As the new driving recorder gradually enters the market, its role is not only to record the road conditions of the camera, it will also take photos, video sharing, navigation, can connect with WeChat, QQ and even detect the air quality inside the car. If such a function can meet the needs of the owner, it is possible to develop another blue sea in this Red Sea.
This article refers to the address: http://
The vehicle network OBD module collects the record start travel time, end time, total fuel consumption (idle fuel consumption, running fuel consumption), single travel mileage, idle fuel consumption, driving fuel consumption, current fuel cost, current average speed, current time. Data such as maximum speed, maximum speed and other driving behaviors, commonly used vehicle speed, speed, water temperature, voltage, OBD fault code information, the data will be transmitted to the background through GPRS, the partner will open the Chinese OBD fault code library high-quality APP application API for free. Port, you can query more than 12,000 car OBD fault code information in real time.
Recorder application: We will collect the data collected by OBD according to the speed and speed of the vehicle, in case of collision, lock the data and send the car data and video data to the background in time. Combined with the big data medical rescue system, timely analyze the reasonable rescue plan and reduce mortality rate.
Figure 1 OBD16 module circuit
Directly acting recording instruments are greatly limited in terms of bandwidth and sensitivity. To overcome these shortcomings, many recording instruments are equipped with amplifiers. Figure 2 shows the principle line and amplitude-frequency characteristics of a recording instrument incorporating a compensated feedback amplifier. The damper coil wound around the drive coil produces an electromotive force proportional to the speed of motion, which is fed back to the amplifier to produce suitable damping to give the active portion good amplitude-frequency characteristics. The RC network on the feedback loop is used to further increase the operating frequency range.
Figure 2 Compensation Feedback Amplifier
Figure 3 shows a circuit diagram of an LM-12 type recorder made using this principle. It consists of three stages: preamplifier voltage amplification, post current current conversion, and header in the dashed box. The voltage amplification stage consists of an integrated operational amplifier that converts the measured signal Uin, amplified (or attenuated) into U1. The current conversion stage is a DC amplifier with deep current negative feedback that is used to convert voltage U1 to output current Io.
In order to achieve high input impedance, the voltage amplification stage is amplified in phase. The output of the voltage amplification stage is connected to a current conversion amplifier. RP2 in this stage is a zero-setting potentiometer. The potentiometer can be used to adjust the zero position of the pen tip; RPt is a gain potentiometer for adjusting the sensitivity of the amplifier to obtain an appropriate amplitude. Record the waveform.
S1 is an input switch. When it is in "on", the input signal is turned on. When it is turned to the "off" side, the non-inverting terminal of the op amp is connected to the common terminal through F3 to avoid external interference. S21 is a rate switch. When it is in the “mV†position, the measurement range is 20~1000mV. When it is in the “0.1V†position, the measured signal is attenuated by a voltage divider composed of R1 (1.98MΩ) and Rg (20kΩ). After the multiple, the amplification is performed again. At this time, the measurement range is 2 to 100 V. 53 is a range switch for changing the magnitude of the feedback resistance Ft, so that the closed loop gain is changed step by step within the range of 50 to 1. When the switch S22 is in the "calibration", the U1 output of the operational amplifier is directly fed back to the inverting terminal of the operational amplifier. At this time, the calibration signal is sent to the operational amplifier, and the recorder records the "ten 1V" signal, and the recorded signal to be measured is recorded with it. By comparing, the measured size can be obtained.
Figure 3 LM-12 recorder circuit diagram
The output of the current conversion amplifier is fed to the meter working coil through switch S4 to drive the stylus movement. The damper coil wound with the working coil feeds back the angular velocity. RP4 is a damping potentiometer that can be adjusted to provide proper damping of the meter. RP3, C, and R7 are frequency equalization networks used to achieve a flat response from the amplifier head system in the 0 to 70 Hz range.
The recording part of the LM-12 consists of a magnetoelectric head, a circular arc straightening mechanism, a paper feed mechanism and a marking mechanism. The recording paper is moved forward by the synchronous motor, the gear shifting mechanism, and the paper feed mechanism.
Solar Patio Lights,Solar Led Street Light,Solar Powered Flood Lights,Solar Powered Security Lights
jiangmen jieken lighting appliance co.,ltd , https://www.jekenlighting.com