Time Delay can be is defined as the controlled phase between the operations of two events. A Time Delay relay is a blend of a control circuit and an electromechanical output relay. The control circuit can be built with solid state components as well as timing circuits which controls the operation of the relay & timing range. Time delay relays have a wide range of timing choices from less than one second to many days. There are a lot of choices of timing varies from DIP switches, calibrated external knobs, recessed potentiometer, or thumbwheel switches. A circuit is intended to activate a load after a certain delay. A time delay is a relay that waits on for a certain amount of time once activated. This is made up of a simple variable timer circuit which controls the actual relay. The time is modifiable from 0 to about 200 seconds but can be amplified by increasing the time constant of the mono-stable created out of 555 timers.
Time Delay Based Relay Operated Load
The time delay based relay operated load can be built with LED, push buttons, resistor, capacitor, 555 timers, 1N4007, BC547, battery, and relay.
An embedded system can be defined as; it is a combination of software and hardware which as one form a module of a larger machine. The best example of an embedded system is a microprocessor that controls an automobile engine. An embedded system is intended to run on its own without human interference and may be necessary to react to actions in real time.
LED is a semiconductor device which is made out of Si (silicon). When the flow of current supplies through the LED it produces photons as a byproduct. Standard light bulbs generate light by heating a metal filament until its white-hot LEDs present several advantages over usual light sources with lower energy utilization, improved strength, longer lifetime, lesser size and quicker switching.
- The BC547 transistor is a general purpose, NPN epitaxial silicon transistor, and it is available in small plastic packages. The applications of this transistor mainly involve in general-purpose switching, 100 mA NPN general-purpose transistors, and amplification BC847/BC547 series 45 V.
- When the base terminal is high, then the current flow starts flowing through base and emitter terminals and after that only flow of current will pass from collector terminal to emitter terminal.
The 555 Timer IC is a chip, used to implement a range of timer and multivibrator applications. The unique name was the SE555 (metal can)/NE555 (plastic DIP) and the part was described as “The IC Time Machine”. Depending on the manufacturer, the standard 555 package includes over 20 transistors, 2 diodes and 15 resistors on a silicon chip installed in an 8-pin mini dual-in-line package (DIP-8).
Pin Diagram of 555
- The 555 timer IC is a simple 8 pin DIL package IC.
- It can be used as a monostable, an astable, source or sink 100mA, use supply voltages of 5v to 15v, disrupt the power supply – use a decoupling capacitor!
- An electrical battery is a combination of one or more electrochemical cells, used to convert stored chemical energy into electrical energy.
- The battery has become a common power source for many household, robotics, and industrial applications.
- Larger batteries provide standby power for telephone exchanges or computer data centers
- It is an electromagnetic switch, used to control the electrical devices
- Copper core magnetic flux plays the main role here
The project is intended to design a time delay based switch to manage any load. A 555 IC timer is used in a monostable mode to make a relay to turn ON/OFF a load for the set time period.
A time delay based relay that stays on for a certain period of time once activated. This circuit is made up of a simple adjustable timer circuit which controls the actual relay.
The adjustability of time can be done from 0 to few seconds but can be amplified by increasing the stable time of the monostable 555-timer. The ability of current handling of the load is restricted by the type of relay used. The proposed system uses a lamp as a load.
Thus, this is all about the time delay based relay operated load. We hope that you have got a better understanding of this concept. Furthermore, any doubts regarding this topic or to implement any electronics projects please give your valuable suggestions by commenting in the comment section below. Here is a question for you, what is the function of time delay based relay?