In modern ambulances, blue mechanical rotary lights are commonly used for emergency signaling. However, this paper introduces an advanced electronic system that replaces the traditional rotating mechanism with a more efficient LED-based solution. The design incorporates 16 ultra-bright blue LEDs arranged in two segments and four groups, forming a circular pattern. Instead of a physical rotating light, the system uses a sequential illumination approach, where each segment is lit one after another to create a smooth rotational effect.
The circuit diagram illustrates the core components of the system. The +12V terminal is connected to the ambulance battery, while the GND is linked to a grounding wire. The A terminal is connected to the door switch. When the ambulance door is closed, the door switch (S2) closes, triggering the system. If the power switch (S1) is turned on, the flip-flop circuit involving N1 and N2 generates a high-level output, which activates the oscillator (N38). The oscillation frequency is controlled by the time constants of C2, R3, and RP, allowing users to adjust the rotation speed of the signal light.
The oscillating signal is then sent to the CP input of the CD4022 octal counter IC2, which controls the decoding output. As a result, Y0 to Y3 generate positive pulses in sequence, causing VT1 to VT4 to turn on one by one. This triggers the LEDs (LED1 to LED16) to light up in a specific order. The LEDs are divided into two segments, with both segments lighting simultaneously. The illumination sequence follows two alternating patterns:
1. LED1 & 2 → LED5 & 6 → LED9 & 10 → LED13 & 14 → LED1 & 2...
2. LED3 & 4 → LED7 & 8 → LED11 & 12 → LED15 & 16 → LED3 & 4...
Once the ambulance stops and the door is opened, the door switch (S2) opens again, resetting the system. This causes N1 and N2 to return to their initial state, turning off the N23 pin and deactivating the oscillator. As a result, the LED rotation ceases, and the system powers down when S1 is turned off. The 12V power supply is also disconnected at this point.
To enhance the visual effect, high-quality mirrors can be added to reflect the light more effectively, creating a more realistic and eye-catching rotating blue aura. This electronic system not only improves efficiency but also offers greater flexibility and control over the emergency lighting system.
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