MQ-2 gas sensor
Arduino Uno R3
Breadboard
red LED
green LED
Piezo-Buzzer
3 x 220Ω Resistor

The Sketch

Upload the following sketch to your android board. Feel free to adjust the threshold values or improve the sketch to your liking.

/****************************************************************************

Project Name : MQ-02 Based Smoke Detector

Author: Mike Martins

Vesion: 1

Date Created: May 6,2016

*****************************************************************************/

int redLed = 12;
int greenLed = 11;
int buzzer = 10;
int smokeA0 = A5;
// Your threshold value
int sensorThres = 400;

void setup() {
pinMode(redLed, OUTPUT);
pinMode(greenLed, OUTPUT);
pinMode(buzzer, OUTPUT);
pinMode(smokeA0, INPUT);
Serial.begin(9600);
}

void loop() {
int analogSensor = analogRead(smokeA0);

Serial.print(“Pin A0: “);
Serial.println(analogSensor);
// Checks if it has reached the threshold value
if (analogSensor > sensorThres)
{
digitalWrite(redLed, HIGH);
digitalWrite(greenLed, LOW);
tone(buzzer, 1000, 200);
}
else
{
digitalWrite(redLed, LOW);
digitalWrite(greenLed, HIGH);
noTone(buzzer);
}
delay(100);
}

https://www.arduino.cc/

http://textpinoy.com/electronic-projects/mq-2-gas-sensor-arduino-smoke-detector/

// Initialize Pinsint analogPin = 0;   // = 0 soll = A0 sein weil analog Eingangint chargePin = 13;int dischargePin = 11; //speeds up discharging process, not necessary though// Initialize Resistorint resistorValue = 560;// Initialize Timerunsigned long startTime;unsigned long elapsedTime;// Initialize Capacitance Variablesfloat microFarads;                float nanoFarads;void setup(){  pinMode(chargePin, OUTPUT);       digitalWrite(chargePin, LOW);    Serial.begin(9600); // Necessary to print data to serial monitor over USB}void loop(){  digitalWrite(chargePin, HIGH); // Begins charging the capacitor  startTime = millis(); // Begins the timer    while(analogRead(analogPin) < 648)  {           // Does nothing until capacitor reaches 63.2% of total voltage  }  elapsedTime= millis() - startTime; // Determines how much time it took to charge capacitor  microFarads = ((float)elapsedTime / resistorValue) * 1000;  Serial.print(elapsedTime);         Serial.print(" mS    ");           if (microFarads > 1) // Determines if units should be micro or nano and prints accordingly  {    Serial.print((long)microFarads);           Serial.println(" microFarads");           }  else  {    nanoFarads = microFarads * 1000.0;          Serial.print((long)nanoFarads);             Serial.println(" nanoFarads");              delay(500);   }  digitalWrite(chargePin, LOW); // Stops charging capacitor  pinMode(dischargePin, OUTPUT);   digitalWrite(dischargePin, LOW); // Allows capacitor to discharge      while(analogRead(analogPin) > 0)  {    // Do nothing until capacitor is discharged        }  pinMode(dischargePin, INPUT); // Prevents capacitor from discharging  }

34) Home > Arduino Projects > Arduino universal remote
TSOP1738 IR-Empfänger (pin-11)  -  3xLED (pin-2, 4, 6) - Serial

#include <IRremote.h>int RECV_PIN = 11;IRrecv irrecv(RECV_PIN);decode_results results;void setup(){  Serial.begin(9600);  irrecv.enableIRIn(); // Start the receiver}void loop() {  if (irrecv.decode(&results)) {    Serial.println(results.value, HEX);    irrecv.resume(); // Receive the next value  }}

#include <IRremote.h> int RECV_PIN = 11; // int output1 = 2;int output2 = 4;int output3 = 6;int itsONled[] = {0,0,0,0};#define code1  0xFF807F // #define code2  0xFFA05F // #define code3  0xFF906F //  IRrecv irrecv(RECV_PIN); decode_results results; void setup(){  Serial.begin(9600);   //   irrecv.enableIRIn();  //   pinMode(output1, OUTPUT);  pinMode(output2, OUTPUT);  pinMode(output3, OUTPUT);} void loop() {  if (irrecv.decode(&results)) {    unsigned int value = results.value;    switch(value) {       case code1:         if(itsONled[1] == 1) {        //             digitalWrite(output1, LOW);   //             itsONled[1] = 0;           //          } else {                      //              digitalWrite(output1, HIGH); //              itsONled[1] = 1;          //          }          break;        case code2:         if(itsONled[2] == 1) {            digitalWrite(output2, LOW);            itsONled[2] = 0;         } else {             digitalWrite(output2, HIGH);             itsONled[2] = 1;         }          break;       case code3:         if(itsONled[3] == 1) {            digitalWrite(output3, LOW);            itsONled[3] = 0;         } else {             digitalWrite(output3, HIGH);             itsONled[3] = 1;         }          break;              }    Serial.println(value); // you can comment this line    irrecv.resume(); // Receive the next value  }}

35) Home > Arduino Projects > Drive LCD display with arduino

LCD-Display 16x2  HD44780-Treiber  (pin-2. 3, 4, 5  pin-11, 12)

Drive LCD-Anzeige mit ARDUINO UNO R3

Die meisten 16 × 2 LCD folgen den gleichen Pin-Konfigurationen wie angegeben, oder Sie können das Datenblatt Ihres LCD verweisen, um die Pin-Verbindungen wissen.

LCD - Pin Schließen Sie das Gerät an
1 (VSS)   Arduino-GND
2 (VDD)   Arduino  +5V
3 (Kontrast) Widerstand oder Potentiometer auf GND Arduino Pin *
4 RS       Arduino pin-12
5 R / W    Arduino pin-11
6 Aktivieren Sie Arduino Pin 10
7 n.c. (keine Verbindung)
8 n.c.
9 n.c.
10 n.c.
11 (Daten 4)           pin-5
12 (Daten 5)          pin-4
13 (Daten 6)           pin-3
14 (Daten 7)           pin-2
15 Backlight + Widerstand auf Arduino Pin 13
16 Hintergrundbeleuchtung GND GND Arduino-Stift

LCD-Display Verdrahtung

Die in arduino IDE erhältliche LiquidCrystal-Bibliothek arbeitet mit allen LCD-Displays, 
die mit dem Hitachi HD44780-Treiber kompatibel sind.


Einfacher Arduino Code

/*  LiquidCrystal Library - Hello World Demonstrates the use a 16x2 LCD display.  The LiquidCrystal library works with all LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the 16-pin interface. This sketch prints "Hello World!" to the LCD and shows the time.  The circuit: * 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 * LCD VSS pin to ground * LCD VCC pin to 5V * 10K resistor: * ends to +5V and ground * wiper to LCD VO pin (pin 3) Library originally added 18 Apr 2008 by David A. Mellis library modified 5 Jul 2009 by Limor Fried (http://www.ladyada.net) example added 9 Jul 2009 by Tom Igoe modified 22 Nov 2010 by Tom Igoe This example code is in the public domain. http://www.arduino.cc/en/Tutorial/LiquidCrystal */// include the library code:#include <LiquidCrystal.h>// initialize the library with the numbers of the interface pinsLiquidCrystal lcd(12, 11, 5, 4, 3, 2);void setup() {  // set up the LCD's number of columns and rows:  lcd.begin(16, 2);  // Print a message to the LCD.  lcd.print("hello, world!");}void loop() {  // set the cursor to column 0, line 1  // (note: line 1 is the second row, since counting begins with 0):  lcd.setCursor(0, 1);  // print the number of seconds since reset:  lcd.print(millis() / 1000);}

http://www.theorycircuit.com/drive-lcd-display-with-arduino-2/




36) Home > Arduino Projects > Arduino Serial Command LED

LED 5mm rot  Seriel-EIN/AUS  (pin-12)  -  Serial


Arduino Serielle Befehls-LED

In diesem Projekt verwendeten wir arduino seriellen Monitor, um die LED an / aus zu befehlen und kennen den Status der LED-Bedingung. 
Mit einfachen Messschalter-Gehäuse-Codes und alphanumerischen Tasten können wir digitale Pins von arduino.

Hier haben wir arduino programmiert, um die Ein- / Aus-LED einzuschalten, die in den digitalen pin-12 geschaltet ist. 
Dann liest die arduino-Sketch den Status des digitalen pin-12 und den seriellen Druckwert entweder als "LED ist nun aktiviert oder deaktiviert". 
Sie können dieses Konzept verwenden, um jedes Ausgabegerät zu steuern, das mit arduino digital pin verbunden ist.

Arduino-Code / Sketch


#define LED 12         char rxChar= 0;         void setup() {  Serial.begin(9600);      pinMode(LED, OUTPUT);     Serial.println("--- Command list: ---");  Serial.println("! -> Print this HELP");    Serial.println("o -> LED On  \"activate\"");  Serial.println("f -> LED Off \"deactivate\"");  Serial.println("s -> LED     \"status\"");   Serial.flush();             }void loop(){    if (Serial.available() >0) {               rxChar = Serial.read();                 Serial.flush();                         switch (rxChar) {        case 'o':    case 'O':                             if (digitalRead(LED) == LOW) {                   digitalWrite(LED,HIGH);                 Serial.println("LED turned On");  }        else Serial.println("LED already On!");        break;    case 'f':    case 'F':                             if (digitalRead(LED) == HIGH) {                  digitalWrite(LED,LOW);                  Serial.println("LED turned Off");  }        else Serial.println("LED already Off!");        break;            case 's':    case 'S':                             if (digitalRead(LED) == HIGH)                   Serial.println("LED status: On");        else Serial.println("LED status: Off");        break;            case '!':                                   Serial.println("--- Command list: ---");  Serial.println("! -> Print this HELP");    Serial.println("o -> LED On  \"activate\"");  Serial.println("f -> LED Off \"deactivate\"");  Serial.println("s -> LED     \"status\"");                        break;            default:                                 Serial.print("'");      Serial.print((char)rxChar);      Serial.println("' is not a command!");    }  }}

http://www.theorycircuit.com/arduino-serial-command-led/





37) Home > Arduino Projects > Analog Input to servo motor using Arduino
HS-425BB RC Modellbau Servo  (pin-9)  -  10k Poti (pin-A2) 

Analogeingang zum Modellbau-Servo mit ARDUINO UNO R3

Die Servomotoren werden in vielen Anwendungen eingesetzt, dieser Motor arbeitet mit Eingangsimpuls und Drehung abhängig von der Eingangsimpulsdauer. 

Hier imitieren die Rotation des variablen Widerstands durch die Drehung des Servomotors (ein Servo ist ein Drehbetätiger)

In diesem Projekt variabler Widerstand, der mit dem analogen Eingangsstift  A0 und dem Servomotorimpulsstift verbunden ist, der mit dem digitalen Stift D9 verbunden ist, kann dieser Stift pwm Puls geben.

Der Bereich des variablen Widerstands wird in einen digitalen Wert umgewandelt, und der entsprechende Pulsbreitenmodulationsimpuls (PWM) wird dem Servomotor über den digitalen Stift D9 zugeführt. 
Daher können wir Drehung von Servomotor, während wir Widerstand Widerstandswert.Analog-Eingangsservo

Schaltplan

Analog-Eingang-Servo-Schaltung


Die gängigsten Modellbau Servos haben 3 Anschlussleitungen. Wobei diese in der Regel wie folgt belegt sind:

• – GND (Schwarz)
• – PWM (Weiß*, Gelb, Orange)
• – +5V (Rot)

https://www.arduino.cc/en/Reference/Servo
http://playground.arduino.cc/ComponentLib/Servo
http://www.makerblog.at/2014/06/arduino-projekt-servo-ansteuern/
http://funduino.de/nr-12-servo-ansteuern
http://www.mariolukas.de/2011/08/arduino-servo-tutorial/



Analogeingang zum Servo-Arduino Sketch:

#include <Servo.h>
Servo myservo;

int potpin = 0;
int val;


void setup() {
myservo.attach(9);
}


void loop() {
val = analogRead(potpin);
val = map(val, 0, 1023, 0, 180);
myservo.write(val);
delay(15);                                      // 15ms Pause
}


http://www.theorycircuit.com/analog-input-to-servo-motor-using-arduino/




38) Home > Arduino Projects > Analog Input bar graph using Arduino
COM-08635 Mikrofon (pin-A0)  -  5xLED (pin-3, 4, 5, 6, 7)   

Analoge Eingangsleiste mit Arduino

Dieses Projekt bietet visuelle Ausgabe für unterschiedliche Pegel des analogen Eingangs. 
Hier dient das Kondensator Mikrofon (ECM)  als analoger Eingangssensor. 
Sie können jeden beliebigen Analog-Sensor verwenden, den Sie mit der grafischen Balkenanzeige ausgeben möchten. 
Das Mikrofon mit Spannung versorgt von Arduino + 5V Pin und Masse Pin, 
Array von LEDs sind mit digitalen Pins von Arduino verbunden.

http://cdn.sparkfun.com/datasheets/Sensors/Sound/CEM-C9745JAD462P2.54R.pdf

SparkFun Electret Microphone Breakout BOB-12758

https://www.sparkfun.com/products/12758

Schaltplan Analog-bar-graph mit Condenser Microphone

http://www.learningaboutelectronics.com/Articles/Arduino-microphone-circuit.php
http://www.engineersgarage.com/electronic-components/condenser-microphone-pinout
http://www.instructables.com/id/Arduino-Audio-Input/

Microphone Sensor - Sound Detection Module for Arduino

Keyes Microphone Sound Detection Sensor Module for Arduino

https://www.hellasdigital.gr/electronics/sensors/sound-sensors/microphone-sensor-avr-pic-high-sensitivity-sound-detection-module-for-arduino/?sl=en
http://en.comebuy.com/arduino-arduino-sensor-om50423.html

http://electronics.stackexchange.com/questions/16595/how-to-make-a-clean-amplified-microphone-analog-to-digital-conversion

Arduino Sound Detection Sensor: Tutorial and User Manual

http://henrysbench.capnfatz.com/henrys-bench/arduino-sensors-and-input/arduino-sound-detection-sensor-tutorial-and-user-manual/

Microphone Sensor (KY-038)  mit Relays

https://sites.google.com/site/summerfuelrobots/arduino-sensor-tutorials/microphones-with-arduino

How to Build a Sound Detector Circuit

http://www.learningaboutelectronics.com/Articles/Sound-detector-circuit.php

Sound analysis in Arduino

https://bochovj.wordpress.com/2013/06/23/sound-analysis-in-arduino/

LM386 microphone amplifier

https://lowvoltage.wordpress.com/2011/05/15/lm386-mic-amp/


Analoge Eingabe Bargraph arduino Sketch Code:


const int ledCount = 5;
const int ledPins[] = {3, 4, 5, 6, 7};

const int analogPin = A0; // Analog input pin connected to the variable resistor

void setup() {

for(int thisLed = 0; thisLed < ledCount; thisLed++)
{
pinMode(ledPins[thisLed], OUTPUT);
}
}

void loop() {

int sensorReading = analogRead(analogPin);
int ledLevel = map(sensorReading, 0, 1023, 0,ledCount);
for(int thisLed = 0; thisLed < ledCount; thisLed++)
{
if (thisLed < ledLevel)
{
digitalWrite(ledPins[thisLed], HIGH);
}
else
{
digitalWrite(ledPins[thisLed], LOW);
}
}
}


http://www.theorycircuit.com/analog-input-bar-graph-using-arduino/




39) Home > Arduino Projects > LED chaser with buzzer
COM-07950  Piezo-Buzzer (pin-11)  -  3xLED (pin-3, 5, 6) 

Piezo Speaker

LED-Chaser mit Summer

Hier fügen wir Sound mit visueller Ausgabe, ja die LED-Fader-Schaltung oder Chaser-Schaltung mit Summer arbeitet mit Pulsweitenmodulation (PWM) -Ausgang von ARDUINO UNO R3.

Arduino pwm-Ausgänge werden von den digitalen Pin-Nummern 3,5,6 und 11 genommen, wobei jeder Pin mit LED verbunden ist und D11 mit einem Summer verbunden ist. Der Output-Intensitätspegel kann durch Arduino-Skizze variiert werden.

Mini Speaker 12mm  2,048kHz

https://www.sparkfun.com/products/7950

Schaltplan - Betrieb-LED-Summer-Schaltung

Buzzer / piezo speaker  - Arduino Tutorial

http://www.instructables.com/id/How-to-use-a-Buzzer-Arduino-Tutorial/
http://www.instructables.com/id/How-to-use-a-Buzzer-Arduino-Tutorial/
https://www.arduino.cc/en/Reference/Tone
https://www.arduino.cc/en/Tutorial/PlayMelody

https://programmingelectronics.com/an-easy-way-to-make-noise-with-arduino-using-tone/
https://learn.adafruit.com/adafruit-arduino-lesson-10-making-sounds/playing-a-scale

Arduino UNO Tutorial 7 - Piezo Beep
http://www.hobbytronics.co.uk/arduino-tutorial7-piezo-beep

Experiment 11: Using a Piezo Buzzer

https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino---v32/experiment-11-using-a-piezo-buzzer
https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino---v32/experiment-11-using-a-piezo-buzzer

https://diyhacking.com/diy-arduino-keyboard/
https://diyhacking.com/arduino-speaker/


LED-Chaser mit Summer Arduino Sketch / Code: 


/*
* LedBrightness sketch
* controls the brightness of LEDs on analog output ports
*/

const int firstLed = 3; // specify the pin for each of the LEDs
const int secondLed = 5;
const int thirdLed = 6;
const int buzzer = 11;
int brightness = 0;
int increment = 1;

void setup() {
// pins driven by analogWrite do not need to be declared as outputs
}

void loop() {
if(brightness > 255) {
increment = -1; // count down after reaching 255
}

else if(brightness < 1) {
increment = 1; // count up after dropping back down to 0
}

brightness = brightness + increment; // increment (or decrement sign is minus)
// write the brightness value to the LEDs

analogWrite(firstLed, brightness);
analogWrite(secondLed, brightness);
analogWrite(thirdLed, brightness );
analogWrite(buzzer, brightness);
delay(4); // 4ms for each step change means 2.55 secs to fade up or down
}

http://www.theorycircuit.com/led-chaser-with-buzzer/




DIN A4 ausdrucken
*********************************************************
Impressum: Fritz Prenninger, Haidestr. 11A, A-4600 Wels, Ober-Österreich, mailto:[email protected]
ENDE