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temp_monitor_V2
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temp_monitor_V2
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/*
Temperature Monitor System with LM35 and NodeMCU uaing MQTT communication protocol
This sketch demonstrates the capabilities of the pubsub library in combination
with the ESP8266 board/library.
It connects to an MQTT server then:
- publishes "Temperature" to the topic "outTopic" every two seconds
- subscribes to the topic "inTopic", printing out any messages
it receives. NB - it assumes the received payloads are strings not binary
- If the first character of the topic "inTopic" is an 1, switch ON the ESP Led,
else switch it off
It will reconnect to the server if the connection is lost using a blocking
reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to
achieve the same result without blocking the main loop.
*/
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
// Update these with values suitable for your network.
const char* ssid = "AMMUANJU";
const char* password = "bolt123456";
const char* mqtt_server = "192.168.43.185";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
char temp1[50];
int value = 0;
float temp_celsius = 0;
float temp_fahrenheit = 0;
void setup() {
pinMode(A0, INPUT);
pinMode(BUILTIN_LED, OUTPUT); // Initialize the BUILTIN_LED pin as an output
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
// Switch on the LED if an 1 was received as first character
if ((char)payload[0] == '1') {
digitalWrite(BUILTIN_LED, LOW); // Turn the LED on (Note that LOW is the voltage level
// but actually the LED is on; this is because
// it is acive low on the ESP-01)
} else {
digitalWrite(BUILTIN_LED, HIGH); // Turn the LED off by making the voltage HIGH
}
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Attempt to connect
if (client.connect("ESP8266Client")) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("outTopic", "reconnect");
// ... and resubscribe
client.subscribe("inTopic");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
temp_celsius = ((analogRead(A0) * 330.0)/1024.0); /* To convert analog values to Celsius We have 3.3 V on our board and
we know that output voltage of LM35 varies by 10 mV to every degree Celsius rise/fall.*/
temp_fahrenheit = (temp_celsius * 1.8)+32.0;
Serial.print(" Temperature in Celsius = ");
Serial.println(String(temp_celsius).c_str());
Serial.print(" Temperature in Fahrenheit = ");
Serial.println(String(temp_fahrenheit).c_str());
long now = millis();
if (now - lastMsg > 2000) {
lastMsg = now;
++value;
snprintf (msg, 75, "Temperature #%ld", value);
Serial.print("Publish message: ");
Serial.println(msg);
client.publish("outTopic",msg);
client.publish("tempc",String(temp_celsius).c_str(),true);
client.publish("tempf",String(temp_fahrenheit).c_str(),true);
delay(5000);
}
}