/*********
Rui Santos
Complete project details at https://RandomNerdTutorials.com/esp32-esp8266-thermostat-web-server/
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files.
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
*********/
//#ifdef ESP32
#include <WiFi.h>
#include <AsyncTCP.h>
//#else
// #include <ESP8266WiFi.h>
// #include <ESPAsyncTCP.h>
//#endif
#include <ESPAsyncWebServer.h>
#include <Wire.h>
#include <OneWire.h>
#include <DallasTemperature.h>
// REPLACE WITH YOUR NETWORK CREDENTIALS
//const char* ssid = "REPLACE_WITH_YOUR_SSID";
//const char* password = "REPLACE_WITH_YOUR_PASSWORD";
const char* ssid = "PTS-2F";
const char* password = "PTS6662594";
// Default Threshold Temperature Value
String inputMessage = "25.0";
String lastTemperature;
String enableArmChecked = "checked";
String inputMessage2 = "true";
// HTML web page to handle 2 input fields (threshold_input, enable_arm_input)
const char index_html[] PROGMEM = R"rawliteral(
<!DOCTYPE HTML><html><head>
<title>Temperature Threshold Output Control</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head><body>
<h2>DS18B20 Temperature</h2>
<h3>%TEMPERATURE% °C</h3>
<h2>ESP Arm Trigger</h2>
<form action="/get">
Temperature Threshold <input type="number" step="0.1" name="threshold_input" value="%THRESHOLD%" required><br>
Arm Trigger <input type="checkbox" name="enable_arm_input" value="true" %ENABLE_ARM_INPUT%><br><br>
<input type="submit" value="Submit">
</form>
</body></html>)rawliteral";
void notFound(AsyncWebServerRequest *request) {
request->send(404, "text/plain", "Not found");
}
AsyncWebServer server(80);
// Replaces placeholder with DS18B20 values
String processor(const String& var){
//Serial.println(var);
if(var == "TEMPERATURE"){
return lastTemperature;
}
else if(var == "THRESHOLD"){
return inputMessage;
}
else if(var == "ENABLE_ARM_INPUT"){
return enableArmChecked;
}
return String();
}
// Flag variable to keep track if triggers was activated or not
bool triggerActive = false;
const char* PARAM_INPUT_1 = "threshold_input";
const char* PARAM_INPUT_2 = "enable_arm_input";
// Interval between sensor readings. Learn more about ESP32 timers: https://RandomNerdTutorials.com/esp32-pir-motion-sensor-interrupts-timers/
unsigned long previousMillis = 0;
const long interval = 5000;
// GPIO where the output is connected to
const int output = 2;
// GPIO where the DS18B20 is connected to
const int oneWireBus = 4;
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(oneWireBus);
// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);
void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
if (WiFi.waitForConnectResult() != WL_CONNECTED) {
Serial.println("WiFi Failed!");
return;
}
Serial.println();
Serial.print("ESP IP Address: http://");
Serial.println(WiFi.localIP());
pinMode(output, OUTPUT);
digitalWrite(output, LOW);
// Start the DS18B20 sensor
sensors.begin();
// Send web page to client
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/html", index_html, processor);
});
// Receive an HTTP GET request at <ESP_IP>/get?threshold_input=<inputMessage>&enable_arm_input=<inputMessage2>
server.on("/get", HTTP_GET, [] (AsyncWebServerRequest *request) {
// GET threshold_input value on <ESP_IP>/get?threshold_input=<inputMessage>
if (request->hasParam(PARAM_INPUT_1)) {
inputMessage = request->getParam(PARAM_INPUT_1)->value();
// GET enable_arm_input value on <ESP_IP>/get?enable_arm_input=<inputMessage2>
if (request->hasParam(PARAM_INPUT_2)) {
inputMessage2 = request->getParam(PARAM_INPUT_2)->value();
enableArmChecked = "checked";
}
else {
inputMessage2 = "false";
enableArmChecked = "";
}
}
Serial.println(inputMessage);
Serial.println(inputMessage2);
request->send(200, "text/html", "HTTP GET request sent to your ESP.<br><a href=\"/\">Return to Home Page</a>");
});
server.onNotFound(notFound);
server.begin();
}
void loop() {
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
sensors.requestTemperatures();
// Temperature in Celsius degrees
float temperature = sensors.getTempCByIndex(0);
Serial.print(temperature);
Serial.println(" *C");
// Temperature in Fahrenheit degrees
/*float temperature = sensors.getTempFByIndex(0);
Serial.print(temperature);
Serial.println(" *F");*/
lastTemperature = String(temperature);
// Check if temperature is above threshold and if it needs to trigger output
if(temperature > inputMessage.toFloat() && inputMessage2 == "true" && !triggerActive){
String message = String("Temperature above threshold. Current temperature: ") +
String(temperature) + String("C");
Serial.println(message);
triggerActive = true;
digitalWrite(output, HIGH);
}
// Check if temperature is below threshold and if it needs to trigger output
else if((temperature < inputMessage.toFloat()) && inputMessage2 == "true" && triggerActive) {
String message = String("Temperature below threshold. Current temperature: ") +
String(temperature) + String(" C");
Serial.println(message);
triggerActive = false;
digitalWrite(output, LOW);
}
}
}
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