FM Transmitter 25 Watts ( 88 - 108 MHz)

This Transmitter is made from the MP3 modulator with having 5 stages

with a maximum 25 Watts RF power


Driver circuit between modulator & RF section below 

coil will be  0.1 mH

Arduino Bluetooth Remote Control (Updated )

Arduino Bluetooth  Remote Control

Output taken from Ardiuno 2 & 4 pins, Bluetooth device connected at 6 & 7 pins

For 30Amps Relay 2SC1384 used connected to pin 2, C945 for 10 Amps Relay connected to pin 4 . In Android application Buttons 1 & 3 will work.

Search Bluetooth device first enter 0000 password, 

Now start app in Android  press connection button ,it will be green  below it show the connection status 

Then you on or off any Appliances

Application link:

https://apkpure.com/p/dev.merahkemarun.arduinobluetoothrelay4ch

KIT: 3,000 PKR

#include <SoftwareSerial.h>
SoftwareSerial mySerial(7, 6);
#define relay1 2
#define relay2 3
#define relay3 4
#define relay4 5
char val;
void setup() {
pinMode(relay1,OUTPUT);
pinMode(relay2,OUTPUT);
pinMode(relay3,OUTPUT);
pinMode(relay4,OUTPUT);
digitalWrite(relay1,LOW);
digitalWrite(relay2,LOW);
digitalWrite(relay3,LOW);
digitalWrite(relay4,LOW);
mySerial.begin(9600);
Serial.begin(9600);
}
void loop() {
//cek data serial from bluetooth android App
while ( mySerial.available() >0 ) {
val = mySerial.read();
Serial.println(val);
}
//Relay is on


if( val == '1' ) {
digitalWrite(relay1,HIGH); }
else if( val == '2' ) {
digitalWrite(relay2,HIGH); }
else if( val == '3' ) {
digitalWrite(relay3,HIGH); }
else if( val == '4' ) {
digitalWrite(relay4,HIGH); }
//relay all on
else if( val == '9' ) {
digitalWrite(relay1,HIGH);
digitalWrite(relay2,HIGH);
digitalWrite(relay3,HIGH);
digitalWrite(relay4,HIGH);
}
//relay is off
else if( val == 'A' ) {
digitalWrite(relay1,LOW); }
else if( val == 'B' ) {
digitalWrite(relay2,LOW); }
else if( val == 'C' ) {
digitalWrite(relay3,LOW); }
else if( val == 'D' ) {
digitalWrite(relay4,LOW); }
//relay all off
else if( val == 'I' ) {
digitalWrite(relay1,LOW);
digitalWrite(relay2,LOW);
digitalWrite(relay3,LOW);
digitalWrite(relay4,LOW);
}
}

Arduino GPS Tracker

Below is a complete GPS GSM Car Tracker

                  HEX not for free

Having a below  specifications:


1). Get GPS coordinates by sending a SMS.

2). Get alert if door or bonnet open.

3). Lock your car any time by sending SMS.

4). Get Call & SMS while some one open the door or bonnet

 Here in this project were need up to 5 VDC for GSM ,GPS , controller & relays .

Following  parts were used:

1). 3V to 5V DC Step up 
2).  3.7 , 2Amps mobile battery 
3). Car charger 2Amps
4). On/off button
5). 1000uf ,16v capacitor
6). Small size Rectifier bridge 

    ----------------------------------------

check video:

https://www.youtube.com/watch?v=QGYTBDkDp_o&t=13s

   

GSM Based Home Automation System using Arduino

Below mentioned simple GSM arduino project where you can control any thing through GSM module . 
Here SIM900A used , need 3.7 , 2 Amps power supply must for SIM module , ground must common .

Simple AT commands use to get output from the module , Pin 7 & 8 of Arduino used as TX & TX for GSM module .  for controlling any appliance any pin can be used  

Codes are below

#include <SoftwareSerial.h> // Library for using serial communication

SoftwareSerial SIM900(8, 7); // Pins 7, 8 are used as used as software serial pins

String incomingData;   // for storing incoming serial data

String message = "";   // A String for storing the message

int relay_pin = 9 ;    // Initialized a pin for relay module

void setup()

{

  Serial.begin(115200); // baudrate for serial monitor

  SIM900.begin(9600); // baudrate for GSM shield

  pinMode(relay_pin, OUTPUT);   // Setting erlay pin as output pin

  digitalWrite(relay_pin, HIGH);  // Making relay pin initailly low

  // set SMS mode to text mode

  SIM900.print("AT+CMGF=1\r");  

  delay(100);

  

  // set gsm module to tp show the output on serial out

  SIM900.print("AT+CNMI=2,2,0,0,0\r"); 

  delay(100);

}

void loop()

{

  //Function for receiving sms

  receive_message();

  // if received command is to turn on relay

  if(incomingData.indexOf("Led_on")>=0)

  {

    digitalWrite(relay_pin, LOW);

    message = "Led is turned ON";

    // Send a sms back to confirm that the relay is turned on

    send_message(message);

  }

  

  // if received command is to turn off relay

  if(incomingData.indexOf("Led_off")>=0)

  {

    digitalWrite(relay_pin, HIGH);

    message = "Led is turned OFF";

    // Send a sms back to confirm that the relay is turned off

    send_message(message);

  }        

}

void receive_message()

{

  if (SIM900.available() > 0)

  {

    incomingData = SIM900.readString(); // Get the data from the serial port.

    Serial.print(incomingData); 

    delay(10); 

  }

}

void send_message(String message)

{

  SIM900.println("AT+CMGF=1");    //Set the GSM Module in Text Mode

  delay(100);  

  SIM900.println("AT+CMGS=\"+92xxxxxxxxxx\""); // Replace it with your mobile number

  delay(100);

  SIM900.println(message);   // The SMS text you want to send

  delay(100);

  SIM900.println((char)26);  // ASCII code of CTRL+Z

  delay(100);

  SIM900.println();

  delay(1000);  

}