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Door Chime Privacy Sentry using Attiny12

An ATtiny12 controller as a timer and some switching circuitry turns the doorbell off for 10 hours at the same time each day. The string of resistors across the top of the board are series connected to make a 728 Ohm 2 watt resistor. The slide switch is used to switch the circuit between the test and operate modes and the large round component to the left of the switch is the 0.033 farad capacitor. Download ...

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Attention-Getting Auxiliary Warning Light Flasher/Driver

Overview The circuit shown in Figure 1 is capable of driving an LED array requiring up to several amps with a burst of flashes before coming on until power is removed. It is intended to be used as an auxiliary warning light driver. The initial burst of flashes is meant to enhance visual detection of the indicator coming on. Circuit Description The circuit in which this circuit is intended to be installed is ...

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MMC/SD/SDHC AVR Interface using ATMega8 microcontroller

MMC/SD/SDHC card library This project provides a general purpose library which implements read and write support for MMC, SD and SDHC memory cards. It includes low-level MMC, SD and SDHC read/write routines partition table support a simple FAT16/FAT32 read/write implementation The circuit The circuit which was mainly used during development consists of an Atmel AVR microcontroller with some passive componen ...

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About Atmel and Combination Lock Application using AT90S2313 microcontroller

Microcontroller Microcontroller 's (MCU) is a kind of CPU (CPU) can be seen as. MIB MCUs from slower and less capable of addressing memory, but they are designed for the implementation of real-time control problems both cheaper and easier to use. The major difference between CPU and MCU are required to use external hardware. MCU, almost every time, except for a crystal or oscillator, no external equipment i ...

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AVR Security Keypad Lock using ATtiny2313 microcontroller

The Security Keypad Lock Project is a basic access control system based on ATtiny2313. It can be modified to protect just about anything. The “Code Lock” ability will allow the rightful user to deploy the platform to any property that requires simple password-protection. The “AVR” RISC microcontroller used ensures low costs. Possible applications may include: vehicle protection, electronic safes, powered do ...

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Handy Password Managing System, Lord of the Keys using AVR ATmega168

The Lord of the Keys is password managing system that able to store many usernames and passwords inside a Java Card™ smart card (one of the most secure methods to store confidential information). Whenever a dialog box appears in an application or web browser requesting a username and password, these security features can be found on the externally attached device, which will then automatically complete the ...

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Ultrasonic Security System using Atmega644 microcontroller

This portable security system is built based on Atmega644 microcontroller. It can detect intruders based on their physical presence. The system uses URM37v3.2 ultrasonic sensor which is connected to MCU through rs232 serial communication. To rotate sensor for wide coverage range, the system is equipped with Parallax servomotor. For user interface, there are LCD and keypad wired to PORTC and PORTA of MCU. Ho ...

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