WT040
Published © GPL3+

Multi Temperature Sensor

An Arduino based device to read multiple DS18B20 sensors and send the values through a RS232 connection to a domotica system.

EasyFull instructions provided4 hours5,230
Multi Temperature Sensor

Things used in this project

Hardware components

DS18B20
×8
screws
×1
Arduino Nano R3
Arduino Nano R3
×1
experiment pcb
×1
resistor 4.7k
×1
2 port screwterminal
×1
SparkFun RS232 Shifter - SMD
SparkFun RS232 Shifter - SMD
×1
3D printed case
×1
wire
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)
screwdriver

Story

Read more

Custom parts and enclosures

Case bottom

3D printable case - bottom

Case top

3D printable case - top

Case sub-d 9 mount

3D printable case - sub-d 9 mount

Schematics

basic schematic, without rs232 module

basic schematic, without rs232 module

Code

MultiTempSensor v1.0.0

Arduino
Arduino Code
/*
MultiTempSensor code by WT040
The sensor code is based on the examples from Rik Kretzinger and some other snippets of code

History:
v0.1.1  27/11/2016
v0.1.5  04/12/2016 pre-release version
v1.0.0	04/12/2017 release version
*/

//Include's
#include <OneWire.h>
#include <DallasTemperature.h>

//Constants
#define SENSOR_PIN 12
#define READ_TIMER 10000  //10 seconds
//

OneWire oneWire(SENSOR_PIN);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

//Sensor Adresses 
DeviceAddress Sensor1 = { 0x28, 0xFF, 0x89, 0x0F, 0x61, 0x16, 0x03, 0x40 };
DeviceAddress Sensor2 = { 0x28, 0xFF, 0xE2, 0x0F, 0x61, 0x16, 0x03, 0x21 };
DeviceAddress Sensor3 = { 0x28, 0xFF, 0x38, 0xB3, 0x60, 0x16, 0x03, 0xEA };
DeviceAddress Sensor4 = { 0x28, 0xFF, 0xA4, 0xBE, 0x60, 0x16, 0x03, 0xE1 };
DeviceAddress Sensor5 = { 0x28, 0xFF, 0xFE, 0x13, 0x61, 0x16, 0x03, 0x56 };
DeviceAddress Sensor6 = { 0x28, 0xFF, 0x89, 0xBA, 0x60, 0x16, 0x03, 0xFB };
DeviceAddress Sensor7 = { 0x28, 0xFF, 0xFA, 0xBC, 0x60, 0x16, 0x03, 0xD1 };
DeviceAddress Sensor8 = { 0x28, 0xFF, 0x57, 0xB1, 0x60, 0x16, 0x03, 0x93 };

int amountOfSensors = 8;


//variable to check amount of sensors on bus once in a while
int counterCheckBus = 0;

void setup()
{
	// start serial port to show results
	Serial.begin(9600);
	//display_Running_Sketch();
	printProgramName();
	Serial.print("Initializing Temperature Control Library Version ");
	Serial.println(DALLASTEMPLIBVERSION);

	Serial.print("Searching for ");
	Serial.print(amountOfSensors);
	Serial.println(" sensors...");

	// Initialize the Temperature measurement library
	sensors.begin();

	// set the resolution to 10 bit (Can be 9 to 12 bits .. lower is faster)
	sensors.setResolution(Sensor1, 10);
	sensors.setResolution(Sensor2, 10);
	sensors.setResolution(Sensor3, 10);
	sensors.setResolution(Sensor4, 10);
	sensors.setResolution(Sensor5, 10);
	sensors.setResolution(Sensor6, 10);
	sensors.setResolution(Sensor7, 10);
	sensors.setResolution(Sensor8, 10);

	getSensorsOnBus();
	Serial.println("System initialized");
}

void loop()
{
	counterCheckBus++;
	delay(READ_TIMER);
	Serial.println();

	if (counterCheckBus == 360)
	{
		getSensorsOnBus();
		counterCheckBus = 0;
	}


	sensors.requestTemperatures();

	Serial.print("Sensor 1:   ");
	printTemperature(Sensor1);
	Serial.println();

	Serial.print("Sensor 2:   ");
	printTemperature(Sensor2);
	Serial.println();

	Serial.print("Sensor 3:   ");
	printTemperature(Sensor3);
	Serial.println();

	Serial.print("Sensor 4:   ");
	printTemperature(Sensor4);
	Serial.println();

	Serial.print("Sensor 5:   ");
	printTemperature(Sensor5);
	Serial.println();

	Serial.print("Sensor 6:   ");
	printTemperature(Sensor6);
	Serial.println();

	Serial.print("Sensor 7:   ");
	printTemperature(Sensor7);
	Serial.println();

	Serial.print("Sensor 8:   ");
	printTemperature(Sensor8);
	Serial.println();


}

void printTemperature(DeviceAddress deviceAddress)
{

	float tempC = sensors.getTempC(deviceAddress);

	if (tempC == -127.00)
	{
		Serial.print("Sensor error!");
	}
	else
	{
		Serial.print("C: ");
		Serial.print(tempC);
	}
}

void printProgramName() {
	String path = __FILE__;
	int slash = path.lastIndexOf('\\');
	String programName = path.substring(slash + 1);
	int dot = programName.lastIndexOf('.');
	programName = programName.substring(0, dot);

	Serial.print("\nProgram version: ");
	Serial.println(programName);
}

void getSensorsOnBus() {
	Serial.print("Number of sensors found on bus: ");
	Serial.println(sensors.getDeviceCount());
}

Credits

WT040

WT040

2 projects • 9 followers

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