Hi guys.
Here is the code for the pool temperature sensor project. You’ll find the video in the sidebar or on YouTube.
#include <Arduino.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>
const char* SSID = "your_ssid";
const char* PSK = "your_password";
const char* hostname = "PoolTempSensor";
const char* MQTT_BROKER = "mqtt_broker_ip";
WiFiClient espClient;
PubSubClient client(espClient);
char msg[50];
unsigned long lastMsg = 0;
#define ONE_WIRE_BUS 4
#define Anzahl_Sensoren_DS18B20 1 // Define how many sensors you want to use
#define DS18B20_Aufloesung 12
DeviceAddress DS18B20_Adressen;
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature myDS18B20(&oneWire);
const float No_Val = 999.99;
float Temperatur[Anzahl_Sensoren_DS18B20];
//setup wifi and wait for connection
void setup_wifi() {
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(SSID);
WiFi.mode(WIFI_STA);
WiFi.hostname(hostname);
WiFi.begin(SSID, PSK);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void setup() {
Serial.begin(9600);
Serial.println("DS18B20 Test");
Serial.println();
setup_wifi();
delay(100);
Serial.print("Anzahl aktivierter Sensoren: ");
Serial.println(Anzahl_Sensoren_DS18B20);
if ((Anzahl_Sensoren_DS18B20 > 0)) {
myDS18B20.begin();
Serial.print("Anzahl angeschlossener Sensoren: ");
Serial.println(myDS18B20.getDeviceCount(), DEC);
Serial.println();
for(byte i=0 ;i < myDS18B20.getDeviceCount(); i++) {
if(myDS18B20.getAddress(DS18B20_Adressen, i)) {
myDS18B20.setResolution(DS18B20_Adressen, DS18B20_Aufloesung);
}
}
}
client.setServer(MQTT_BROKER, 1883);
}
//reconnect wifi if disconnected
void reconnect() {
while (!client.connected()) {
Serial.print("Reconnecting...");
if (!client.connect("ESP8266Client")) {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" retrying in 5 seconds");
delay(5000);
}
}
//client.subscribe("/basement/office/toplight");
Serial.println("MQTT Connected...");
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
if ((Anzahl_Sensoren_DS18B20 > 0)) {
myDS18B20.requestTemperatures();
for(byte i=0 ;i < Anzahl_Sensoren_DS18B20; i++) {
if (i < myDS18B20.getDeviceCount()) {
Serial.print("Sensor ");
Serial.print(i+1);
Serial.print(": ");
Temperatur[i] = myDS18B20.getTempCByIndex(i);
if (Temperatur[i] == DEVICE_DISCONNECTED_C) {
Temperatur[i] = No_Val;
Serial.println("Fehler");
}
else {
Serial.print(Temperatur[i]);
Serial.println(" 'C");
char msg[8]; // Buffer big enough for 7-character float
dtostrf(Temperatur[i], 6, 2, msg);
client.publish("your/topic", msg);
Serial.println("");
Serial.print(msg);
Serial.println(" an MQTT Broker gesendet!");
}
}
}
}
Serial.println();
Serial.println("Going into deep sleep now...");
delay(5000);
ESP.deepSleep(1800*1000000);
}