Programming of Atmega16 AVR microcontroller.
Interfacing an LCD module to the micro-controller output.
Application of DS1307 as real time clock.
Application of ULN2803 darlinton array and TSOP1738 IR receiver module.
Implementation of the Bridge rectifier circuit for AC to DC conversions.
Use of transistors as signal amplifiers.
The Remote Controlled Real-Time Clock with Device Controller makes use of a TV remote control. Using RC5 coding, a real-time clock chip is set to control five different alarm settings. These settings can also be used to switch on an external device. Up to eight devices can be controlled with this project.
The circuit is based on ATMEL ATmega16 micro controller and Maxim DS1307 real-time clock chip. An LCD module allows for user interface.
It comprises six sections, namely, IR detector remote control sensing and decoding unit, realtime clock, LCD interface, device switching unit, micro controller and power supply unit.
Remote control section. This circuit makes use of a Philips TV remote for device switching.It uses RC5 coding format, which is also known as ‘biphase coding’. In RC5-coded signal, each bit has a uniform duration.
LCD unit. The LCD module (16-character×2-line) is interfaced with the microcontroller. Data pins 7 through 14 of the LCD module are connected to port A (PA0 through PA7) of themicrocontroller. Register-select (RS) pin 4 and enable pin (pin 6) of the LCD are interfaced with PC1 and PC2 of the microcontroller, respectively. R/W pin of the LCD (pin 5) is pulled low permanently and thus is always in writing mode.
Real-time clock. IC DS1307 (IC2) from Maxim (Dallas Semiconductor) is a serial RTC chip with calendar function.In this chip, the clock operates in either 24- or 12-hour format with AM/PM indicator.
Device control. Devices are connected to contacts of the relay and relays are controlled through the outputs of IC4(ULN2803). Whenever an alarm is activated for
a particular setting, the respective device is switched on.
Controller. The controller unit is based on ATmega16 low-power, 8-bit CMOS microcontroller with AVR enhanced RISC architecture.
Power supply. The 230V, 50Hz AC mains power supply is stepped down by transformer X1 to deliver a secondary output of 15V at 500 mA. The transformer output is rectified by a full-wave bridge rectifier BR1,
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