Bicycle back Safety Lights
#LED
#flashing
#bicycle safety
#low voltage
#CMos 555
#battery operated
#visibility
#joggers
#walkers
#back light
Description: This circuit is designed to provide a clearly visible light using 13 high-efficiency flashing LEDs arranged in a pseudo-rotating order. Due to its low voltage, low battery drain operation, and compact 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 configured as an astable multivibrator, generating a 50% duty-cycle square wave at an approximate frequency of 4 Hz. At a 3V supply, the 555 output (pin 3) performs better in sinking current than sourcing, hence LEDs D1-D6 are connected to the positive supply. To achieve an alternating flashing operation, a second 555 IC is included, functioning as a trigger and inverter while driving LEDs D7-D12. LED D13 is permanently illuminated. The LEDs are arranged in two series displays, with a center LED that is always on. This configuration, along with the alternating flashing of the two series of LEDs, creates a pseudo-rotating effect.
The circuit utilizes a CMOS 555 timer IC configured in astable mode to generate a square wave signal, which is critical for controlling the flashing of the LEDs. The frequency of approximately 4 Hz ensures that the LEDs flash at a rate that is visually appealing and easily noticeable. The first set of LEDs (D1-D6) is connected to the output of the first 555 timer, which sinks current effectively at the specified low voltage supply. This is essential for battery-powered applications, as it minimizes power consumption while maximizing brightness.
The second 555 timer IC serves a dual purpose: it acts as a trigger for the LEDs in the second series (D7-D12) and functions as an inverter, ensuring that the flashing of the LEDs is out of phase with the first set. This creates the illusion of movement, as the LEDs appear to rotate in a pseudo manner. The arrangement of the LEDs in two series, with the center LED (D13) permanently on, enhances the visual effect and provides a steady reference point in the display.
The circuit design is compact, making it ideal for installation on bicycles or for use in portable lighting applications for joggers and walkers. The choice of high-efficiency LEDs ensures that the device operates effectively at low power, extending the life of the battery. Overall, this circuit represents an innovative approach to creating a dynamic lighting effect that is both functional and visually engaging.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 approx. 4Hz frequency. At 3V supply, 555 output (pin 3) sinking current operation is far better than sourcing, then LED D1-D6 are connected to positive supply. In order to obtain an alternate flashing operation, a second 555 IC is provided, acting as a trigger plus inverter and driving LEDs D7-D12.
D13 is permanently on. The LEDs are arranged in a two series display as shown below, with a center LED permanently on. This arrangement and the alternate flashing of the two series of LEDs provide a pseudo-rotating appearance.
The circuit utilizes a CMOS 555 timer IC configured in astable mode to generate a square wave signal, which is critical for controlling the flashing of the LEDs. The frequency of approximately 4 Hz ensures that the LEDs flash at a rate that is visually appealing and easily noticeable. The first set of LEDs (D1-D6) is connected to the output of the first 555 timer, which sinks current effectively at the specified low voltage supply. This is essential for battery-powered applications, as it minimizes power consumption while maximizing brightness.
The second 555 timer IC serves a dual purpose: it acts as a trigger for the LEDs in the second series (D7-D12) and functions as an inverter, ensuring that the flashing of the LEDs is out of phase with the first set. This creates the illusion of movement, as the LEDs appear to rotate in a pseudo manner. The arrangement of the LEDs in two series, with the center LED (D13) permanently on, enhances the visual effect and provides a steady reference point in the display.
The circuit design is compact, making it ideal for installation on bicycles or for use in portable lighting applications for joggers and walkers. The choice of high-efficiency LEDs ensures that the device operates effectively at low power, extending the life of the battery. Overall, this circuit represents an innovative approach to creating a dynamic lighting effect that is both functional and visually engaging.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 approx. 4Hz frequency. At 3V supply, 555 output (pin 3) sinking current operation is far better than sourcing, then LED D1-D6 are connected to positive supply. In order to obtain an alternate flashing operation, a second 555 IC is provided, acting as a trigger plus inverter and driving LEDs D7-D12.
D13 is permanently on. The LEDs are arranged in a two series display as shown below, with a center LED permanently on. This arrangement and the alternate flashing of the two series of LEDs provide a pseudo-rotating appearance.
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