Motion Sensor and Led control with blynk


I just finish my prototype about use a motion sensor as a surveillance system from my home. the idea is create a box with arduino and several sensors and actuators like:

  • 2 LED with intensity control
  • 1 Humidity and temperature sensor (DHT11)
  • photoresistor
  • Motion sensor

with this hardware setup I want to reach the follow Items:

  • detect movement when I activate a bottom, If not activated motion sensor disabled.
  • to know when the alarm is activated
  • control both LEDS independently with ligth regulator
  • To know in which luminosoty state are the LEDS
  • see the temperature
  • see the humidity
  • see the thermal feeling (feature of the DHT11 library)
  • see the luminosity
  • see how many time my device is ON
  • see the values on a graph
  • locate my device on a map
  • notify when temperature is high
  • notify when humidity is high
  • notify when luminosity is high
  • launch a sound through a lodspeakes
  • send control parameters by serial port to control the variable states.

On the begining my hardware was an Arduino UNO + ESP8266-01 as a wifi shield but the ESP8266 on this behavior is too slow and the Arduino get freeze too often.
So I decide to use an Ethernet shield instead the ESP8266 and the performance looks great¡¡

here some screens about the dashboard:

here my code that I use:

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial

#include <SPI.h>
#include <Ethernet.h>
#include <BlynkSimpleEthernet.h>

char auth[] = "ooooooo";

#define W5100_CS  10
#define SDCARD_CS 4
#include <DHT.h>

int LDR = A1;
const int LEDPin = 13;        // pin para el LED
const int PIRPin = 8;         // pin de entrada (for PIR sensor)
int val = LOW;                  // estado del pin
int lux;
int alarma = 0;
int ultalarma = 0;
int led1 = 5;
int led2 = 6;
int estled1 = 0;
int estled2 = 0;
float t;
float h;
float hif;

#define DHTPIN 7          // What digital pin we're connected to
#define DHTTYPE DHT11     // DHT 11

BlynkTimer timer;
WidgetMap myMap(V1);
void setup()
  pinMode(PIRPin, INPUT);
  pinMode (9, OUTPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(LEDPin, OUTPUT);

  // Debug console

  digitalWrite(SDCARD_CS, HIGH); // Deselect the SD card



  timer.setInterval(700L, notis);
  timer.setInterval(1000L, sensores);
  timer.setInterval(10000L, sensores2);
  timer.setInterval(3000L, sensores3);
  myMap.location(2, ******, -********, "caseta");
  myMap.location(1, ********, ******, "casa");


void loop()

void movimiento() {
  if (alarma==HIGH){
      val = digitalRead(PIRPin);
  if (val == HIGH) {
    digitalWrite(LEDPin, HIGH);
    tone(9, 659.26, 100);
  else {
    digitalWrite(LEDPin, LOW);
    val = LOW;
void sensores2() {
  Blynk.virtualWrite(V5, h);
  Blynk.virtualWrite(V6, t);

  Serial.println(" humedad");
  Serial.println(" temp");


void sensores3() {
  Blynk.virtualWrite(V7, millis() / 1000);
  Blynk.virtualWrite(V16, hif);
  Blynk.virtualWrite(V8, lux);
  Serial.print( millis() / 1000);
  Serial.println(" segundos");
  Serial.println(" sensacion termica");
  Serial.println(" lux");
void sensores() {
  Blynk.virtualWrite(V10, estled1);
  Blynk.virtualWrite(V12, estled2);
  Blynk.virtualWrite(V15, alarma);

  Serial.println(" led1");
  Serial.println(" led2");
  Serial.println(" 1 +1  alarma ON");
void notis() {
  h = dht.readHumidity();
  t = dht.readTemperature();
  hif = dht.computeHeatIndex(t, h);
  lux = analogRead(LDR);
  if (val == HIGH) {
    Blynk.notify("caseta MOVIMIENTO!");
  if (t >= 33) {
    Blynk.notify("caseta alta temperatura!");
  if (h >= 80) {
    Blynk.notify("caseta alta humedad!");
  if (lux >= 980) {
    Blynk.notify("caseta iluminacion");
  Serial.println(" notis");

  estled1 = param.asInt();
  analogWrite(led1, estled1);
  estled2 = param.asInt();
  analogWrite(led2, estled2);

  alarma = param.asInt(); // assigning incoming value from pin V14 to a variable


The project works very nice and only remains to put all hardware on a plastic box and conect close to the main gate of my home to get control of the intruders when I will be out of home¡¡¡


hola puedes compartir el codigo QR de blynk? Gracias

Hi, can you share how all the components/modules/board are connected? I want to make similar projects but less items to control my hydroponics small garden. I want to control water pump manually and/or by timers and monitor some sensors. Kindly please share. Thanks in advance.

Your project doesn’t sound very similar to the original project.
And, it’s fairly easy to work-out how it’s all connected if you look at the code - not that this will help you with your hydropinics project.

I think you’ll find that your comment will be moved to a thread of it’s own by @Gunner

I see that you posted this request for information just 3 hours after joining the forum. A little more time spent searching would have turned-up many projects that are designed to manage the process of watering gardens based on timers and moisture sensors, which would be a much better starting point for you.


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