Getting Started with NodeMCU

Hello Friends,

Today we will write first program for NodeMCU3 that is led blinking. NodeMCU3 has esp12e and ch340 (USB-TTL) on-board. It can be connected to PC/ Laptop via USB mini(type B) data cable.

Let's get started.

All we need is NodeMCU3 and arduino IDE.
LED and resistor

Step by step installation guide for ch340 USB-UART converter

Hello Friends,

In this tutorial, we will cover how to install ch340 driver for different versions of windows.
CH340 is USB-UART converter and is used for serial communication with PC/ laptop with external device e.g. GSM module, GPS module, arduino pro, etc.

Things required:

CH340 USB-UART

4-Digit Seven Segment TM1637 Display interfacing with arduino

Hello Arduino Lovers,

In this post, I am going to interface 4-digit seven segment display with arduino. It's TM1637 based display and it just requires 4-pins. And it's better than conventional 4-digid SSD since that requires 12 (8+4) output pins. So, it saves our pin. As MCU have limited I/Os it's very useful.

The pins are as follows:

CLK, DIO, VCC and GND. 

It's 2-wire serial communication and it's different from I2C communication.

Generating a delay of 1s using timer in atmega8

Hello Friends,

In this tutorial, we will learn how to generate a delay of 1second using timer0 in atmega8.

We are writing the code in Avr studio 4.

Timer 0 is a 8-bit timer means we can feed any value from 0 (0x00) to 255 (0xff)

Timing Diagram

In this example, we are using prescaler of value8. Prescaler divides the base frequency (provided by crystal or internal rc oscillator).

Machine Cycle = 1/Fosc      (Fosc is 8 MHz)

M.C = 1/8 us or 0.125 us

Delay = (256-x) * 0.125 * Pre scaler  (Pre scaler = 8)

Matlab with Arduino - Part 1

In this post, we are going to install arduino library in matlab.
There are two options available:
Online and Offline support package for matlab. We are using offline method for installation of arduino library.

• Matlab 
• Matlab account (for downloading support package)
• Arduino IDE
• Arduino UNO board

First of all, download the support package zip file from:

Temperature based fan speed control using arduino uno and lm35

In this post, we will make a temperature based fan control using arduino and lm35. LM35 is temperature sensor, whose output is analog (linear). Arduino uno has six channle of adc (A0-A5)

and adc is of 10-bit

Stuff required:

• Arduino UNO
• LM35
• LCD 16*2
• POT 10k
• Motor driver (L293D)
• DC motor

Getting Started with Raspberry Pi

Hello Raspberry Pi Lovers,

In this post, we are going to install NOOBS on raspbeery pi.

Stuff required:

• Raspberry Pi 2/3
• SD card booted with Raspbian OS
• Hook-up wire
• LED with 220ohm resistor
• 5V/ 1A power supply
• Monitor with HDMI port (or you can use HDMI to VGA)

Temperature logger using arduino and thingspeak

Hello Arduino lovers,

In this tutorial, we are making a temperature logger using arduino and thingspeak.
Let's start

Things required:

1. Arduino Uno
2. LM35
3. Sim900 module
4. Internet pack 
5. Thinkspeak account

Interfacing 20*4 LCD with arduino

Hello Friends,

In this tutorial, we are going to interface 20*4 lcd with arduino uno. As the name suggests it has 4 rows and twenty columns. In total, we can show 80 characters. It has blue backlight. It has 16 pins just like 16*2. The pin configuration of 20*4 lcd is similar to that of 16*2 lcd.

Circuit Diagram:

Connection on proteus

How to burn Arduino bootloader to atmega 328

In this post we will learn, how to burn hex file in avr microcontroller using programmer and burner software.

List of components/software:

1. USBasp programmer
2. Target circuit board having microcontroller (mine have atmega328)
3. Avrdudes (Burner software)

Prerequisites:
USBasp driver installed in your system.
If it is not installed, then read instructions about installation from my previous post.
USBasp driver installation

Default fuse byte for atmega328 is: LFUSE = 0X62 and HFUSE = 0XD9. It might vary
This corresponds to internal rc oscillator

LFUSE = 0XFF and HFUSE = 0XDE

This corresponds to external oscillator having frequency 16 MHz

How to update esp8266 firmware

In this post, we are going to upload firmware to ESP8266 (ESP-01) . The firmware can be updated by both arduino as well as usb-ttl module.

ESP-01 is wifi SoC module and it has two GPIO pins i.e. GPIO0 AND GPIO2

For using ESP8266, we can use either AT commands using any terminal software/ esplorer ide (it supports lua programmming and AT commands) or we can use arduino library.

ESP8266 is a 8-pin SoC having two GPIO pins, it requires 3.3 volt and the current consumed by wifi module can't be attained through arduino. Therefore, if we are using arduino we need external 3.3 volt power supply.

Esp8266 wifi module can act as STA as well as AP or both

How to make a simple IR remote tester using TSOP 1838

In this post, we will make a simple IR remote tester. Since infra red rays are invisible to light we can't check it using naked eyes. Therefore, we need some device/ instrument for testing it.

One simple method to check IR remote is by using mobile or digital camera. However, it's not handy.
We will make a simple circuit using TSOP1838

We simply need a Tsop1838, one led (RED 5mm) and a 220 ohm resistor.

Arduino knight rider circuit using led bargraph

In this post, we are going to make knight rider circuit using led bargraph. Led graph, it consists of 10 leds.

Stuff required:

1. Arduino uno
2. LED bargraph
3. 220 ohm resistor
4. connecting wires

Connections:

First of all, make connections as given in the diagram below:

Serial communication with arduino

In this post, we will learn how to serial communicate other device or arduino suing serial communication.

Introduction:

Serial communication (RS-232) is widely used communication for data transfer. It just uses three wires: Rx, Tx and GND

  In serial communication, 8/9 -bit is transferred through a single wire. The data frame is like this:

Start bit > Data fields (8 or 9 bit data) > Stop bit

Arduino based DC Voltmeter (0-50 volts)

In this post, we are going to make digital voltmeter using arduino uno. It's a DC voltmeter and it's range is 0 to 50 volt. As we know, arduino is an open source hardware prototyping platform used worldwide by the hobbyists, educators and students across the globe.
This is a handy voltmeter.

Stuff required:

1. Arduino uno
2. 16*2 lcd
3. 10k pot
4. voltage source

3*3*3 LED cube using arduino uno

Hello Friends,

In this post, we are going to make 3d led cube using arduino. It's 3*3*3 led cube, so require a total of 27 leds. For driving 27 leds we require driver IC like ULN2003.

List of components:

• Arduino uno
• 27 LEDs
• ULN2003
• Perfboard
• 8 220 ohms resistor
• Jumper wires

Line follower robot using Atmega8

In this post, we are going to make a line follower robot using atmega8. Line follower robot is based on tracking a line of particular colour. This is done by infrared (IR) sensor. IR sensor gives us a digital output.

Things required:

1. Atmega8a 
2. L293d (H-bridge ic)
3. DC geared motor
4. chasis
5. 2 Ir sensor
6. Power supply (9 volt battery)

Sending SMS using Atmega16

Hello Friends, in this post we are going to send text sms using atmega16a and Gsm module.

First of all, GSM module is communicated using atmega16a using serial communication.

Stuffs required:

1. Atmega16a 
2. GSM module
3. 12V, 2A dc adapter
4. Sim card having sms pack
5. Some jumper wires

Connection:

Make connection like this. 

Atmega16a                              GSM module

Tx              ========>          Rx

Rx              ========>          Tx

Gnd            ========>          Gnd

Using internal pull-up resistor in arduino

In this post, we will discuss how to use internal pull-up resistor in arduino uno. It's quite simple.

No need of using external pull-up resistor.

What is pull-up resistor?

First, we will find what pull-up resistor is and why it is used.

In many microcontroller, there are no internal pull-up resistor. For example: In 8051, there are four IO ports. Port0 has no internal pull-up resistor. Therefore, it requires external pull-up resistor.

In arduino, the moment we define any pin as input it will attain tri-state. Tri-state is  a state between logic low and logic high. We must remove this condition. Some microcontrollers have built-in internal pull up resistor while some has not.

Interfacing accelerometer with arduino uno

Interfacing accelerometer with arduino uno

Introduction:

In this post, we are going to interface accelerometer with arduino. Accelerometer is a sensor used for detecting motion or change in coordinates. We have three coordinates i.e X, Y and Z axis. It's a five-pin device out of which are for power supply Vcc and Ground. The output of the sensor is in analog.
This sensor required three analog pins. We can provide Vcc and ground directly from the analog pins.
So, we are using five analog pins. Three for axis and two for providing power to the module.

Components required:

1. Arduino Uno
2. ADXL335 (accelerometer)
3. USB type B cable for interfacing with computer.

Connections:

Make connections as follows:

ADXL335                                    Arduino

Vcc                                               A0

X                                                  A1

Y                                                  A2

Z                                                  A3

Gnd                                              A4