【Chang'an University】Roller distance measuring device + Lin Zehuai

2021 Shaanxi Provincial College Student Electronic Design Competition 7- School League Questions

Roller measuring device ( question D )

1. Task

Design and build a roller measuring device. The roller uses cans with a diameter of 66mm and a height of 110mm . The measurement circuit is installed inside the drum (controlled and displayed at both ends of the drum) or outside the drum (controlled and displayed at the wireless communication terminal). The device can be used to measure parameters such as level, tilt, rolling, and rotation.

2. Requirements

1 . basic requirements

( 1 ) Horizontal measurement. Placing the drum horizontally indicates whether the drum is currently in a horizontal position.

( 2 ) Inclination measurement. Place the drum on a flat surface and lift one end of the drum to show the tilt of the drum

Angle, the required error is ≤1° .

( 3 ) Rolling measurement. Place the roller on a flat surface and push the roller forward to display the rolling distance of the roller (the rolling range is 100~200cm ), and the required error is ≤2cm .

2 . play part

( 1 ) Horizontal rotation measurement. Twist the drum forcefully on a flat surface. After the rotation stops, the number of complete turns will be displayed. The required number of turns error is ≤ 1 turn.

( 2 ) Measuring the height of the inclined plate. Place the roller on the inclined plate (the inclination angle of the inclined plate ranges from 5° to 15° ). The roller rolls down freely from the inclined plate. After rolling out of the inclined plate, grab the roller with your hand and stop it. At this time, the roller measuring device makes a sound. Alarm and display the height of the roller on the inclined plate. The height error is required to be ≤3mm . See Figure 1 for the measurement diagram .

Figure 1 Measurement diagram

    ( 3 ) Others.

3. Description

    ( 1 ) Before starting the measurement, the drum is in a flat state, that is, the opening and bottom of the drum (can) are on the side;

    ( 2 ) In part ( 2 ), the roller rolls down by its own weight without applying artificial thrust.

4. Scoring Criteria