Hi Guys, I've an issue with and esp8266, which I use to control a sauna light and heating, and send temperature and humidity via MQTT. I've used this same code and hardware elsewhere and it's rock stable, however in the instance I'm also using a LCD display over I2C. I find after an hour or so the the DHT22 sensor and the LCD stops working, but I can MQTT is still working.
Any ideas what could be going wrong??
Here is my code:
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include "DHT.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 20, 4);
// Uncomment one of the lines bellow for whatever DHT sensor type you're using!
//#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
// Change the credentials below, so your ESP8266 connects to your router
const char* ssid = "www.Sheepspeed.com";
const char* password = "effb101661";
String messageText;
// Change the variable to your Raspberry Pi IP address, so it connects to your MQTT broker
const char* mqtt_server = "192.168.100.84";
// Initializes the espClient
WiFiClient espClient;
PubSubClient client(espClient);
// Connect an LED to each GPIO of your ESP8266
const int heater = 10;
const int light = 16;
//char * = "text";
// DHT Sensor
const int DHTPin = 0;
int heateron;
// Initialize DHT sensor.
DHT dht(DHTPin, DHTTYPE);
// Timers auxiliar variables
long now = millis();
long lastMeasure = 0;
// Don't change the function below. This functions connects your ESP8266 to your router
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
lcd.setCursor(0, 0);
lcd.print("Connecting to ");
lcd.setCursor(0, 1);
lcd.print(ssid);
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("WiFi connected - ESP IP address: ");
lcd.setCursor(0, 2);
lcd.print("WiFi connected");
Serial.println(WiFi.localIP());
lcd.setCursor(0, 3);
lcd.print(WiFi.localIP());
}
void callback(String topic, byte* message, unsigned int length) {
Serial.print("Message arrived on topic: ");
Serial.print(topic);
Serial.print(". Message: ");
String messageTemp;
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
messageTemp += (char)message[i];
}
Serial.println();
// Feel free to add more if statements to control more GPIOs with MQTT
// If a message is received on the topic home/office/esp1/gpio2, you check if the message is either 1 or 0. Turns the ESP GPIO according to the message
if(topic=="sauna/heater"){
Serial.print("Changing GPIO 4 to ");
if(messageTemp == "1"){
digitalWrite(heater, HIGH);
//lcd.setCursor(0, 2);
// lcd.print("Sauna Heater is on!");
heateron=1;
Serial.print("On");
}
else if(messageTemp == "0"){
digitalWrite(heater, LOW);
// lcd.setCursor(0, 2);
// lcd.print("Sauna Heater is off");
heateron=0;
Serial.print("Off");
}
}
if(topic=="sauna/light"){
Serial.print("Changing GPIO 5 to ");
if(messageTemp == "1"){
digitalWrite(light, HIGH);
Serial.print("On");
}
else if(messageTemp == "0"){
digitalWrite(light, LOW);
Serial.print("Off");
}
}
if(topic=="sauna/message"){
if(messageTemp != NULL)
{
Serial.println ("not equal to NULL");
messageText=messageTemp;
}
}
Serial.println();
}
// This functions reconnects your ESP8266 to your MQTT broker
// Change the function below if you want to subscribe to more topics with your ESP8266
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
/*
YOU NEED TO CHANGE THIS NEXT LINE, IF YOU'RE HAVING PROBLEMS WITH MQTT MULTIPLE CONNECTIONS
To change the ESP device ID, you will have to give a unique name to the ESP8266.
Here's how it looks like now:
if (client.connect("sauna_node")) {
If you want more devices connected to the MQTT broker, you can do it like this:
if (client.connect("ESPOffice")) {
Then, for the other ESP:
if (client.connect("ESPGarage")) {
That should solve your MQTT multiple connections problem
THE SECTION IN loop() function should match your device name
*/
if (client.connect("sauna_node")) {
Serial.println("connected");
// Subscribe or resubscribe to a topic
// You can subscribe to more topics (to control more LEDs in this example)
client.subscribe("sauna/heater");
client.subscribe("sauna/light");
client.subscribe("sauna/message");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
// The setup function sets your ESP GPIOs to Outputs, starts the serial communication at a baud rate of 115200
// Sets your mqtt broker and sets the callback function
// The callback function is what receives messages and actually controls the LEDs
void setup() {
dht.begin();
pinMode(light, OUTPUT);
pinMode(heater, OUTPUT);
heateron=0;
digitalWrite(heater, LOW);
digitalWrite(light, LOW);
lcd.begin();
lcd.backlight();
lcd.clear();
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
// For this project, you don't need to change anything in the loop function.
// Basically it ensures that you ESP is connected to your broker
void loop() {
int motion;
if (!client.connected()) {
reconnect();
}
if(!client.loop())
/*
YOU NEED TO CHANGE THIS NEXT LINE, IF YOU'RE HAVING PROBLEMS WITH MQTT MULTIPLE CONNECTIONS
To change the ESP device ID, you will have to give a unique name to the ESP8266.
Here's how it looks like now:
client.connect("sauna_node");
If you want more devices connected to the MQTT broker, you can do it like this:
client.connect("ESPOffice");
Then, for the other ESP:
client.connect("ESPGarage");
That should solve your MQTT multiple connections problem
THE SECTION IN recionnect() function should match your device name
*/
client.connect("sauna_node");
now = millis();
// Publishes new temperature and humidity every 10 seconds
if (now - lastMeasure > 10000) {
lastMeasure = now;
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
// Computes temperature values in Celsius
float hic = dht.computeHeatIndex(t, h, false);
static char temperatureTemp[7];
dtostrf(hic, 6, 2, temperatureTemp);
static char humidityTemp[7];
dtostrf(h, 6, 2, humidityTemp);
// Publishes Temperature and Humidity values
client.publish("/sauna/temperature", temperatureTemp);
client.publish("/sauna/humidity", humidityTemp);
lcd.clear();
Serial.print("Humidity: ");
lcd.setCursor(0, 0);
lcd.print("Humidity: ");
Serial.print(h);
lcd.print(h);
lcd.print("%");
lcd.setCursor(0, 1);
lcd.print("Temperature: ");
Serial.print(" %\t Temperature: ");
Serial.print(t);
lcd.print(hic);
Serial.print(" *C ");
lcd.print(" C");
Serial.print(f);
Serial.print(" *F\t Heat index: ");
Serial.print(hic);
Serial.println(" *C ");
lcd.setCursor(0, 3);
lcd.print(messageText);
if (heateron==0)
{
lcd.setCursor(0, 2);
lcd.print("Sauna Heater is off");
}
if (heateron ==1)
{
lcd.setCursor(0, 2);
lcd.print("Sauna Heater is on!");
}
motion = digitalRead(2);
if (motion == 1)
{
client.publish("sauna/motion", "1"); // means on
}
else
{
client.publish("sauna/motion", "0"); // means off
}
//maybe add } back here
}
}