An optocoupler is an electric-optical-electrical conversion device that transmits electrical signals by means of light. It consists of two parts: a light source and a light receiver. The light source and the light receiver are assembled in the same sealed casing and separated from each other by a transparent insulator. The pin of the light source is the input end, and the pin of the light receiver is the output end. The common light source is a light emitting diode, and the light receiver is a photodiode, a phototransistor, and the like.
When driving a motorcycle, it is very inconvenient because the vehicle itself and the surrounding environment are relatively noisy and often cannot hear the ringing tone of the mobile phone. In order to solve this problem, the author designed a car voice type mobile phone caller, which can be conveniently installed inside the motorcycle, and can be automatically operated without turning on the power switch or other operations, only when the motorcycle is running, if When the driver's mobile phone rings, it will make a loud voice prompt, telling the driver: "Someone calls your phone, please answer!"
Circuit principle: The mobile phone call indicator is a novel mobile phone decoration. Now it is sold in the communication equipment store or mobile phone store. The price is around 20 yuan. It intercepts the specific frequency response when the mobile phone rings. After the sound, the high-brightness LED emits a striking flash. When the indicator flashes, it does not target a specific mobile phone. Its effective range is about 1 meter, which means that when the mobile phone rings within 1 meter of the mobile phone call indicator. The indicator will flash. The indicator on the market is relatively small. It is about the size of a button with a small spiral antenna. The two leads of the ultra-high brightness LED are connected to the optocoupler. At the input of PT621, the photocoupler is turned on repeatedly when the incoming call indicator flashes. Since the light-emitting diode conduction voltage inside the photocoupler is lower than that of the ultra-high-brightness light-emitting diode, the ultra-high-brightness light-emitting diode does not emit light at this time. CX01 is a voice recording and playback module produced by Zhejiang Yile Electronic Equipment Co., Ltd. The price is very low, only about 10 yuan, the recording and playback time is 10 seconds, the information is not lost after power off, the working current is about 25 mA, the quiescent current is 1 micro. The trigger mode is pulse triggering, that is, the module is triggered to work only when the trigger terminal changes from high level to low level, and the module automatically switches to the low power waiting state after the module finishes playing. The CX01 module has been equipped with a recording button, a playback button, a microphone, and a recording indicator. When you use it, you only need to connect a 4.5~6.5 volt DC power supply and an 8~16 ohm speaker to record and play the sound. After connecting the power supply and the speaker, press and hold the recording button. At this time, the recording indicator lights up and enters at 20 cm from the microphone: “Someone calls your mobile phone, please answer it!†Just click the playback button module after the recording is completed. Play a voice prompt “Someone hits your phone, please answer!â€. The volume of the prompt sound directly sent by the module is relatively low, and it may not be heard when installed on a motorcycle, so the audio power amplifier composed of LM386 is added. Connect one of the two speaker outputs of the module to the potentiometer W through capacitor C1. Note that the two speaker outputs of the module cannot be directly grounded, otherwise the module will be permanently damaged! The volume of the beep can be changed by adjusting the potentiometer. The speaker can use an 8 ohm 1 watt elliptical speaker on the TV.
The power supply of the device can be connected to the ignition switch of the motorcycle. It can obtain 12 volt DC voltage when the motorcycle is running, and is regulated and filtered by the LM7806 to obtain 6 volt working power. When installing, pay attention to the antenna of the mobile phone call indicator. It should not be close to the metal parts of the motorcycle. It is best to be as close as possible to your mobile phone to ensure reliable operation. When someone hits your mobile phone while driving, you will repeatedly use the voice to remind you to answer the phone. When you turn off the motorcycle and answer the call, the device will automatically stop the reminder. Try to be as close as possible to your phone to ensure reliable work. When someone hits your mobile phone while driving, you will repeatedly use the voice to remind you to answer the phone. When you turn off the motorcycle and answer the call, the device will automatically stop the reminder. |
