Guessing questions in electronic design competition

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Should the abstracts of college students' electronic design competitions be translated into English?

Reward score: 0-9 days before the problem ends, 1 hour.

Hello, friends, I am a student who is about to participate in the national electronic design competition for college students. Do you want to translate the abstract into English when writing a paper? Thank you!

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Simple intelligent electric vehicle

Reward score: 0- 10 days, 2 hours before the problem ends.

The title of the electronic design competition

Who knows which sensor is better?

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Model and application example of small angle sensor

Reward points: 100- 14 days, 3 hours before the problem ends.

I participated in the electronic design competition this year and announced that there are angle sensors in the component list. I don't know what they are for. Please don't be stingy with your friends. I'll wait for the answer online.

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Who has information about the angle sensor? The more detailed, the better. thank you

Reward points: 10- 14 days 8 hours ago.

This year's electronic design competition has used angle sensors. I hope you prawns can help me introduce the angle sensor. Thank you ~ ~

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Control group of 2007 National Electronic Design Competition for College Students 20898 193

Reward points: 20- 14 days +0 1 hour before the end of the problem.

Control group, convenient for discussion. Please indicate: 07- Control when applying for membership.

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How to use resistance wire

Reward score: 50- 14 days. The question ended 22 hours ago.

Is it better to use manganese copper or constantan? What's the difference

Please be more specific

Manganese copper is generally used to manufacture traditional bridges, standard resistors, voltage dividers, precision instruments and attenuators.

Manganese copper is fragile and has a small temperature coefficient.

Kangtong is generally used for compensation lines of thermocouples and fuses in glass melting pipes.

Kangtong is soft and has a certain and stable temperature coefficient of resistance.

Type impromptu from memory, or ask the old-timers of Gansu Tianshui Instrument Factory to explain correctly.

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Q&A Game of 2007 Electronic Contest

Reward score: 0- 14 days 17 hours before the end of the question.

2007 National Electronic Design Competition for College Students

List of basic instruments and main components

Accurate temperature measurement,

Given a precise pow supply,

Using digital circuit to generate voltage with specified precision;

Using a precision resistor to generate a specified precision voltage, the examiner will identify whether the generated voltage is accurate and score according to the accuracy;

Precision regulated power supply,

Dynamic measurement of slope;

Generating a voltage signal, a digital signal and a frequency signal corresponding to the tilt;

Photoelectricity tracks the movement of ground metal wires,

Accurate low temperature changes are converted into frequency changes,

To the innovation lab on the second floor,

Go to the Innovation Lab on the 7th floor.

If I were an examiner, I would ask the electric car to stop at the specified angle on the changing slope accurately and not let me use the computer, because it is too easy.

If I am an examiner, I need the waveform parameters of the function generator, and the time domain and frequency domain correspond to a measured physical quantity, so I need a fully analog circuit.

If I were an examiner, I would brake when the length of the resistance wire released by the electric car reached the specified value. Digital technology is not allowed.

If I were an examiner, I would ask electric cars not to carry power batteries.

If I were an examiner, I would ask the electric car to release the wires or resistance wires to the ground, and then put them away and wind them neatly.

Angle sensor generally refers to static, and it is impossible to require inertial instruments in short-term competitions. In that case, unless the teacher goes into battle, the students will be stumped by a big piece.

The standard method of angle sensor is to weigh the hammer on the rotary encoder, which is also produced in China and applied to the position measurement of elevator car. This is a precise photoelectric coding device. Traditionally, it is gray code output. Now you can buy second-hand products in the imported electromechanical disassembly market, which is quite cheap. The disadvantage is that there is no instruction manual. Therefore, it is good to use public funds to purchase domestic products, and you can immediately request decoding methods and decoding software.

Foreign precision can reach 4096 absolute codes per week.

The angle sensor also has non-absolute coding, which is an incremental output. If there is no dedicated channel for the initial pulse, you need to use your own initial positioning sensor, generally using infrared standard products, the disadvantage is low accuracy.

If the infrared position switch is used as the angle sensor array before the test on September 4, it is estimated that the measuring range of 45 degrees should be guaranteed, at least 30 degrees, and you can get extra points if you do it yourself.

I introduced the imported standard tilt sensor to an academician before. The analog sensor costs 3000 yuan and the digital sensor costs 6000 yuan, which is three-dimensional.

You can temporarily search for goods, inertial instruments and industrial equipment.

Another simple method is to add a hammer to the potentiometer. The problem is that the friction torque is small, that is, imported military potentiometers and industrial potentiometers, with or without rotation angle restrictions. Generally a 80 yuan to 300 yuan, urgent orders too late. Go to various markets to find the spot.

Then the potentiometer is calibrated, and the analog quantity is coded by single chip microcomputer, and it is ready.

The potentiometer made in China is too tight, which requires a large pendulum radius and a large weight.

1 yuan The common potentiometer is made of carbon film, and the angular resistance accuracy is about 5%, the winding angular resistance accuracy is about 1%, and the military and industrial angular resistance accuracy is about 0. 1%.

The angle sensor without angle limit can accumulate mileage through gear transmission. The topic may be to record the mileage and inclination at a specified time and make a maneuvering steering action.

The tricky topic is to ask for action at a specified speed and acceleration and within a specified mileage.

We should seize the time to calibrate the mileage and inclination angle of the car after the final assembly; On the basis of mileage calibration and time calibration, speed calibration and acceleration calibration are carried out; Then you should be able to turn around and turn at the specified speed within the specified mileage, stop temporarily, and then move.

laid-off workers

It is illegal to enter the innovation lab.

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How to detect coal flow in coal mines at present? How to design a scheme to monitor coal production?

Reward score: 20- 14 days 12 hours before the problem ends.

Mainly aimed at the problems of falsely reporting the output of coal mines and tampering with the general monitoring output.

On-line measurement on conveyor belt is traditionally measured by high-energy rays, such as radioactive substances and radiation detection instruments used in cement production.

It should be a dynamic weighing instrument now.