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Token number display system using microcontroller

Bank token number display project is build using ATmega8 Microcontroller and ULN2003 for driving large LED display, PCB layout, Circuit diagram are self explanatory. It is capable to display three digits, its simple project using microcontroller. Token issue systems are ideal for banks, airports, public dealing offices, hospitals,doctor’s clinics, restaurants and other such places where people have to wait ...

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Introduction to AVR Microcontroller Pulse Width Modulation (PWM)

PWM is used in many industrial mostly for controlling the motor speed. The PWM is used because it’s the most efficient method comparing to the analog one. That’s why most of the modern microcontrollers today have this features build in. How does this PWM works will be described on the following circuits: On the figure 1A the motor is controlled by applying continues current through transistor base lead and ...

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The LED Chasing Effect Project using Atmel AVR Microcontroller

One of the interesting projects for most of the embedded beginners enthusiasts or hobbyists is to build the LED chasing effect. In this project we are going to use both the Arduino IDE and Atmel AVR Studio to program the AVR ATMega168 microcontroller, therefore you could learn to use these well known Integrated Development Environment (IDE) to program the project. The LED Chasing Project To complete the pro ...

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Analog to Digital Converter of ATmega32 with LED Display

Microcontrollers are capable of detecting binary signals: is the button pressed or not? These are digital signals. When a microcontroller is powered from five volt, it understands zero volts (0V) as a binary 0 and five volts (5V) as a binary 1. But the real world is not so simple and likes to use shades of gray. What if the signal is 2.72V? Is that a zero or a one? We often need to measure signals that vary ...

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4X4 Keypad Interfacing with ATmega32 and LED Display

Keypads are parts of HMI or Human Machine Interface and play really important role in a small embedded system where human interaction or human input is needed. Matrix keypads are well known for their simple architecture and ease of interfacing. In this project, we will learn How to interface a 4X4 keypad with AVR ATmega32 microcontroller. Here, we will display the value of the pressed key in a 1X8 LED array ...

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4X4 Keypad based Password with ATmega16 and LED Display

Security is a prime concern in our day-today life. Everyone wants to be as much secured as possible. Keypad based password is one of the many method and the most common and easy one to provide security to any system. In this project, we will learn How to design a password protected system using a 4X4 keypad with AVR ATmega16 microcontroller. Here, the user will enter a 4 digit numeric password to gain acces ...

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LM35 Temperature Sensor Interfacing with ATmega32 and LED Display

LM35 series is a low cost and precision Integrated Circuit Temperature Sensor whose output voltage is proportional to Centigrade temperature scale. Thus LM35 has an advantage over other temperature sensors calibrated in Kelvin as the users don’t require subtraction of large constant voltage to obtain the required Centigrade temperature. It doesn’t requires any external calibration. It is produced by Nationa ...

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