This basic automatic emergency light will automatically get actuates when the mains power goes off. The circuit is economical and uses a few parts and it is likewise a better and longer life.
An Automatic LED Emergency Light circuit intends to turn ON when there is no satisfactory lighting or if the power supply is cut-off. Prior fluorescent lights were employed to make such circuits. But the utilization of LEDs has been demonstrated to give sufficient lighting for a more extended period before draining the battery.
We have made a basic emergency light circuit that doesn’t require any extraordinary equipment; even a multimeter to amass and utilize. Any person who can do good quality soldering must be able to manufacture this circuit effectively.
Hardware Components
The following components are required to make an Automatic Emergency Light Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | Transistor | 2N4401 | 2 |
| 2. | Optocoupler | PC817 | 1 |
| 3. | Diode | 1N4007 | 1 |
| 4. | LEDs | – | 4 |
| 5. | AAA Battery | 1.5V | 3 |
| 6. | AC adapter | 220V | 1 |
| 7. | Resistor | 1K, 200K, 120R, 56R | 1, 1, 1, 4 |
PC817 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of PC817
Automatic Emergency Light Circuit
Working Explanation
The circuit given here is not using any rechargeable battery. It is utilizing three 1.5V AAA batteries. For lighter, you can likewise build the number of LEDs and associate each LED with its 56 ohms current constraining resistor the same as we have associated the four LEDs. You can add at least 16 LEDs to the circuit. For best execution fit the circuit with batteries in an appropriate fenced-in area.
Note: Many points of this circuit are at AC mains voltage. It could give you a deadly shock. If you don’t know a lot about working with AC line voltages don’t endeavor to develop this circuit.
Applications and Uses
- Automatic Emergency Light Circuit could be utilized in places where the light gets on consequently as the power goes off.
- Automatic Emergency Light Circuit with battery charger is useful as a backup power supply
- It could use in study rooms and working environments so as to maintain a strategic distance from unexpected power failures.
- It could also use as an emergency light in homes and different spots.
