In recent years, unfortunate incidents of cycling or running at night have occurred from time to time, often because during the turn or high-speed driving, the driver of the car is limited by the nighttime field of view and cannot be avoided. Most of the traditional nightwear is passive, which is made of reflective materials. It is widely used by people working under dark conditions. Because it uses the principle of reflection, it can only be reflected by the light, and it is produced by different lights. The reflective effect is different, which greatly limits the use of the luminous suit and the use of the crowd. Some active LED lights have a small luminous surface and weak intensity, which can not play a good warning role.
This article designed a night-time suit with LED warning function, which can self-illuminate at night. This night service can protect the rider or runner who needs to travel at night.
1. Overall design of the system planThe overall block diagram of the system is shown in Figure 1. The main control core of STM32 is the LED drive circuit, LED bulb, control button, power detection circuit and low-power sound and light alarm circuit. The main controller completes the control of the whole system, scans the change of the control button, and outputs a corresponding PWM control signal to the LED driving circuit; the battery power detecting circuit inputs a detection signal of the battery voltage change to the main controller, and the main controller detects the signal. After that, it is judged whether the current battery power is normal. If it is detected that the battery power is too low, the control signal is output, the sound and light alarm circuit is turned on, and the LED light is turned off.
Figure 1 System overall design block diagram
2, LED layout and drive circuit 2.1, LED layoutThe designed LED can be switched between white, blue and red according to the user's preference. The LED light strip used is SMD3528/60LED/5V soft light strip to ensure the wearing comfort. The overall layout of the LED is shown in Figure 2. Three areas, such as left steering, right steering, and constant lighting, are designed to meet the warning requirements of the rider when turning and going straight. LED lights are placed on the fluorescent cloth to increase the reflective area and reduce the use of LED strips to reduce weight.
Figure 2 LED distribution diagram
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