Ashutosh Bhatt

This is the most advance version of “Pick and Place Robot” perhaps and most popular and widely used in recent industries. A person from a remote place can comfortably control the motion of robotic arm without any wire connection. Again there are two systems one at the transmitter side in which a software program written…

In the previous article from this series, we learned how to generate different colors in an RGB LED strip when using Arduino. We covered the basics in terms of how an RGB LED strip works, the types available, and how it can generate various colors.  In this article, we’ll add to that knowledge base. You…

Note: it’s recommended to follow this VHDL tutorial series in order, starting with the first tutorial. In the previous tutorial, VHDL – 18, we designed a T-flip flop using VHDL. For this project, we will: Write a VHDL program a VHDL program to build a 4-bit binary counter Verify the output waveform of the program (the…

Gardening is a favorite pastime for many — and a healthy one. In fact, a recent study found that even a small home garden offers mood-boosting qualities that are similar to those provided by physical exercise.  However, one of the top concerns for many new or novice gardeners is how often to water their plants…

A Wireless Sensor Network (WSN) consists of the following: One central receiver (for monitoring, storage, and controlling) Several wireless sensor nodes The wireless sensor node is a battery-powered or solar-powered circuit that senses any physical quantity (like temperature, pressure, flow, soil moisture, gas, smoke, etc.) and transmits its value to a remote receiver. It consists…

This is the most amazing and commercially viable project in which the web-cam attached to your computer will move in all four direction up-down and left-right with the help of your fingertips. The software written in VC++ will control two different AC motors with the help of computer mouse. The forward and reverse motion of…

The circuit presented here is used to transmit and receive low frequency pulses using IR modulator and demodulator. IR modulator takes low frequency pulses as input. It modulates them on 38 KHz carrier and transmits them through IR LED as 38 KHz IR light. On the demodulator side IR sensor detects (receives) 38 KHz IR light. It demodulates this 38 KHz pulses and recovers transmitted low frequency pulses. One pulse generator is built using IC555 to generate low frequency pulses. IR modulator is also built using IC555 and TSOP1738 IR sensor is used as IR demodulator. 

There are 2 cut off frequencies for band reject filter. First is the upper cut off frequency (f1) -which is the frequency below which all the frequencies are passed. The second is the lower cut off frequency (f2) – which are all the frequencies above this frequency are passed.Similar to band pass filter but the difference is f1 < f2. That means upper cut off frequency is lesser than lower cut off frequency. Two types of band reject filters are 

Note: it’s recommended to follow this VHDL tutorial series in order, starting with the first tutorial. In previous tutorial, VHDL tutorial – 17, we designed a JK flip-flop circuit by using VHDL. For this project, we will: Write a VHDL program to build the T flip-flop circuit Verify the output waveform of the program (the digital…

Note: it’s recommended to follow this VHDL tutorial series in order, starting with the first tutorial. In the previous tutorial – VHDL tutorial 16 – we designed a D flip-flop circuit by using VHDL. For this project, we will: Write a VHDL program to build a JK flip-flop circuit Verify the output waveform of the program…

Note: it’s recommended to follow this VHDL tutorial series in order, starting with the first tutorial. In the previous tutorial, we designed a clocked SR latch circuits using VHDL (which is a very high-speed integrated circuit hardware description language). For this project, we will: Write a VHDL program to build a D flip-flop circuit Verify the…

Arduino has a wide variety of applications. It can find its use in almost all fields. Its applications increase day by day because it’s open source and anyone can create a new set of functions and library to interface any new device with arduino. The given application demonstrates the use of arduino as tone and melody generator. It includes keypad and LCD for user interface. The music notes or melody is generated when the key is pressed and the frequency of generated sound is displayed on LCD. It illustrates keypad and LCD interfacing with Arduino along with tone – melody generation. The complete functionality of this project is due to the software program loaded into internal FLASH memory of arduino board microcontroller ATMega328.

This project is somewhat different than the previous ones we’ve covered on DC motor control. So far, the articles have included insight on controlling a DC motor speed by using: Arduino An 8051 microcontroller An AVR / PIC / ARM microcontroller A remote SMS Bluetooth This time, we’ll be covering DC motor speed control via…

Much like the name suggests, DC motor controllers control the speed and direction of a DC motor. To change the direction of the motor, however, the supply it receives must be reversed. And, to vary the DC motor speed, a pulse-width modulation (PWM) signal or wave must be applied to it.  As the pulse width…

Note: it’s recommended to follow this VHDL tutorial series in order, starting with the first tutorial. In the previous tutorial, VHDL tutorial – 14, we designed two circuits using VHDL: a 1×8 de-multiplexer and a 8×1 multiplexer. In this project, we will, Write a VHDL program to build a clocked SR Latch (flip-flop) circuit Verify the…

The stepper motor has two types based on internal winding and constructions -Unipolar type stepper motor and Bipolar type stepper motor. In bipolar type stepper motor there are two stator coils and their four terminals are provided for interface to rotate motor. So bipolar stepper motors are having 4-wire interface always. While in unipolar stepper motor there are four stator coils. So there are total 8 wires (two for each coil) are provided for interface. There are 3 different interfaces for unipolar stepper motors.We all know that to rotate stepper motor the pulses has to be applied to its coil terminals in proper sequence. If pulses are not applied in proper sequence to its coil terminals, the motor will just vibrate – does not rotate. 

Previously, I have given arduino library for unipolar type stepper motors. It perfectly controls speed, direction, the number of revolutions, motor angle etc all the parameters of unipolar type stepper motors. But it was for only unipolar type stepper motors. As we know the stepper motor may be bipolar type also. But this library cannot control bipolar type stepper motor. So, I have decided to develop another arduino library to control bipolar type stepper motor. Here, I present Bipolar Stepper motor library in Arduino for all bipolar type stepper motors. The library has 9 different functions that can be used to rotate and control motor as per the requirements. The library is designed as per the industrial motion control requirements.

In the previous tutorial VHDL tutorial, we designed 8×3 encoder and 3×8 decoder circuits using VHDL. (If you are not following this VHDL tutorial series one by one, you are requested to go through all previous tutorials of these series before going ahead in this tutorial) In this tutorial, We shall write a VHDL program…

In the previous tutorial VHDL tutorial, we designed an 8-bit parity generator and 8-bit parity checker circuits using VHDL. (If you are not following this VHDL tutorial series one by one, you are requested to go through all previous tutorials of these series before going ahead in this tutorial) In this tutorial, We shall write…

The password based lock for any access control systems is very common now a day. If there is a password lock for any gate/door, then the gate or door only opens when correct password is entered. Mostly in such system numeric keypad is given to enter password. Sequential code lock differs here with normal password lock system. It does not have full numeric keypad with 10 to 12 switches. Instead it has 2 to 3 switches only.