IoT Controlling Fridge using ESP8266 Wifi Module
IoTAfter setting up the mind to Control Fridge using my Smart Phone. I downloaded Arduino and saw the examples they gave given for ESP8266 Wifi Module.
There are many examples given in Arduino.
I made the Simple Home Controller API in MongoDB where we can set the status of the Equipment (Fridge).
Here's the look
Pic : Device Off & On Status
Then, I grabbed the examples that is given in Arduino and customized to my need. Here is it.
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClientSecureBearSSL.h>
const uint8_t fingerprint[20] = {0x3E, 0x42, 0x9E, 0x36, 0x5D, 0x25, 0x07, 0xB3, 0x77, 0xB4, 0xAC, 0x7C, 0x26, 0xD7, 0x6F, 0x9A, 0xCD, 0xEB, 0x7B, 0x32};
ESP8266WiFiMulti WiFiMulti;
//const char* ssid = "SULTHAN";
//const char* password = "9042445010";
const char* ssid = "SA";
const char* password = "1234567890";
//int wait_time = 10000; // Prod timing
int wait_time = 2000;
int inputPin = D6;
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
pinMode(inputPin, OUTPUT); // set pin as input
// Setting power off at initial stage
digitalWrite(inputPin,HIGH);
digitalWrite(LED_BUILTIN, HIGH); // sets the LED to the button's value
Serial.begin(9600);
Serial.println();
Serial.println();
Serial.println();
for (uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] Wait %d...\n", t);
Serial.flush();
delay(1000);
}
WiFi.mode(WIFI_STA);
WiFiMulti.addAP(ssid, password);
}
void loop() {
// wait for WiFi connection
if ((WiFiMulti.run() == WL_CONNECTED)) {
std::unique_ptr<BearSSL::WiFiClientSecure>client(new BearSSL::WiFiClientSecure);
client->setFingerprint(fingerprint);
HTTPClient https;
if (https.begin(*client, "http://sulthanallaudeen.com:3000/getDeviceStatus")) { // HTTPS
int httpCode = https.GET();
if (httpCode > 0) {
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
String payload = https.getString();
Serial.println(payload);
if(payload=="on"){
digitalWrite(inputPin,LOW);
digitalWrite(LED_BUILTIN, LOW); // sets the LED to the button's value
Serial.println("Turn on");
} else if (payload=="off"){
Serial.println("Turn off");
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
digitalWrite(inputPin,HIGH);
} else {
Serial.println("Invalid status");
}
}
} else {
Serial.printf("[HTTPS] GET... failed, error: %s\n", https.errorToString(httpCode).c_str());
}
https.end();
} else {
Serial.printf("[HTTPS] Unable to connect\n");
}
}
String console = "Wait for " + (String)wait_time + "s before next round...";
Serial.println(console);
delay(wait_time); // Wait for 10 seconds
}
What it does ?
Step 1: Generated fingerprint as my website is https
Step 2: Connect to wifi (loop until it gets connected)
Step 3: Hit the API to get Device Status ( Do it in a particular interval, Say 1 minute)
Step 4: Based on the Response, turn on or turn off the switch (Power Relay which is connected to the Fridge)
So, now I can set the Device's status from my Mobile that will be watched periodically by the ESP and the preference will be done to the connected Equipment.
Note : Instead of trying to Fridge you can simulate the same to low power equipment for a safety measure