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Simple Motorcycle LED Turn Signal Indicator Circuit

A simple motorbike LED turn signal indicator circuit adds a flashing with chasing effects on the LEDs in place of the conventional incandescent bulbs in the turn signal system.

In this circuit IC 555 is integrated circuit acts as an oscillator, generating the flashing signal.

Circuit Working:

Simple Motorcycle LED Turn Signal Indicator Circuit Diagram

Parts List:

CategoryDescriptionQuantityWattage
Resistors390Ω51/4 watt
10k51/4 watt
4.7k31/4 watt
CapacitorsElectrolytic 100μF 25V2
SemiconductorsIC 5551
TransistorsBC5475
LEDsOrange 5mm 20mA10
Diodes1N41482

This circuit is a basic motorbike LED turn signal indicator circuit.

To generate a flashing signal an astable multivibrator, such as an IC 555 integrated circuit is utilized.

Below is how the circuit works:

The motorcycles battery or another 12V source provides electricity to the circuit.

The circuits essential component is the 555 IC1, since it is set up as an astable multivibrator it may provide a continuous rectangular output pulse without the need for an outside trigger signal.

The frequency of the oscillation is controlled by the capacitor C2 and timing resistor R12.

The first time the power is switched on, C2 begins to charge via R12.

The 555 IC output pin 3 drops low Logic 0 as the voltage across C1 increases.

When C2 reaches its maximum charge, the timers output changes to high logic 1.

As a result, C2 discharges via R12 lowering the voltage once again.

The timers output flips back to low when the voltage across C2 reaches a certain point.

The output pins consistent frequency of high and low switches as a result of this cycle, which keeps repeating sets the turn signals flashing rate.

The current flowing to the LED turn signals is managed by transistors T1 to T5, which function as electronic switches.

Transistors T1 to T5 are arranged to conduct in a sequential manner enabling current to move to through all the ten LEDs creating a running LED turn signal effects.

The purpose of diodes D1 and D2 is to shield the transistors from sudden voltage spikes.

R1 to R13 resistors control the voltage levels at various places in the circuit and limit the flow of current in different areas.

Formulas:

Using the IC 555 we can develop an astable multivibrator circuit for a motorbike LED turn signal indication by constructing a circuit that alternates at a set frequency between two states (for left and right signals).

The circuits and the necessary formula is as follows:

Formula for Frequency (f):

The settings of the resistor R and capacitor C define the oscillation frequency (f) in the astable mode of the IC 555.

f = 1.44​ / (R1 + 2R2) *C

where,

Duty Cycle:

The output waveforms duty cycle D which expresses the proportion of the outputs high ON to low OFF times, is as follows:

D = R2​ / R1 + 2R2

To have your motorbike turn signal indicator circuit flashing at the right pace, adjust these numbers as needed.

How to Build:

To build a Simple Motorcycle LED Turn Signal Indicator Circuit follow the below mentioned steps for connections:

Safety Measures:

Conclusion

An alternative to conventional incandescent turn signals that is brighter, more resilient and requires less electricity is a simple motorcycle LED turn signal indicator circuit.

While providing a number of benefits a successful and secure update requires careful consideration of compatibility, installation and the most likely requirement for an LED compatible flasher relay.

References:

Turn signal for my motorcycle

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