LCD-LED Display

LED Christmas Lights Circuit

Christmas lights is known as the “Festival of Lights,” and everyone decorates their homes with multicoloured lights purchased from the bazaar. Have you ever considered making your own Christmas lights to use to decorate your home or a sacred space in your home? This simple circuit will guide you through the process of creating your own beautiful lights.

The advantage of these circuits is that you don’t have to worry about the light turning on and off. Lights turn on automatically in the evening and turn off automatically in the morning. As a result, when you leave the house, it will save you money on your electricity bill.

Christmas Lights using LEDs Circuit Diagram:

Christmas Lights

Components used in this Circuit:

  • IC
  • CD4093 – 1
  • Resistor
  • R1 (1K) – 1
  • R2 (10K) – 1
  • R3 (100K)     – 1
  • R4 (100E) – 1
  • VR1 (100K) – 1
  • C1 (22uf) – 1
  • T1 (BC547) – 1
  • LDR – 1
  • D1 (1N4148) – 1
  • LED – 6

Component Description:

LDR – The LDR’s sensitivity is determined by the intensity of light falling on it. LDR resistance reduces with a reduction in light intensity, and vice versa.
LED — A light-emitting diode (LED) is a semiconductor device that emits various colours of light.
Four Schmitt-trigger circuits make up the IC CD4093. Each circuit functions as a NAND gate with Schmitt trigger activation on both inputs. The gate changes at different positions for positive and negative going signals.

LED Christmas Lights Circuit Description:

The CD4093 IC is the heart of this circuit. With two input terminals, it’s a Schmitt trigger quad NAND gate. This circuit includes all LEDs, a sensor, and other components such as transistors, diodes, and resistors.

The IC CD4093 is a 14-pin Dual lnline Package. Pin 1 can be identified by a very little notch on the IC’s one face. On a given chip, it is made up of four self–sufficient NAND gates. Each gate has two input terminals and one output terminal of its own. The voltage range of these ICs is 5V to 15V.

It’s available in a 14-pin Dual Inline Package (DIP). At a voltage of 12V, it will carry an average of 10 MA of current, although it can be reduced by lowering the voltage.

Pins 14 and 7 of the 14-pin package are used to connect the battery or power supply. Pin 7 connects to the negative terminal, and pin 14 connects to the power supply. We dubbed them NI1, NI2, NI3, and NI4 because we already knew they were made up of four gates. Pins 1 and 2 of the first gate, NI1, are used for input, whereas pin 3 is used for output. The circuit schematic below shows you how to do so. When all of the input terminals are in the high state, the output shifts to the low state; otherwise, we get a high output. This is something that can be used in the truth table below.

4093 IC Pin Diagram and Truth Table

The entire circuit is divided into two sections: one for the sensor section and another for the LED flesher section. The circuit’s light sensor section is made up of two transistors, T1 and T2, as well as LDR. During the day, the light resistance of the LDR is low, causing the transistor T1 to transmit, causing the T2 transistor voltage to drop to a low level and remain in the cut off state. As a result, the LED linked to the output point will not light up throughout the day. When there is no light at night, LDR achieves a high resistance, which causes T1 conduction to halt and T2 conduction to begin. Because of its LED attaced.

At the moment, the LED flashing circuit is built around the CD4093 IC, which is in oscillator mode. The oscillation component is made with the help of the resistor R2 and the capacitor C1. The fleshing effect is produced by the diode D1 in combination with the resistor R3 because it causes the capacitor C1 to change rapidly. As a result, when the capacitor C1 is charged to half of the power supply, the output from pin 3 IC1 drops and the capacitor C1 discharges. Pin3 is connected to pins 5 and 6, causing the capacitor C1 to charge again, as illustrated in the circuit diagram. As a result, the above cycle continues until power is delivered to the circuit.

You can change the rate of the LED flashing by changing the value of the resistor R2 and the capacitor C1. If you want to make the flashing light bigger, lower the value of the C2 capacitor, and if you want to lower the rate, lower the value of the capacitor. A variable resistor is all that is required to keep the LDR’s sensitivity in the circuit.


Related Articles

Leave a Reply

Your email address will not be published.

Back to top button