AT89C2051 Night Light Saver
#AT89C2051
#night light
#timer
#CD4093
#Schmitt trigger
#clock emulation
#energy saver
#low cost
#no battery backup
#no EMI
Description: The Saver V5.0 operates a simple clock emulation program that controls a night light, turning it on and off at preset times, specifically from 19:00 to 22:00 every day. The design is characterized by its low cost, ease of installation, absence of battery backup, and minimal electromagnetic interference (EMI). The circuit utilizes the AT89C2051 microcontroller, which is driven by an external oscillator generated by a Schmitt trigger gate (CD4093) at approximately 680 kHz. The reference frequency is derived from the 50 Hz mains line. Time setting is accomplished by pressing the time set button once at 18:00. In the event of a mains failure, a functioning LED will blink at a high rate. Due to the lack of battery backup, the button must be pressed again to reset the system. The output is capable of driving a load, such as a 25W incandescent lamp.
The Saver V5.0 circuit is designed for efficient control of a night light based on a simple time schedule. It employs the AT89C2051 microcontroller, which serves as the core processing unit. The microcontroller's clock signal is generated by a Schmitt trigger inverter (CD4093), which ensures a stable and reliable oscillation at approximately 680 kHz, suitable for the timing functions required in this application.
The system's timekeeping is synchronized with the 50 Hz mains frequency, providing a reference that enhances accuracy. Users can set the operational time for the night light by pressing a designated button at 18:00. This simple user interface allows for straightforward programming of the light's on and off cycle, ensuring that the light is operational during the evening hours.
In the event of a mains power failure, the system incorporates a visual indicator in the form of a blinking LED. This feature alerts users to the power interruption, prompting them to reset the system by pressing the time set button again. The absence of battery backup means that the system relies entirely on the mains power for operation, which simplifies the design and reduces costs but requires user intervention in case of a power outage.
The output stage of the circuit is designed to drive a 25W incandescent lamp, which is a common choice for night lighting applications. The circuit's design ensures that it can handle the necessary load without overheating or experiencing performance issues. Overall, the Saver V5.0 represents a practical solution for automated night lighting, combining low cost and ease of use with essential functionality.The Saver V5. 0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated by Schmitt trigger gate CD4093, ~680kHz. Reference frequency was derived from 50Hz main lin e. Time setting only allows at 18:00 by pressing time set button once. If main line has failed, functioning LED will blink at high rate. Since there is no battery backup, thus repressing the button is then needed. The output is capable of driving say, a 25W incandescent lamp.
The Saver V5.0 circuit is designed for efficient control of a night light based on a simple time schedule. It employs the AT89C2051 microcontroller, which serves as the core processing unit. The microcontroller's clock signal is generated by a Schmitt trigger inverter (CD4093), which ensures a stable and reliable oscillation at approximately 680 kHz, suitable for the timing functions required in this application.
The system's timekeeping is synchronized with the 50 Hz mains frequency, providing a reference that enhances accuracy. Users can set the operational time for the night light by pressing a designated button at 18:00. This simple user interface allows for straightforward programming of the light's on and off cycle, ensuring that the light is operational during the evening hours.
In the event of a mains power failure, the system incorporates a visual indicator in the form of a blinking LED. This feature alerts users to the power interruption, prompting them to reset the system by pressing the time set button again. The absence of battery backup means that the system relies entirely on the mains power for operation, which simplifies the design and reduces costs but requires user intervention in case of a power outage.
The output stage of the circuit is designed to drive a 25W incandescent lamp, which is a common choice for night lighting applications. The circuit's design ensures that it can handle the necessary load without overheating or experiencing performance issues. Overall, the Saver V5.0 represents a practical solution for automated night lighting, combining low cost and ease of use with essential functionality.The Saver V5. 0 runs simple clock emulation program, turns a night light on and off with preset time, say 19:00 to 22:00 everyday. The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated by Schmitt trigger gate CD4093, ~680kHz. Reference frequency was derived from 50Hz main lin e. Time setting only allows at 18:00 by pressing time set button once. If main line has failed, functioning LED will blink at high rate. Since there is no battery backup, thus repressing the button is then needed. The output is capable of driving say, a 25W incandescent lamp.
Jogging Timers
This circuit was developed in response to requests from visitors of this website for a timer that can emit a beep after one, two, three minutes, and so on, for jogging purposes. As illustrated in the circuit diagram, SW1 is...
a regularly repeating interval timer
This circuit features an adjustable output timer capable of re-triggering at specified intervals. The output duration can range from a fraction of a second to over half an hour, and it can be configured to repeat at regular intervals spanning...
Design on the basis of AT89C2051 intelligent automobile anticollision alarm equipment
With the fast-paced nature of modern life, the frequency of traffic accidents is also increasing. To enhance vehicle safety, this text presents a mechanically controlled car anti-collision alarm system designed as a single unit. This device integrates real-time control and...
Appliance Cutoff Timer
Suitable for cutting off an appliance or other AC load, this timer will cut the AC power after a period determined by R1/C3, as shown, for about 40 minutes. K1 is a relay that should handle about 10 A. S1A...
Relay Timer with ATmega8
Timers are widely used in industrial and domestic applications for automating tasks. Microcontrollers can be used to design versatile and accurate timers.
Timers play a crucial role in both industrial and domestic environments by facilitating the automation of various tasks. The...
Long Delay Timer Circuit
This timer is designed primarily to turn off a portable radio after a set duration. This feature allows users to relax on the beach or in a hammock, confident that the device will automatically power down after a specified period,...
Schmitt Trigger Circuit
This Schmitt trigger circuit is emitter coupled and provides a simple comparator action. The 2N3069 JFET places very little loading on the measured input. Schmitt trigger, emitter coupled, simple comparator, 2N3565, distinct hysteresis loop.
The described circuit utilizes an emitter-coupled Schmitt...
The Time Delay Circuit
The duration for which the circuit remains active is determined by the time required for the stored electrical current to leak back into the circuit, which keeps the transistor and the entire circuit energized. A resistor is present that limits...
LED Countdown Timer with AT89C2051
A simple count-down LED timer that counts in minutes and seconds. Three buttons below the LED provide control of the unit, allowing you set the desired countdown time in minutes and seconds and a start/stop button. Completion of the countdown...