In general hospital ambulances, the traditional flashing lights have long relied on blue mechanical rotary signal lights. However, this article introduces an innovative approach by replacing these mechanical systems with high-efficiency blue LEDs. The design aims to create a more realistic and dynamic visual effect, enhancing visibility and safety during emergency operations. To further improve the visual impact, high-quality mirrors can be incorporated into the system.
The proposed system utilizes 16 ultra-bright blue LEDs arranged in two segments and four groups, forming a circular layout. Instead of a rotating mechanical light, the circuit employs a sequential illumination pattern that simulates a rotating effect. This method not only reduces mechanical wear but also increases energy efficiency and longevity.
The principle circuit is illustrated in the diagram. It connects the +12V terminal to the ambulance battery’s positive pole, while the GND is connected to a grounding wire. The A terminal is linked to the door switch. When the ambulance door is closed, the door switch (S2) closes via a linkage mechanism. If the power switch (S1) is then turned on, the flip-flop circuits N1 and N2 generate a high-level output, which activates the oscillator N38, putting the system into operation.
The oscillation frequency is controlled by the time constants formed by C2, R3, and RP. By adjusting the variable resistor RP, the user can regulate the speed of the LED rotation. The oscillating signal is sent to the clock input (CP) of the octal counter IC2 (CD4022), which sequentially outputs high pulses at Y0 to Y3. These pulses trigger the transistors VT1 to VT4 in sequence, causing the LEDs to illuminate one after another in a rotating fashion.
Each group of LEDs is divided into two segments, and both segments are lit simultaneously. The lighting sequence follows a specific pattern:
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 N1 and N2 flip-flops. This causes the N23 pin to go low, shutting down the oscillator N38 and stopping the LED rotation. At this point, the power switch S1 should be turned off, and the 12V power supply disconnected. For a more realistic effect, high-quality mirrors can be added to reflect and enhance the blue light, making it more noticeable from a distance.
This design offers a modern, reliable, and visually effective alternative to traditional mechanical signal lights, suitable for use in emergency vehicles where clarity and performance are critical.
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