Bicycle Back Safety Light Circuit

Description: This circuit has been designed to provide a clearly visible light, formed by 13 high-efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation, and small size, the device is suitable for mounting on bicycles as a backlight or for use by joggers and walkers. IC1 is a CMOS version of the 555 IC wired as an astable multivibrator, generating a 50% duty-cycle square wave at approximately 4Hz frequency.

The circuit utilizes a total of 13 high-efficiency LEDs, which are strategically arranged to create an eye-catching visual effect. The pseudo-rotating light pattern enhances visibility, making it an excellent safety feature for cyclists and pedestrians during low-light conditions. The design is optimized for low power consumption, allowing it to operate effectively on battery power without significant drain, thus extending the operational life of the device.

The core of the circuit is the CMOS 555 timer IC, which functions as an astable multivibrator. In this configuration, the IC generates a continuous square wave output at a frequency of around 4Hz. The duty cycle is set to 50%, ensuring that the LEDs are illuminated for equal intervals of time, which contributes to the uniform flashing effect. The frequency can be adjusted by changing the values of the resistors and capacitors connected to the timer, providing flexibility in the flashing rate to suit different visibility requirements.

The LEDs are connected in a manner that creates the illusion of rotation as they flash sequentially. This is achieved through a combination of resistors and transistors that control the timing and sequencing of the LEDs. The circuit design ensures that the current flowing through each LED is within safe limits, preventing damage and ensuring longevity.

In terms of power supply, the circuit is designed to operate at low voltage, making it compatible with standard battery types commonly used in portable devices. The compact design allows for easy mounting on bicycles or integration into wearable devices for joggers and walkers. Overall, this circuit represents an effective solution for enhancing visibility and safety in various outdoor activities.This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles as a back light, or to put on by jogger/walkers.

IC1 is a CMos version of the 555 IC wired as an astable multivibrator generating a 50% duty-cycle square wave at about 4Hz frequency..