Garden lights and antitheft control with Arduino via Bluetooth

The idea was born a few days ago, I was a guest of a friend in his new villa with pool (lucky him!).
While we were strolling around the garden, we receive a call from another friend who tells us that for a few minutes was out of the gate with another large group of people (we were waiting for a while) who tried in every way (bell and trumpeted the horn) to “notify” their presence.
Once open the gate each of the newcomers has proposed a solution to replicate the sound of the bell, who has proposed to install a siren, who to include strobe lights like a disco and I proposed to replicate the bell, and maybe even open the gate on the computer.
At this point the owner, with an ironic tone, he asked me if I could do better and that the circuit have to be able to control the lights in the garden and irrigation system and check the status of microwave sensors installed to protect the garden.
After returning home I started thinking about how to resolve the issue.

I decided to design a software to run on PC that communicates via Bluetooth with a unit built around the Arduino and interfaced to the main power panel.
This led to the project “Automation Garden”.

Of course I designed the software and firmware for Arduino, although perfectly functional, but should be optimized, for lack of time (August 31 is the deadline for submissions), I send it anyway.

Let me explain briefly how it works:
the PC software communicates via Bluetooth (of course the PC must be equipped with built-in Bluetooth or USB) with another Bluetooth/RS232 HandyWave module connected to Arduino using the UART serial lines available on the pins 0 (RX) and 1 (TX).

To interface Arduino to the electrical panel I used some relay, and for interfacing it to alarm bells I used a circuit with optocouplers to avoid possible problems of shocks and surges that could destroy the Arduino.
I drew the schematic, but due to time constraints, I decided to temporarily mount it all on protoboard.

(Click Image to enlarge)

Before you start the software “Automazione_Giardino” on the PC, we associate, using the appropriate utility on the PC, the PC with the Bluetooth module mounted on the Arduino.
Once paired the Bluetooth and start the software, just select the checkbox associated to Bluetooth serial port and press the “Connect” button in the lower (see the location of these controls in the picture).
At this point, just click on the icon of the light bulbs to activated or deactivated the corresponding relay on the interface connected to the Arduino.
For the gate relay I planned pulse operation. Each time you press the icon associated with the relay opening the gate closes for 1s and then reopen.
To notify the alarm or intervention, even when the software is minimized, I provided a window that opens automatically when the event occurs and overrides any other application open on the PC.
Then just click on it to close.
The firmware installed on the Arduino does nothing more than to receive incoming commands on the serial port, interpret, active o deactive the relay and re-send the new state of the outputs or inputs. As mentioned previously the firmware should be optimized and maybe insert a checksum on the serial communication routines. But it works anyway.
You can use any other Bluetooth module perhaps with TTL output. Using a module with TTL output can eliminate RS232/TTL converter (MAX232 and boundary components) added to interface Arduino with Bluetooth HandyWave.
For those who haven’t a Bluetooth transmitter and want to try the circuit can without problems use Arduino connected via USB to the PC on which you installed the software and select the COM port assigned to the serial of Arduino.

Main Parts:

C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13

100nF 100uF 0,33uF 0,33uF 0,33uF 100nF 47uF 0,33uF 0,33uF 1uF 1uF 100nF 100nF

D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11

1N4007 4,8V 4,8V 1N4007 1N4007 LED LED LED LED LED LED

J1 K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 K12 U1 U2 U3 U4 U5

DB9 RELAY_G5V-2 RELAY_G5V-2 RELAY_G5V-2 RELAY_G5V-2 RELAY_G5V-2 RELAY_G5V-2 CONN_3_V CONN_3_V CONN_3_V CONN_3_V CONN_3_V CONN_3_V                                   7805 PHDARL PHDARL MAX232 ULN2803A

P1 P2 P3 P4 P5 P6 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12

CONN_6 CONN_8 CONN_2_V CONN_8 CONN_2_V CONN_2_V 10K 10K 270 270 470 470 300 300 300 300 300 300

Source Code:

// Sistema Di Automazione Giardino
// Felice Pascarelli 2011
// fpascar@tiscali.it
long ritardo =300;
byte rxrs232;
String ricezione = "";
String rele = "0";

String bufferrx = "0";
String uscite = "K";
String rel = "0";
String rel1 = "a";
String rel2 = "b";
String rel3 = "c";
String rel4 = "d";
String rel5 = "e";
String rel6 = "f";
String in1 = "2";
String in2 = "4";

void setup()
{
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, INPUT);
  pinMode(9, INPUT);
  pinMode(10, INPUT);
  pinMode(11, INPUT);
  pinMode(12, INPUT);
  Serial.begin(19200);
}

void loop()
{
  if (Serial.available() > 0)
    ricevirs232();
    ingressi();
  delay(ritardo);

      if(rel == "1")
      {
        if (rele == "A")
        {
          rel1 = rele;
          digitalWrite(2, HIGH);
        }
        if (rele == "B")
        {
          rel2 = rele;
          digitalWrite(3, HIGH);
        }
        if (rele == "C")
        {
          rel3 = rele;
          digitalWrite(4, HIGH);
        }
        if (rele == "D")
        {
          rel4 = rele;
          digitalWrite(5, HIGH);
        }
        if (rele == "E")
        {
          rel5 = rele;
          digitalWrite(6, HIGH);
        }
        if (rele == "F")
        {
          rel6 = rele;
          digitalWrite(7, HIGH);
          delay(1000);
          digitalWrite(7, LOW);
          rel6 = "f";
        }        

        if (rele == "a")
        {
          rel1 = rele;
          digitalWrite(2, LOW);
        }
        if (rele == "b")
        {
          rel2 = rele;
          digitalWrite(3, LOW);
        }
        if (rele == "c")
        {
          rel3 = rele;
          digitalWrite(4, LOW);
        }
        if (rele == "d")
        {
          rel4 = rele;
          digitalWrite(5, LOW);
        }
        if (rele == "e")
        {
          rel5 = rele;
          digitalWrite(6, LOW);
        }
        if (rele == "f")
        {
          rel6 = rele;
          digitalWrite(7, LOW);
        }        

        rel = "0";     

      }
        Serial.print(rel1);Serial.print(rel2);Serial.print(rel3);Serial.print(rel4);
        Serial.print(rel5);Serial.print(rel6);Serial.print(in1);Serial.print(in2);
}

void ingressi()
{
  if (digitalRead(8) == 0)
  {
    in1 = "1";
  }
    if (digitalRead(8) == 1)
  {
    in1 = "2";
  }
    if (digitalRead(9) == 0)
  {
    in2 = "3";
  }
    if (digitalRead(9) == 1)
  {
    in2 = "4";
  }
}

void ricevirs232()
{
  if (Serial.available() > 0)
  {

    rxrs232 = Serial.read();

    if (isDigit(rxrs232))
    {
      ricezione += (char)rxrs232;
    }
    if(rxrs232 =='A' || rxrs232 =='B'|| rxrs232 =='C'|| rxrs232 =='D'|| rxrs232 =='E'|| rxrs232 =='F'
    ||rxrs232 =='a'|| rxrs232 =='b'|| rxrs232 =='c'|| rxrs232 =='d'|| rxrs232 =='e'|| rxrs232 =='f')
     {
      rele = rxrs232,BYTE;
      rel = "1";
     }
  }   

}

Download

 Software
 
 Arduino sketch
 
 PCB design (Kicad)