Skip to main content

Getting Started with Switches


Since now we are well acquainted with LED’s let us learn how to control the switching using a push button.
In this tutorial, we will learn how to use a push button.

A push button is used to get control of the circuit.

Components Required
  • Resistors                           2Nos. 330ohms,10k(recommended)
  • Pushbutton                        1No.
  • LED                                  1No. Standard red LED
  • Arduino UNO
  • Breadboard
Follow the video to make the circuit.

After making the circuit it will look like

Now dump the code given below

int d=2; // chose the pin which you have connected to the output of push button
void setup()
{
pinMode(2,INPUT);
pinMode(13,OUTPUT);
}
void loop()
{
d=digitalRead(2);
if(d==0)
{
digitalWrite(13,HIGH);
}
else
{
digitalWrite(13,LOW);
}
}

Now the control is in your hands whenever you will press the button the led will be ON and when you release it, LED will go OFF.

You can alter the control like
                                   
Here when we press the button LED goes ON and when we press it again it goes OFF.

For the code of the above video mail us at contact@sudolearn.com.

I hope you are having fun, try connecting multiple switches with multiple LEDs.

  • A pull-up resistor condition.
When the switch is connected to ground and one end of the resistor is connected to VCC.
  • Pull down resistor condition.
When one end of the switch is connected to Vcc and the resistor is connected to ground.
When you use these conditions while coding just remembers when you press the switch, one will give output as 0 and the other will give output as 1.

Thinking?
Join our hands-on Training Courses.
To know more visit us at http://www.sudolearn.com/

Comments

Popular posts from this blog

IoT - LPG Gas Sensor Logging with NodeMCU and Thingspeak.

In this tutorial, will learn, how to interface MQ-5 Module with Node Mcu(ESP8266).

The Grove - Gas Sensor(MQ5) module is useful for gas leakage detection (in home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol. Due to its high sensitivity and fast response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by using the potentiometer.


Components Required
NodeMcu(ESP8266) MQ-5 LPG SENSOR Module Few male to female connecting wires Breadboard  Follow the image below for circuit connection reference:-
After making the circuit dump the code given below:-

// Karkhana Report
// Analyse the volume of the gas using thingspeak.com
// Hardware: NodeMCU,MQ-5

#include <ESP8266WiFi.h>
String apiKey = "Enter the API key"; // Enter your Write API key from ThingSpeak
const char *ssid = "Enter ssid"; // replace with your wifi ssid and wpa2 key
const char *pass = "Enter password";
const char* server = &qu…

IoT - Humidity and Temperature Logging using NodeMCU and ThingSpeak

Hey Folks,
In this tutorial, we will learn, how to interface DHT 11 with Node Mcu(ESP8266).
The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins needed).




Components Required
NodeMcu(ESP8266) DHT 11 SENSOR Few male to female connecting wires Breadboard
Follow the image below for circuit connection reference.
In this circuit, we have connected the output pin to the D3 pin of the NodeMcu module and NC pin remain disconnected. After making the circuit dump the code given below.
// Karkhana Report
// temperature and humidity data using thingspeak.com
// Hardware: NodeMCU,DHT11
#include <DHT.h> // Including library for dht
#include <ESP8266WiFi.h>
String apiKey = "THINGSPEAK API KEY"; // Enter your Write API key from ThingSpeak
const char *ssid = "ENTER YOUR SSID"; // replace with your wifi ssid a…

Servo Motor Control using ESP8266 and Blynk App

Hey folks, 
In this tutorial we will learn how to interface Servo motor with NodeMcu(ESP8266)module and operate it with the Blynk app. Servos are controlled by sending an electrical pulse of variable width, or pulse width modulation (PWM), through the control wire. There is a minimum pulse, a maximum pulse, and a repetition rate. A servo motor can usually only turn 90° in either direction for a total of 180° movement.
   Follow the image below for circuit connection reference. In this circuit, we have connected the output pin to the D0 pin of the NodeMcu module. If want to control the servo motor manually then connect a 10K potetiometer . The 10K potentiometer will work as a voltage divisor, changing the analog input level on  NodeMCU (A0) from 0 to 3.3V. Internally, the 10 bits ADC (Analog-Digital converter) will generate a digital value (from 0 to 1023), the PotReading, equivalent to the analog voltage input.
After making the circuit dump the code given below.
/*NodeMCU */
#include <ESP…