555 timer icLCD-LED Display

LED Indicator Light Schematic Circuit Diagram

The objective of this project is to develop an LED-based indicator. This LED indicator light serves as a budget-friendly electronic project, suitable for replacing conventional indicators in bicycles and vehicles.

Circuit Components

The required components of the LED indicator light circuit include the following.

Circuit Connections

An astable 555 timer is utilized to generate clock pulses in this setup. The timer’s trigger pin is linked to the threshold pin. To represent the pulse count, a BCD counter IC 7490 is employed, with LEDs connected to the output of the counter IC, indicating the on/off state of the LEDs.

Circuit Diagram and Its Operation

The 555 timers produce pulses that feed into the clock input of the counter. Depending on the pulse count, the counter generates a robust signal at each of its output pins. Whenever an output pin receives a high signal, an LED connected to it illuminates. As the countdown advances, the illuminated light appears to move from right to left.

When the battery voltage drops to 10 volts, the voltage at the inverting terminal becomes lower than that at the noninverting terminal. As a result, the output of the OPAMP increases, causing LED2 to emit a GREEN light, indicating that the battery needs recharging.

Some LEDs emit infrared light, which is not visible to the naked eye. However, these LEDs find utility in applications such as remote controls and burglar alarms.

Abbreviated as LED, a light-emitting diode is a semiconductor that produces illumination when subjected to an electrical charge. LEDs are typically available in green, amber, or red colors, but they come in various other shades as they have gained popularity in case lighting.

Indicator lights are employed to visually convey the operational status (on, off, or fault) of a device to observers from the outside through a small light source.

The cost of replacing an indicator bulb by a professional usually falls around $40. The bulb itself is typically inexpensive, ranging from $10 to $30, and the installation process typically takes between 15 to 30 minutes.


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