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/*********
Rui Santos
Complete project details at https://randomnerdtutorials.com
*********/
// Load libraries
#include <ESP8266WiFi.h>
#include <EEPROM.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";
// Auxiliary variables for temperature
static char celsiusTemp[7];
static char fahrenheitTemp[7];
String temperatureString = ""; // Variable to hold the temperature reading
// EEPROM size
// Address 0: Last output state (0 = off or 1 = on)
// Address 1: Selected mode (0 = Manual, 1 = Auto PIR,
// 2 = Auto LDR, or 3 = Auto PIR and LDR)
// Address 2: Timer (time 0 to 255 seconds)
// Address 3: LDR threshold value (luminosity in percentage 0 to 100%)
#define EEPROM_SIZE 4
// Set GPIOs for: output variable, status LED, PIR Motion Sensor, and LDR
const int output = 15;
const int statusLed = 12;
const int motionSensor = 5;
const int ldr = A0;
// Store the current output state
String outputState = "off";
// 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);
// Timers - Auxiliary variables
unsigned long now = millis();
unsigned long lastMeasure = 0;
boolean startTimer = false;
unsigned long currentTime = millis();
unsigned long previousTime = 0;
const long timeoutTime = 2000;
// Auxiliary variables to store selected mode and settings
int selectedMode = 0;
int timer = 0;
int ldrThreshold = 0;
int armMotion = 0;
int armLdr = 0;
String modes[4] = { "Manual", "Auto PIR", "Auto LDR", "Auto PIR and LDR" };
// Decode HTTP GET value
String valueString = "0";
int pos1 = 0;
int pos2 = 0;
// Variable to store the HTTP request
String header;
// Set web server port number to 80
WiFiServer server(80);
void setup() {
// Start the DS18B20 sensor
sensors.begin();
// Serial port for debugging purposes
Serial.begin(115200);
// PIR Motion Sensor mode, then set interrupt function and RISING mode
pinMode(motionSensor, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(motionSensor), detectsMovement, RISING);
Serial.println("start...");
EEPROM.begin(EEPROM_SIZE);
// Uncomment the next lines to test the values stored in the flash memory
/*Serial.println(" bytes read from Flash . Values are:");
for(int i = 0; i < EEPROM_SIZE; i++) {
Serial.print(byte(EEPROM.read(i)));
Serial.print(" ");
}*/
// Initialize the output variable and the LED as OUTPUTs
pinMode(output, OUTPUT);
pinMode(statusLed, OUTPUT);
digitalWrite(output, HIGH);
digitalWrite(statusLed, LOW);
// Read from flash memory on start and store the values in auxiliary variables
// Set output to last state (saved in the flash memory)
if(!EEPROM.read(0)) {
outputState = "off";
digitalWrite(output, HIGH);
}
else {
outputState = "on";
digitalWrite(output, LOW);
}
selectedMode = EEPROM.read(1);
timer = EEPROM.read(2);
ldrThreshold = EEPROM.read(3);
configureMode();
// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// Print local IP address and start web server
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
void loop() {
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
currentTime = millis();
previousTime = currentTime;
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected
currentTime = millis();
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #555555;}</style></head>");
// Request example: GET /?mode=0& HTTP/1.1 - sets mode to Manual (0)
if(header.indexOf("GET /?mode=") >= 0) {
pos1 = header.indexOf('=');
pos2 = header.indexOf('&');
valueString = header.substring(pos1+1, pos2);
selectedMode = valueString.toInt();
EEPROM.write(1, selectedMode);
EEPROM.commit();
configureMode();
}
// Change the output state - turn GPIOs on and off
else if(header.indexOf("GET /?state=on") >= 0) {
outputOn();
}
else if(header.indexOf("GET /?state=off") >= 0) {
outputOff();
}
// Set timer value
else if(header.indexOf("GET /?timer=") >= 0) {
pos1 = header.indexOf('=');
pos2 = header.indexOf('&');
valueString = header.substring(pos1+1, pos2);
timer = valueString.toInt();
EEPROM.write(2, timer);
EEPROM.commit();
Serial.println(valueString);
}
// Set LDR Threshold value
else if(header.indexOf("GET /?ldrthreshold=") >= 0) {
pos1 = header.indexOf('=');
pos2 = header.indexOf('&');
valueString = header.substring(pos1+1, pos2);
ldrThreshold = valueString.toInt();
EEPROM.write(3, ldrThreshold);
EEPROM.commit();
Serial.println(valueString);
}
// Web Page Heading
client.println("<body><h1>ESP8266 Web Server</h1>");
// Drop down menu to select mode
client.println("<p><strong>Mode selected:</strong> " + modes[selectedMode] + "</p>");
client.println("<select id=\"mySelect\" onchange=\"setMode(this.value)\">");
client.println("<option>Change mode");
client.println("<option value=\"0\">Manual");
client.println("<option value=\"1\">Auto PIR");
client.println("<option value=\"2\">Auto LDR");
client.println("<option value=\"3\">Auto PIR and LDR</select>");
// Display current state, and ON/OFF buttons for output
client.println("<p>GPIO - State " + outputState + "</p>");
// If the output is off, it displays the ON button
if(selectedMode == 0) {
if(outputState == "off") {
client.println("<p><button class=\"button\" onclick=\"outputOn()\">ON</button></p>");
}
else {
client.println("<p><button class=\"button button2\" onclick=\"outputOff()\">OFF</button></p>");
}
}
else if(selectedMode == 1) {
client.println("<p>Timer (0 and 255 in seconds): <input type=\"number\" name=\"txt\" value=\"" +
String(EEPROM.read(2)) + "\" onchange=\"setTimer(this.value)\" min=\"0\" max=\"255\"></p>");
}
else if(selectedMode == 2) {
client.println("<p>LDR Threshold (0 and 100%): <input type=\"number\" name=\"txt\" value=\"" +
String(EEPROM.read(3)) + "\" onchange=\"setThreshold(this.value)\" min=\"0\" max=\"100\"></p>");
}
else if(selectedMode == 3) {
client.println("<p>Timer (0 and 255 in seconds): <input type=\"number\" name=\"txt\" value=\"" +
String(EEPROM.read(2)) + "\" onchange=\"setTimer(this.value)\" min=\"0\" max=\"255\"></p>");
client.println("<p>LDR Threshold (0 and 100%): <input type=\"number\" name=\"txt\" value=\"" +
String(EEPROM.read(3)) + "\" onchange=\"setThreshold(this.value)\" min=\"0\" max=\"100\"></p>");
}
// Get and display DHT sensor readings
if(header.indexOf("GET /?sensor") >= 0) {
sensors.requestTemperatures();
temperatureString = " " + String(sensors.getTempCByIndex(0)) + "C " +
String(sensors.getTempFByIndex(0)) + "F";
client.println("<p>");
client.println(temperatureString);
client.println("</p>");
client.println("<p><a href=\"/\"><button>Remove Sensor Readings</button></a></p>");
}
else {
client.println("<p><a href=\"?sensor\"><button>View Sensor Readings</button></a></p>");
}
client.println("<script> function setMode(value) { var xhr = new XMLHttpRequest();");
client.println("xhr.open('GET', \"/?mode=\" + value + \"&\", true);");
client.println("xhr.send(); location.reload(true); } ");
client.println("function setTimer(value) { var xhr = new XMLHttpRequest();");
client.println("xhr.open('GET', \"/?timer=\" + value + \"&\", true);");
client.println("xhr.send(); location.reload(true); } ");
client.println("function setThreshold(value) { var xhr = new XMLHttpRequest();");
client.println("xhr.open('GET', \"/?ldrthreshold=\" + value + \"&\", true);");
client.println("xhr.send(); location.reload(true); } ");
client.println("function outputOn() { var xhr = new XMLHttpRequest();");
client.println("xhr.open('GET', \"/?state=on\", true);");
client.println("xhr.send(); location.reload(true); } ");
client.println("function outputOff() { var xhr = new XMLHttpRequest();");
client.println("xhr.open('GET', \"/?state=off\", true);");
client.println("xhr.send(); location.reload(true); } ");
client.println("function updateSensorReadings() { var xhr = new XMLHttpRequest();");
client.println("xhr.open('GET', \"/?sensor\", true);");
client.println("xhr.send(); location.reload(true); }</script></body></html>");
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
}
// Starts a timer to turn on/off the output according to the time value or LDR reading
now = millis();
// Mode selected (1): Auto PIR
if(startTimer && armMotion && !armLdr) {
if(outputState == "off") {
outputOn();
}
else if((now - lastMeasure > (timer * 1000))) {
outputOff();
startTimer = false;
}
}
// Mode selected (2): Auto LDR
// Read current LDR value and turn the output accordingly
if(armLdr && !armMotion) {
int ldrValue = map(analogRead(ldr), 0, 1023, 0, 100);
Serial.println(ldrValue);
if(ldrValue < ldrThreshold && outputState == "on") {
outputOff();
}
else if(ldrValue > ldrThreshold && outputState == "off") {
outputOn();
}
delay(100);
}
// Mode selected (3): Auto PIR and LDR
if(startTimer && armMotion && armLdr) {
int ldrValue = map(analogRead(ldr), 0, 1023, 0, 100);
Serial.println(ldrValue);
if(ldrValue < ldrThreshold) {
outputOff();
startTimer = false;
Serial.println("a");
}
else if(ldrValue > ldrThreshold && outputState == "off") {
outputOn();
Serial.println("b");
}
else if(now - lastMeasure > (timer * 1000)) {
outputOff();
startTimer = false;
Serial.println("c");
}
}
}
// Checks if motion was detected and the sensors are armed. Then, starts a timer.
void detectsMovement() {
if(armMotion || (armMotion && armLdr)) {
Serial.println("MOTION DETECTED!!!");
startTimer = true;
lastMeasure = millis();
}
}
void configureMode() {
// Mode: Manual
if(selectedMode == 0) {
armMotion = 0;
armLdr = 0;
// Status LED: off
digitalWrite(statusLed, LOW);
}
// Mode: Auto PIR
else if(selectedMode == 1) {
outputOff();
armMotion = 1;
armLdr = 0;
// Status LED: on
digitalWrite(statusLed, HIGH);
}
// Mode: Auto LDR
else if(selectedMode == 2) {
armMotion = 0;
armLdr = 1;
// Status LED: on
digitalWrite(statusLed, HIGH);
}
// Mode: Auto PIR and LDR
else if(selectedMode == 3) {
outputOff();
armMotion = 1;
armLdr = 1;
// Status LED: on
digitalWrite(statusLed, HIGH);
}
}
// Change output pin to on or off
void outputOn() {
Serial.println("GPIO on");
outputState = "on";
digitalWrite(output, LOW);
EEPROM.write(0, 1);
EEPROM.commit();
}
void outputOff() {
Serial.println("GPIO off");
outputState = "off";
digitalWrite(output, HIGH);
EEPROM.write(0, 0);
EEPROM.commit();
}
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