Clock Display Atmel Atmega8535 circuit

Security is a primary concern in daily life, and an access control system is a crucial component of a security framework. The microcontroller-based digital lock described here is an access control system that permits only authorized individuals to enter a...

8x8 dotmatrix scrolling led display

This project involves a scrolling LED display composed of 64 LEDs arranged in a matrix configuration. The anodes of the LEDs are driven by a driver IC, UDN2981, while the cathodes are controlled using the ULN2803. An Atmega8515 microcontroller is...

5x7 LED display schematic

Your 5x7 display is my favourite toy; the tunes and graphics in the elevator display always impress my mates! Since building the display I developed my own 400 dot matrix using a pic and the SN74154 4bit binary to 1...

Microcontroller Based Telephone Remote Control Circuit

This device enables remote control of various appliances (up to eight with suitable add-on expansion boards) such as lights, water heaters, air conditioning, plant watering systems, alarms, etc., via a relay. It allows users to perform actions such as watering...

Preprogrammed single-chip microcontroller

Twenty-five musical keys and 25 LEDs are provided to denote F to F" with half notes in between. Memory can store a played tune. There are ten preprogrammed tunes (each has an average of 55 notes) masked in the chip....

Robot Motor Control Schematic

The schematic for controlling the motors is divided into three main sections, each serving a distinct function. The primary components featured in the schematic include the PIC 18F252 microcontroller, the SN754410 motor driver, and 2N2222 transistors. At the top of...

clap sensor construction

The clap sensor is a straightforward circuit that consists of a PC microphone, a microcontroller, and an output. The circuit design features the ATtiny84 microcontroller, chosen for familiarity with the AVR architecture and accessibility to necessary tools. The ATtiny84 is...

home security system

The fundamental design of this project employs an Atmel AT89S8252-24PC Microcontroller, which features 2KB of EEPROM for runtime data storage. An ADC0838CCN analog-to-digital converter will be utilized to process up to eight inputs from sensor devices, including passive infrared sensors...

Digital DC Millivoltmeter

The DC millivoltmeter features a three-and-a-half digit display, offering high accuracy, performance, stability, and user-friendliness. Its measurement range extends from 0 to 1.999 mV, with a measurement accuracy of 1 mV. The DC millivoltmeter is designed to provide precise voltage measurements...