OK ds18b20 working fine, this is configuration
modbus.cfg
modbus:poll=1000
# NODE 1
#LEDs
modbus:serial.slave1.connection=/dev/ttyUSB0:19200:8:none:1:rtu
modbus:serial.slave1.type=coil
modbus:serial.slave1.id=1
modbus:serial.slave1.start=0
modbus:serial.slave1.length=2
#LightSensor && Temperature
modbus:serial.slave2.connection=/dev/ttyUSB0:19200:8:none:1:rtu
modbus:serial.slave2.type=holding
modbus:serial.slave2.id=1
modbus:serial.slave2.start=1
modbus:serial.slave2.length=2
#NODE 2
#LED
modbus:serial.slave3.connection=/dev/ttyUSB0:19200:8:none:1:rtu
modbus:serial.slave3.type=coil
modbus:serial.slave3.id=2
modbus:serial.slave3.start=0
modbus:serial.slave3.length=1
item:
Switch Slave1 { modbus="slave1:0" }
Switch Slave1r { modbus="slave1:1" }
Switch Slave2 { modbus="slave3:0" }
Number LightSensor "Light Sensor [%d LUX]" { modbus="slave2:0" }
Number Temperature "Temperature [%.1f °C]" { modbus="slave2:1" }
and all the thinks are saved in mysql database without installing JDBC olny MYSQL-persi…
and:
Instaling MYSQL:
sudo apt-get install mysql-server-5.5
and login
mysql -u root -p
and create new database:
create database openhab2;
and new user with all privilage to this db:
CREATE USER 'openhab'@'localhost' IDENTIFIED BY 'openhab';
GRANT ALL PRIVILEGES ON openhab2.* TO 'openhab'@'localhost';
quit;
and add new file to openhab2 dir:
sudo nano /opt/openhab/configurations/persistence/mysql.persist
with:
Strategies {
default = everyChange
}
Items {
* : strategy = default, restoreOnStartup
}
and mysql.cfg
chart:provider=default
persistence:default=mysql
org.eclipse.smarthome.persistence:default=mysql
mysql:url=jdbc:mysql://127.0.0.1:3306/openhab2
mysql:user=username
mysql:password=password
mysql:sqltype.string=VARCHAR(20000)
and thats all 
its working all changes are saved in db and value from all sensors in my case ligghtsensor and temperature and turon on and off for switches.
I forgot, i use DS18B20 9bit and its need 93ms (eg. 20,5 C) (for 12bit 750ms 20,5000C) to read or conversion data and on this time blocking node even is on multitasking, i use:
sensors.setWaitForConversion(false);
this is complite shetch for node 1:
#include <Timers.h>
#include <ModbusRtu.h>
#include <OneWire.h>
#include <DallasTemperature.h>
Timers <3> akcja;
// data array for modbus network sharing
//uint16_t au16data[16] = {
// 3, 1415, 9265, 4, 2, 7182, 28182, 8, 0, 0, 0, 0, 0, 0, 1, -1 };
uint16_t au16data[4];
/**
* Modbus object declaration
* u8id : node id = 0 for master, = 1..247 for slave
* u8serno : serial port (use 0 for Serial)
* u8txenpin : 0 for RS-232 and USB-FTDI
* or any pin number > 1 for RS-485
*/
//beg_lightsensor
#define photoPin A1 // Fotorezystor
volatile int lastLightLevel;
//end_lightsensor
//beg_temp
#define COMPARE_TEMP 1 // Wysyłaj temperaturę jeśli się zmieni? 1 = YES 0 = NO
#define MAX_ATTACHED_DS18B20 1
#define ONE_WIRE_BUS 7
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
DeviceAddress tempDeviceAddress;
int resolution = 9;
unsigned long lastTempRequest = 0;
int delayInMillis = 0;
volatile float lastTemperature[MAX_ATTACHED_DS18B20];
//end_temp
Modbus slave(1,0,2);
void setup() {
//Temp_beg
sensors.begin();
sensors.getAddress(tempDeviceAddress, 0);
sensors.setResolution(tempDeviceAddress, resolution);
sensors.setWaitForConversion(false);
delayInMillis = 750 / (1 << (12 - resolution));
lastTempRequest = millis();
//Temp_end
pinMode(11, OUTPUT);
pinMode(13, OUTPUT);
pinMode(photoPin, INPUT);
digitalWrite(11, LOW );
digitalWrite(13, LOW );
slave.begin( 19200 ); // baud-rate at 19200
au16data[0] = 0;
akcja.attach(0, 1, modbus); // Komunikacja modbus
akcja.attach(1, 300119, lightLevel); // Poziom natezenia swiatla co 5 min
akcja.attach(2, 309469, CheckTemp); // Odczyt temperatury co 5 min
}
void loop()
{
akcja.process();
}
void modbus()
{
if (slave.poll( au16data, 4 ))
{
digitalWrite( 11, bitRead( au16data[0], 0 ));
digitalWrite( 13, bitRead( au16data[0], 1 ));
au16data[1] = lastLightLevel;
au16data[2] = lastTemperature[0];
}
}
void lightLevel()
{
int lightLevel = (analogRead(photoPin));
if (lightLevel != lastLightLevel) {
lastLightLevel = lightLevel;
}
}
void CheckTemp()
{
if (millis() - lastTempRequest >= delayInMillis) // waited long enough??
{
sensors.requestTemperatures();
float temperature = sensors.getTempCByIndex(0);
int i=0;
#if COMPARE_TEMP == 1
if (lastTemperature[i] != temperature && temperature != -127.00 && temperature != 85.00) {
#else
if (temperature != -127.00 && temperature != 85.00) {
#endif
// Send in the new temperature
//temp = sensors.getTempCByIndex(i);
// Save new temperatures for next compare
lastTemperature[i]=temperature;
}
lastTempRequest = millis();
}
}
Next will be button to turn on and off on the led in node.
Somebady is reading this ??? :)))
