introduction
With the continuous development of science and technology, new technologies, new materials, new processes and new devices have emerged, people have conducted in-depth research and development on infrared optics in order to achieve automation, saving manpower, improving efficiency, increasing equipment functions, ensuring safety, protecting the environment, saving resources and energy. The infrared sensor of the human eye plays a particularly important role. The television set with infrared remote control was introduced in 1972. Especially since 1990, the near-infrared sensor has been successfully applied in various fields. The near-infrared sensor is applied with 940nm light wave. The carrier is implemented by transmitting and receiving.
The car reversing anti-collision voice prompter studied in this paper uses the reflective infrared transmitting and receiving module TX05D as the object recognition sensor. When the car reversing behind the vehicle or the obstacles appear, such as when the car enters the library and the wall is parked in a narrow occasion, the car turns around, etc., the voice The recording and reproducing component can send out the person behind the vehicle body, and there is an obstacle warning message behind the vehicle body to remind the driver to pay attention to the <the rear view mirror has a line of sight dead angle, the driver can not observe it), thereby improving the safety performance of the car. The voice prompting system uses the voice recording and playback component, and can be repeatedly recorded and played. 100,000 sounds, stored voice can be saved for 100 years after power off, good sound quality, low cost, simple wiring, great convenience for users. Power supply is powered by 12 V battery and 6 V voltage regulator on the car. Also convenient for the device is characterized by:
Strong anti-interference ability, stable and reliable work, voice prompt, measuring distance of 1.2 m, suitable for installation on the car.
1 module structure and working principle
1.1 Reflective Near Infrared Sensor TX05D
The shape and lead of the TX05D are shown in Figure 1. It is an all-in-one structure. It is very convenient to use. All the circuit soldering is installed on the side of a plastic box with a mounting bracket D of 46 mm × 32 mm × 17 mm × Indicator light and sensitivity adjustment hole, red LED is used to indicate the working state of the near-infrared sensor, normally extinguished, when there is a reflector, the illumination sensitivity adjustment hole is used to adjust the reflection detection distance, the clockwise adjustment distance is increased, and the counterclockwise adjustment distance is reduced. The small TX05D uses a 1.5 m double-core shielded cable as the output lead, where the red line is the positive pole of the power supply and the white line is the output end. The shielded wire < copper net D is connected to the negative pole of the power supply within the effective detection range of the near-infrared sensor. Some people and objects exist, the voltage on the white line of the output is high. If there is no reflector, the output is low. In actual application, if the length of the lead is not enough, it can be lengthened as needed.
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TX05D Operating voltage is 5~12 V Limit voltage 15 V Operating current 5~20 mA Maximum 30 mA Detection distance is 1. 2 m0TX05D Working principle, when the TX05D is powered on, the infrared transmitting tube inside the module emits 38 kH modulation forward. When an infrared light signal enters (or has an object present) within the effective detection range, a part of the infrared light signal is reflected back to the infrared receiving tube, and then converted by the internal circuit into an electrical signal of the same frequency and then amplified, demodulated, shaped. After the comparison process, a high level signal is output at the output end. Because the TX05D uses modulation technology and anti-interference devices with imported compensation, the anti-interference problem is solved to some extent.
1. 2 voice recording and playback component IDD1110/ 1420
ISD series voice recording and playback components are based on the most advanced US ISD company single-chip voice processing large-scale integrated circuit ISD series chip as the core memory, noise-eliminating microphone preamplifier and automatic gain control circuit, suitable for voice dedicated filtering The circuit has a clock oscillation circuit with extremely high temperature stability and all voice processing circuits. It achieves full patch miniaturization, sound quality, and ruggedness.
The ISD series of voice recording and playback components can be used in a variety of voice messages, voice alarms and voice prompts. The component can save information for a long time in the case of power disconnection and can change the content of the input. The component is compact and the field of use is very wide and extremely convenient. The operating voltage of the component is 4. 5~ 6. 5 V The typical value of the quiescent current is 0. 5MA working current is 25 mA. Recording time is 10~20 S. Permanent storage information can be recorded and played back 100,000 times. Storage can be reserved for 100 years. It is easy to use. No programming and development system can be changed. Recording and playback content can be changed by ordinary electret microphone. 8~16Ω speaker playback.
2 car reversing anti-collision voice prompter wiring diagram
The wiring diagram is shown in Figure 2. It consists of a near-infrared sensor, a voice recording and playback component, and a power supply. The IC1 in Figure 2 can be selected with the 7806 integrated regulator IC2 using the TX05D near-infrared sensor (Tianjin Texin Electronics Factory). IC3 uses the ISD1420 voice recording and playback component (recording time is 20 S). The KS uses the HRM2H relay. The rest of the components are supplied by the manufacturer and do not need to be purchased. In practical applications, the TX05D is mounted in the middle of the rear of the car and its launch, the receiving tube is oriented backwards and the -12 V lead is connected before the backup light. In this way, when the car is reversing, the lighting circuit of the reversing lamp is automatically energized.
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3 operation process
3. 1 recording
Turning on the power circuit automatically enters the power saving preparation state. Press and hold the REC record button circuit to enter the recording state. The recording indicator (LED) lights up until the memory is full or the REC button is released. The content can be entered for the driver's master. Please pay attention to the obstacles behind the body after the body.
3. 2 playback
There are several ways to play the sound. Touch the PE (playe) button to enter the playback state until the end. Or press the PL (playl) button to enter the playback state until the playback ends or the playl button is released. You can also use the PL (playl) button to release the L-terminus of the voice recording and playback component. The system uses a cyclic playback method. When there is someone or an object behind the body, IC2 (TX05D) outputs the control signal transistor VT (9013). The relay KS (HRM2H) is closed. One of the switches will connect VCC to the other end of the L-end switch to short-circuit the PL (playl) key to the grounded voice recording and playback component. When the person or object leaves, IC2 outputs a low level VT. The KS release normally open contact and the open sound stops.
4 Conclusion
The car reversing anti-collision voice prompter studied in this paper has been installed on the car and proved to be very effective.
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