In this post, we will make arduino and processing based GUI person counter. For person counter, we are using infrared sensor (IR). It's output is digital and is fed to pin number 7 of arduino.
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.
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.
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.
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.
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.
Password protected system using DTMF
Hello guys, this project is about password protected system using DTMF module. By using a predefined number we can make output either high or low by using the three digit code.
The codes can be changed in the program.
In this post, we are going to make dtmf module and interface it using arduino.
My prototype
Theory of DTMF:
Full form of dtmmf is dual tone multi frequency. The DTMF telephone keypad is laid out in a 4×4 matrix of push buttons in which each row represents the low frequency component and each column represents the high frequency component of the DTMF signal. Pressing a key sends a combination of the row and column frequencies. For example, the key 1 produces a superimposition of tones of 697 and 1209 hertz (Hz). Initial pushbutton designs employed levers, so that each button activated two contacts. The tones are decoded by the switching center to determine the keys pressed by the user.
In this circuit, pot of 10k is used for controlling the volume. Gain in this circuit is 20. You can also also power supply of 5 volt. This is the basic circuit having gain equals to 20 and there is no bass in this circuit. You can give audio input from mobile/laptop.
IR remote based home automation using arduino:
With new advancement in technology, we are going towards automation. In this post we will learn how to control your home appliances using IR remote. Since bluetooth and wifi are expensive as compared to IR remote.
List of components:
1. Arduino Uno
2. TSOP 1738/1838
3. 6 V/7 A relay * 2
4. ULN 2003
Line follower robot without using microcontroller:
In order to make line follower robot, we have to use L293D, which is motor driver ic used to control the motors. IR sensor which gives its input to the motor driver ic i.e. L293D. 7805 is there to convert 9 volts to 5 volts. We can implement this circuit on breadboard as well.
Line Follower Robot
For circuit diagram, refer to Fritzing sketch given below:
Fritzing sketch
The motors are geared one, as we know that geared motor has more torque than normal motor. That's why we are using geared dc motor. In this figure, we are using two 9-volt battery, one is for motor driver and ir sensor while other one is dedicated for motor.
Pin diagram of L293D
L293D is also known as h-bridge. In L293D, we have to two channels by which we can control two motors. 600mA output current per channel.
You can make your own arduino board provided you need a programmer to upload programme on the board. We can make USBasp programmer from the previous post.
Arduino had lots of varities e.g. Arduino NG, Arduino Uno, Arduino Mega , etc.
We are going to use Arduino NG which uses Atmega8/Atmega168 or we can also use Arduino UNO which uses Atmega328.
We are using Arduino IDE 1.6.0 and we have to click on Tools>Programmer>USBasp
Then we have to click on Tools>Boards>Arduino NG or older.
