
*/
inline void setType(byte *data, byte* type)
{
data[0] = type[0];
data[1] = type[1];
}

/**
* \brief Set the sensor channel
* \param data Oregon message
* \param channel Sensor channel (0x10, 0x20, 0x30)
*/
inline void setChannel(byte *data, byte channel)
{
data[2] = channel;
}

/**
* \brief Set the sensor ID
* \param data Oregon message
* \param ID Sensor unique ID
*/
inline void setId(byte *data, byte ID)
{
data[3] = ID;
}

/**
* \brief Set the sensor battery level
* \param data Oregon message
* \param level Battery level (0 = low, 1 = high)
*/
void setBatteryLevel(byte *data, byte level)
{
if(!level) data[4] = 0x0C;
else data[4] = 0x00;
}

/**
* \brief Set the sensor temperature
* \param data Oregon message
* \param temp the temperature
*/
void setTemperature(byte *data, float temp)
{
// Set temperature sign
if(temp < 0)
{
data[6] = 0x08;
temp *= -1;
}
else
{
data[6] = 0x00;
}

// Determine decimal and float part
int tempInt = (int)temp;
int td = (int)(tempInt / 10);
int tf = (int)round((float)((float)tempInt/10 – (float)td) * 10);

int tempFloat = (int)round((float)(temp – (float)tempInt) * 10);

// Set temperature decimal part
data[5] = (td << 4);
data[5] |= tf;

// Set temperature float part
data[4] |= (tempFloat << 4);
}

/**
* \brief Set the sensor humidity
* \param data Oregon message
* \param hum the humidity
*/
void setHumidity(byte* data, byte hum)
{
data[7] = (hum/10);
data[6] |= (hum – data[7]*10) << 4;
}

/**
* \brief Sum data for checksum
* \param count number of bit to sum
* \param data Oregon message
*/
int Sum(byte count, const byte* data)
{
int s = 0;

for(byte i = 0; i> 4;
s += (data[i]&0xF);
}

if(int(count) != count)
s += (data[count]&0xF0) >> 4;

return s;
}

/**
* \brief Calculate checksum
* \param data Oregon message
*/
void calculateAndSetChecksum(byte* data)
{
#ifdef THN132N
int s = ((Sum(6, data) + (data[6]&0xF) – 0xa) & 0xff);

data[6] |= (s&0x0F) <> 4;
#else
data[8] = ((Sum(8, data) – 0xa) & 0xFF);
#endif
}

/******************************************************************/
/******************************************************************/

// Fonction récupérant la température depuis le DS18B20
// Retourne true si tout va bien, ou false en cas d’erreur
boolean getTemperature(float *temp){
byte data[9], addr[8];
// data : Données lues depuis le scratchpad
// addr : adresse du module 1-Wire détecté

if (!ds.search(addr)) { // Recherche un module 1-Wire
ds.reset_search(); // Réinitialise la recherche de module
return false; // Retourne une erreur
}

if (OneWire::crc8(addr, 7) != addr[7]) // Vérifie que l’adresse a été correctement reçue
return false; // Si le message est corrompu on retourne une erreur

if (addr[0] != DS18B20) // Vérifie qu’il s’agit bien d’un DS18B20
return false; // Si ce n’est pas le cas on retourne une erreur

ds.reset(); // On reset le bus 1-Wire
ds.select(addr); // On sélectionne le DS18B20

ds.write(0x44, 1); // On lance une prise de mesure de température
delay(1000); // Et on attend la fin de la mesure

ds.reset(); // On reset le bus 1-Wire
ds.select(addr); // On sélectionne le DS18B20
ds.write(0xBE); // On envoie une demande de lecture du scratchpad

for (byte i = 0; i < 9; i++) // On lit le scratchpad
data[i] = ds.read(); // Et on stock les octets reçus

// Calcul de la température en degré Celsius
*temp = ((data[1] << 8) | data[0]) * 0.0625;

// Pas d'erreur
return true;
}

/******************************************************************/
void setup()
{
pinMode(8, OUTPUT); // Reset CD4060 port = 8
digitalWrite(8, LOW); //

pinMode(13, OUTPUT);
digitalWrite(13,LOW);

pinMode(TX_PIN, OUTPUT);

SEND_LOW();

#ifdef THN132N
// Create the Oregon message for a temperature only sensor (TNHN132N)
byte ID[] = {0xEA,0x4C};
#else
// Create the Oregon message for a temperature/humidity sensor (THGR2228N)
byte ID[] = {0x1A,0x2D};
#endif

setType(OregonMessageBuffer, ID);
setChannel(OregonMessageBuffer, 0x20);
setId(OregonMessageBuffer, 0xBD);
oneTime();
digitalWrite(8, HIGH); // turn the LED off by making the voltage LOW

}

void oneTime()
{
// Get Temperature, humidity and battery level from sensors
float temp;
if (getTemperature(&temp)) {
// (ie: 1wire DS18B20 for température, …)
setBatteryLevel(OregonMessageBuffer, 1); // 0 : low, 1 : high
setTemperature(OregonMessageBuffer, temp);

#ifndef THN132N
// Set Humidity
setHumidity(OregonMessageBuffer, 52);
#endif

// Calculate the checksum
calculateAndSetChecksum(OregonMessageBuffer);
// Send the Message over RF
sendOregon(OregonMessageBuffer, sizeof(OregonMessageBuffer));
// Send a "pause"
SEND_LOW();
delayMicroseconds(TWOTIME*8);
// Send a copie of the first message. The v2.1 protocol send the
// message two time
sendOregon(OregonMessageBuffer, sizeof(OregonMessageBuffer));
}
digitalWrite(8, HIGH); // turn the LED off by making the voltage LOW
}
void loop(){
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
}