Generator start Timer ( on Low Battery capacity )

This simple project can set the generator in automatic way to start the generator on low battery level
specially for running network system

#include <LiquidCrystal.h>  //Default Arduino LCD Librarey is included

int Read_Voltage  = A0;
int Read_CUTOFF  = A1;
int led  = 8;
int led1  = 9;
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; //Mention the pin number for LCD connection
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  lcd.begin(16, 2); //Initialise 16*2 LCD
  pinMode(8, OUTPUT);
   pinMode(9, OUTPUT);
  lcd.print("KSF ELECTRONICS"); //Intro Message line 1
  lcd.setCursor(0, 1);

  delay(3000);
  lcd.clear();
}
void loop() {

 float Voltage_Value = analogRead(Read_Voltage);
 float CUTOFF_Value = analogRead(Read_CUTOFF);
Voltage_Value = Voltage_Value * (5.0/1023) * 6;
 CUTOFF_Value = CUTOFF_Value * (5.0/1023) * 6;

 lcd.setCursor(0, 0);
 lcd.print("VOLT="); lcd.print(Voltage_Value);
 lcd.print(" VDC ");
 lcd.setCursor(0, 0);
 lcd.print("VOLT="); lcd.print(Voltage_Value);


lcd.setCursor(0, 1);
 lcd.print("CUT ="); lcd.print(CUTOFF_Value);
 lcd.print(" VDC ");
 lcd.setCursor(0, 1);
 delay(200);

if(Voltage_Value < CUTOFF_Value)
digitalWrite(8 , HIGH);
delay(200000);
digitalWrite(8 ,LOW);
}

Russian PI metal detector circuit.

Russian PI metal detector circuit.
Classical Russian PI detector where only few components were used working fine
LM555 , TL062 , IRF 740 or 840 . ( IXQT0460P2 in my case)

Contentious tone from speaker but change in tone if metal found 

Testing video click below link

https://www.youtube.com/watch?v=8ApYCEoK97Q

Arduino Bluetooth Remote Control (Home Appliances)

Very common Bluetooth Remote control

Programming Arduino Nano  from Arduino UNO 

1). Remove Atmega 328 from Arduino UNO 
2).  Connect Arduino UNO  pin RX to Arduino Nano RX
3).  Connect Arduino UNO  pin TX to Arduino Nano TX
4). Select COM 6 ,as Arduino UNO on COM 6

Simple programming but need to be updated 

#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); //Pin10 RX , Pin 11 TX connected to--> Bluetooth TX,RX
#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,HIGH);
digitalWrite(relay2,HIGH);
digitalWrite(relay3,HIGH);
digitalWrite(relay4,HIGH);
mySerial.begin(9600);
Serial.begin(9600);
}
void loop() {
//cek data serial from bluetooth android App
if( mySerial.available() >0 ) {
val = mySerial.read();
Serial.println(val);
}
//Relay is on


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

CAR FAST MOBILE CHARGER

Below is a simple car mobile charger made from a classical power regulator IC 317
Here only 3 components were used ,
Which are LM317 ,560R, 5K (variable) .
Simply adjust voltages to 8.7 V DC (for fast Charging support mobiles).
Actually in adaptive fast charger there are 2 outputs 5V & 9V .Any mobile supporting fast
charging send a single to the a small chip inside charger ,which will switch 5V to 9V to mobile Set .

ARDUINO FM RADIO

Here is a simple FM radio with Ardiuno  board ,
Which required popular Radio module called  RDA5807M.

The RDA5807M series support frequency range is from 50MHz to 115MHz.

Easily available in the market

i simply find this module in MP3 players available in the market ,

this modules is without 32khz crystal, you need to placed this crystal on the IC 6 pin & to the ground

You must have Libraries like -------Wire.h ----    TEA5767Radio.h   -------    LiquidCrystal.h   

Here in Code TEA5767Radio were used , it will support RDA5807M Chip.

Also remember these two pins must be proper

  * Arduino Pin A5  =  Radio Chip Pin SDA  
 * Arduino Pin A4   =  Radio Chip Pin SCL   

1 ----> Arduino SDA
2 ----> Arduino SCL
3 ----> GND
5 ----> +5V
6 ----> GND
7 ----> Audio out (right channel)
8 ----> Audio out (left channel)
10 ---> Antenna

 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * Arduino SDA PIN A5
 * Arduino SCL PIN A4
 * ends to +5V and ground
 * UP SEARCH (A0)
 * DOWN SEARCH (A1)
-----------------------------------------------------------------
#include <Wire.h>                             
#include <TEA5767Radio.h>                     
#include <LiquidCrystal.h>                   
                                             
                                             
TEA5767Radio radio = TEA5767Radio();         
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);           
float frequency = 0;                         
int fUP = A0;                                 
int fDOWN = A1;                             
int count = 0;                                 


void setup()
{
  delay(1000);
  Wire.begin();
  frequency = 96.0;                       //starting frequency

  radio.setFrequency(frequency);
  lcd.begin(16,2);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("FM: ");
  lcd.setCursor(0, 1);
  lcd.print(frequency);

}

void loop()
{

  if(digitalRead(fUP))                   
  {
    count=0;
    while (digitalRead(fUP))
    {
      count++;
      if(count > 0 && count <= 6)       
      {
        frequency += 0.1;
        frequencyUpdate();
        delay(200);
      }
      else if (count > 6 && count <= 2) 
      {
        frequency += 0.1;
        frequencyUpdate();
        delay(80);
      }
      else                             
      {
        frequency += 0.1;
        frequencyUpdate();
        delay(5);
      }
    }

  }



   if(digitalRead(fDOWN))                 
   {
     count = 0;
    while (digitalRead(fDOWN))         
    {
      count--;
      if(count < 0 && count >= -6)
      {
        frequency -= 0.1;
        frequencyUpdate();
        delay(200);
      }
      else if (count < -6 && count >= -12)
      {
        frequency -= 0.1;
        frequencyUpdate();
        delay(80);
      }
      else                               
      {
        frequency -= 0.1;
        frequencyUpdate();
        delay(5);
      }
    }
   }

}


void frequencyUpdate()                    //this function changes the frequency of the station, is called by preset and frequency up/down conditions.
{
  frequency = constrain(frequency, 50.0, 115.0);     //50MHz to 115MHz.
  lcd.setCursor(0,0);
  lcd.print("KSF FM:");
  lcd.setCursor(0,1);
  lcd.print(frequency);
  radio.setFrequency(frequency);
}

2 PHASE AC STABILIZER ( ARDUINO BASED)

Below Mentioned circuit

#include <LiquidCrystal.h>

// number of analog samples to take per reading, per channel
#define NUM_SAMPLES 30
// voltage divider calibration values
#define DIV_1    58.13465
#define DIV_2    58.07185
#define DIV_3    58.07185
#define DIV_4    58.07185
// ADC reference voltage / calibration value
#define V_REF    4.991
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int sum[4] = {0};                // sums of samples taken
unsigned char sample_count = 0;  // current sample number
float voltage[4] = {0.0};        // calculated voltages
char l_cnt = 0;                  // used in 'for' loops

int pinButton = 6; //the  button -- 12 PIN
int LED = 7; //the pin we connect the LED--13 PIN
int RELAY = 8; //the pin we connect the RELAY --14 PIN
int ON = 9; //the pin we connect the --15 PIN
int OFF = 10; //the pin we connect the --16 PIN
int phase1 = A0; //the pin we connect the -- 23 PIN
int phase2 = A1; //the pin we connect the -- 24 PIN
void setup()

{

    lcd.begin(16, 4);     // main lcd starting point
    lcd.setCursor(0,1);
    lcd.print("KSF ELECTRONICS");
    delay(1000);
    lcd.clear();
    lcd.setCursor(0,1);
    lcd.print(" obaidkakar.");
    lcd.setCursor(0,2);
    lcd.print(" blogspot.com");
    delay(1000);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("   WARNING   ");
    lcd.setCursor(0,1);
    lcd.print("After button on ");
    lcd.setCursor(0,2);
    lcd.print("Motor will start");
    lcd.setCursor(0,3);
    lcd.print("in 13 Seconds");
    delay(1000);
    lcd.clear();  // clear screen
    pinMode(pinButton, INPUT); //set the button pin as INPUT
    pinMode(LED, OUTPUT); //set the LED pin as OUTPUT
    pinMode(RELAY, OUTPUT); //set the LED pin as OUTPUT
    pinMode(ON, OUTPUT);
    pinMode(OFF, OUTPUT);
    pinMode(phase1, INPUT);
    pinMode(phase2, INPUT);
    Serial.begin(9600);
    }
    void loop()
    {
    // take a number of analog samples and add them up
    while (sample_count < NUM_SAMPLES) {
        // sample each channel A2 to A5
        for (l_cnt = 0; l_cnt < 4; l_cnt++) {
            sum[l_cnt] += analogRead(A2 + l_cnt); // input were given to lcd
        }
        sample_count++;
        delay(40);
    }
    // calculate the voltage for each channel
    for (l_cnt = 0; l_cnt < 4; l_cnt++) {
        voltage[l_cnt] = ((float)sum[l_cnt] / (float)NUM_SAMPLES * V_REF) / 1024.0;
    }
    // display voltages on LCD
    // each voltage is multiplied by the resistor network
    // division factor to calculate the actual voltage
    // voltage 1 - A (pin A2)
 
    lcd.setCursor(0, 0);
    lcd.print("SETTING ");
    lcd.print(voltage[2] * DIV_3, 1); // pin A4--Setting --27 PIN
    lcd.print(" AC ");
    lcd.setCursor(0, 1);
    lcd.print("PHASE1  ");
    lcd.print(voltage[0] * DIV_1, 1); // pin A2-- PHASE 1--25 PIN
    lcd.print(" AC ");
    lcd.setCursor(0, 2);
    lcd.print("PHASE2  ");
    lcd.print(voltage[1] * DIV_2, 1); // pin A3 --PHASE 2--26 PIN
    lcd.print(" AC ");
    lcd.setCursor(0, 3);
     lcd.print("OUTPUT  ");
    lcd.print(voltage[3] * DIV_4, 1); // pin A5--Output--28 PIN
    lcd.print(" AC ");
     if(voltage[1]== 0){
      lcd.clear();
    lcd.setCursor(0,1);
    lcd.print("PHASE2 MISSING  ");
 
     }
    if(voltage[0]== 0){
      lcd.clear();
    lcd.setCursor(0,2);
    lcd.print("PHASE1 MISSING  ");
 
    delay(10);
    }
 // voltage 4 - D (pin A5)
    // reset count and sums
    sample_count = 0;
    for (l_cnt = 0; l_cnt < 4; l_cnt++)
{
        sum[l_cnt] = 0;
    }
     int stateButton = digitalRead(pinButton); //read the state of the button
     int stateButton1 = digitalRead(voltage[0]); //read the state of the button
     int stateButton2 = digitalRead(phase2); //read the state of the button
     if(stateButton == 1 && stateButton1 ==1 &&  stateButton2 == 1 ) { //if is pressed+ all phases present then.
   
     digitalWrite(LED, HIGH); //write 1 or HIGH to led pin
     digitalWrite(ON, HIGH);
     digitalWrite(OFF, LOW);
     } else { //if not pressed
     digitalWrite(LED, LOW);  //write 0 or low to led pin
     digitalWrite(ON, LOW);
      digitalWrite(OFF, HIGH);
     delay(10000);
     } if(voltage[0] < voltage[2]) digitalWrite(RELAY, HIGH);
     else { digitalWrite(RELAY,LOW);
     delay(20);
   
     }
    }