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#18 Smart House Project With PicoBricks

10 Nov 2023
#18 Smart House Project With PicoBricks

Workplaces, factories, homes and even animal shelters… There are different electronic systems that can be used to protect our living spaces against intruders. These systems are produced and marketed as home and workplace security systems. There are systems where the images produced by security cameras are processed and interpreted, as well as security systems that detect the human body and its movements with sensors and take action. Security systems are set up like a kind of alarm clock and give audible and visual warnings when an unidentified activity is detected in the specified zone. It notifies the business or the homeowner, and it can also make automatic notifications to the security companies.

 In cases of gas leakage, fire etc., gas sensors are used in homes and workplaces to prevent poisoning. In a problem situation, people living in the environment are alerted by a loud alarm.

We will prepare a model smart home project with PicoBricks using the HC-SR501 and MQ-2 gas sensor. This sensor HC-SR501, is also known as PIR sensor. Passive infrared (PIR) sensors use a pair of pyroelectric sensors to detect heat energy in the surrounding environment. These two sensors sit beside each other, and when the signal differential between the two sensors changes (if a person enters the room, for example), the sensor will engage.

Details and Algorithm

When the HC-SR501 PIR sensor detects motion, it gives digital output for 3 seconds. We will use a Picoboard, buzzer and button LED module in the project. All parts must be in the model.

When the program starts, the button must be pressed to activate the alarm system. After pressing the button, we must wait 3 seconds to allow for the hand to be pulled out of the model. At the end of 3 seconds, the red LED lights up and the alarm system is activated. When the alarm system detects a movement, the red LED will start to flash and the buzzer will sound the alarm. To mute it, PicoBricks must be restarted.

The MQ-2 sensor is always on. When it detects a toxic gas, it will notify you with a buzzer and flashing red LED.


1X PicoBricks
1X HC-SR501 PIR sensor
1X MQ-2 Gas sensor
1X Mini breadboard
Jumper Cables
Easy Connection Cables

Wiring Diagram

You can code and run Picobricks’ modules without wiring. If you are going to use the modules by separating them from the board, you should make the module connections with grove cables.

Construction Stages of the Project

To run the project, you have to turn a cardboard box into a model house. You will need scissors, pencils, tape, glue, and a utility knife. Draw windows and doors on the box with a pencil. Cut the door section with a utility knife.

You can use another cardboard to make the roof part.

Attach double-sided foam tape under the PicoBricks pieces.

Place pieces of PicoBricks inside the model house. Position the PIR sensor to see the door directly from the inside. attach the button module just above the door from the inside.

When you connect the battery case to Picoboard and turn it on, the code will start to run. 3 seconds after pressing the button, the alarm system will be activated and the red LED will turn on. As soon as you put your hand in the door, the buzzer will start to sound.


smart house project with rasperry pi

When you hold the lighter gas inside the house, the alarm system is expected to be activated again.

MicroBlocks Codes of the PicoBricks

You can access the Microblocks codes of the project by dragging the image to the Microblocks Run tab or click the button.


Microblocks Run Tab

MicroPython Codes of the PicoBricks

import time
import network
import socket
from machine import Pin, ADC
from picobricks import SSD1306_I2C, DHT11
from time import sleep
WIDTH = 128
i2c=machine.I2C(0,sda=sda, scl=scl, freq=1000000)
oled = SSD1306_I2C(WIDTH, HEIGHT, i2c)

motor_1 = Pin(21, Pin.OUT)
motor_2 = Pin(22, Pin.OUT)

dht_sensor = DHT11(Pin(11))
dht_read_time = time.time() # Defined a variable to keep last DHT11 read time

#Connect to Wifi
ssid = "WiFi ID"
password = "WiFi Password"
wlan = network.WLAN(network.STA_IF)
wlan.connect(ssid, password)
max_wait = 10
status = wlan.ifconfig()

oled.text("Power On",30,0)
oled.text("Waiting for ",20, 30)
oled.text("Connection",23, 40)

while max_wait > 0:
    if wlan.status() < 0 or wlan.status() >= 3:
    max_wait -=1
    print("waiting for connection...")
if wlan.status() !=3:
    print('network connection failed. Please Check ID and PASSWORD')
    status = wlan.ifconfig()
    print( 'ip = ' + status[0] )


html = """<!DOCTYPE html><html>
<head><meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="data:,">
<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}
.buttonBlue { background-color: #0000FF; border: 2px solid #000000;; color: white; padding: 20px 32px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; }
.buttonOrange { background-color: #FFA500; border: 2px solid #000000;; color: Black; padding: 20px 32px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; }
text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}
<body><center><h1>Smart Green House</h1></center><br><br>
<center> <button class="buttonBlue" name="watering" value="watering" type="submit">WATERING</button>
<center> <button class="buttonOrange" name="check" value="status" type="submit">Check Status</button>
html2 = """<!DOCTYPE html><html>
<head><meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="data:,">


# Open socket
addr = socket.getaddrinfo('', 80)[0][-1]
s = socket.socket()
print('listening on', addr)
oled.text("IP",50, 0)
oled.text(str(status[0]),20, 20)
oled.text("Connected",25, 40)
# Listen for connections, serve client
tempexp = str()
humexp = str()
soilexp = str()
while True:
    if time.time() - dht_read_time >= 3:
        dht_read_time = time.time()
        except Exception as e:
        cl, addr = s.accept()
        print('client connected from', addr)
        request = cl.recv(1024)
        request = str(request)
        watering = request.find('watering')
        checkstt = request.find('check')
        print( 'watering = ' + str(watering))
        print( 'checkstt = ' + str(checkstt))
        if watering == 8: # Sulama
            if watering == 8:
                dhtstt = "Watering for 1 sec..."
        else: # Info
            dhtstt = "VALUES"
            soilstt = "Soil Sensor Value: "
            soilexp = str(smo) + "%"
            humexp = "Huminity: " +  str(hum) + "% "
            tempexp = "Temperature: "+ str(temp) + "% "
        # Create and send response
        stateis2 = tempexp + humexp + " Soil: " + soilexp
        stateis = dhtstt
        response2 = html2 % stateis2
        response = html % stateis
        cl.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
    except OSError as e:
        print('connection closed')

Arduino C Codes of the PicoBricks


#include <DHT.h>
#define RX 0
#define TX 1

#define LIMIT_TEMPERATURE     30
#define DHTPIN                11
#define DHTTYPE               DHT11
#define smo_sensor            27
#define motor                 22
#define DEBUG true

int connectionId;

void setup() {
  pinMode(smo_sensor, INPUT);
  pinMode(motor, OUTPUT);

  sendData("AT+RST\r\n", 2000, DEBUG); // reset module
  sendData("AT+GMR\r\n", 1000, DEBUG); // configure as access point
  sendData("AT+CIPSERVER=0\r\n", 1000, DEBUG); // configure as access point
  sendData("AT+RST\r\n", 1000, DEBUG); // configure as access point
  sendData("AT+RESTORE\r\n", 1000, DEBUG); // configure as access point
  sendData("AT+CWMODE?\r\n", 1000, DEBUG); // configure as access point
  sendData("AT+CWMODE=1\r\n", 1000, DEBUG); // configure as access point
  sendData("AT+CWMODE?\r\n", 1000, DEBUG); // configure as access point
  sendData("AT+CIFSR\r\n", 1000, DEBUG); // get ip address
  sendData("AT+CIPMUX=1\r\n", 1000, DEBUG); // configure for multiple connections
  sendData("AT+CIPSERVER=1,80\r\n", 1000, DEBUG); // turn on server on port 80

void loop() {
  if (Serial1.find("+IPD,")) {
    connectionId = - 48;
    String serialIncoming = Serial1.readStringUntil('\r');

    if (serialIncoming.indexOf("/WATERING") > 0) {
      Serial.println("Irrigation Start");
      digitalWrite(motor, HIGH);
      delay(1000); // 10 sec.
      digitalWrite(motor, LOW);
      Serial.println("Irrigation Finished");
      Serial.println("! Incoming connection - sending WATERING webpage");
      String html = "";
      html += "<html>";
      html += "<body><center><H1>Irrigation Complete.<br/></H1></center>";
      html += "</body></html>";
    if (serialIncoming.indexOf("/SERA") > 0) {

      float smo = analogRead(smo_sensor);
      float smopercent = (460-smo)*100.0/115.0 ; //min ve max değerleri değişken.
      Serial.print("SMO: %");

      float temperature = dht.readTemperature();
      Serial.print("Temp: ");

      float humidity = dht.readHumidity();
      Serial.print("Hum: ");
      Serial.println("! Incoming connection - sending SERA webpage");
      String html = "";
      html += "<html>";
      html += "<body><center><H1>TEMPERATURE<br/></H1></center>";
      html += "<center><H2>";
      html += (String)temperature;
      html += " C<br/></H2></center>";

      html += "<body><center><H1>HUMIDITY<br/></H1></center>";
      html += "<center><H2>";
      html += (String)humidity;
      html += "%<br/></H2></center>";  
      html += "<body><center><H1>SMO<br/></H1></center>";
      html += "<center><H2>";
      html += (String)smopercent;
      html += "%<br/></H2></center>";  
      html += "</body></html>";
      Serial.println("! Incoming connection - sending MAIN webpage");
    String html = "";
    html += "<html>";
    html += "<body><center><H1>CONNECTED.<br/></H1></center>";
    html += "<center><a href='/SERA'><h4>INFO:Get Sensor Data</a></br><a href='/WATERING'>WATERING:Run Water Pump</a></h4></center>";
    html += "</body></html>";
    String closeCommand = "AT+CIPCLOSE=";  ////////////////close the socket connection////esp command
    closeCommand += connectionId; // append connection id
    closeCommand += "\r\n";
    sendData(closeCommand, 3000, DEBUG);


//////////////////////////////sends data from ESP to webpage///////////////////////////

void espsend(String d)
  String cipSend = " AT+CIPSEND=";
  cipSend += connectionId;
  cipSend += ",";
  cipSend += d.length();
  cipSend += "\r\n";
  sendData(cipSend, 1000, DEBUG);
  sendData(d, 1000, DEBUG);

//////////////gets the data from esp and displays in serial monitor///////////////////////

String sendData(String command, const int timeout, boolean debug)
  String response = "";
  long int time = millis();
  while ( (time + timeout) > millis())
    while (Serial1.available())
      char c =; // read the next character.
      response += c;

  if (debug)
    Serial.print(response); //displays the esp response messages in arduino Serial monitor
  return response;
GitHub Project Page
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