Introduction

Nucleic acid testing has long been a part of our daily life as the epidemic has become normal. So can we make a simple nucleic acid sampling machine with simple equipment? Let’s take a look at my work.

Materials required:

BBC micro:bit V2 x 1

360°servo x 1

Ultrasonic sensor x 1

Nezha Breakout board x 1

Building Blocks x N

Paper cups or any other containers x 5

Cotton swabs x N

Setup Step diagram

1. Base part of sampling machine:

2. Main part of sampling machine:

Side

Front

Back

High angle shot

3. Claws:

Side

High angle shot

4. The body is combined with the claws

5. Access the sensor

Nezha Breakout board

Ultrasonic sensor

6. Complete the construction

7、 plus auxiliary materials: cotton swabs, paper cups

Program

1. Open the http://microbit.makecode.org programming platform. To program, we need to add a library: click ‘Extensions’ at the bottom of MakeCode, search for’ nezha ‘in the dialog box, and click

2、 Click Ne Zha, drag the building blocks of the steering gear, and set the torque and angle of the steering gear to 360°. The steering gear on the claw is connected to the S1 interface, with an Angle of 10°; The steering gear that controls the movement of claws up and down is connected to the s2 interface with an Angle of 170°; The steering gear controlling gear rotation is connected to S2 interface at an Angle of 50°.

3, the next preparation of the ultrasonic sensor. The ultrasonic wave is connected to the J1 interface of Nezha, and the Angle of the three steering engines is adjusted when the distance induced by the ultrasonic wave is less than or equal to 20, and the pause time is set. The complete procedure is as follows:

Code link: https://makecode.microbit.org/_YpX2PE8EHTAc

These are the complete steps of the nucleic acid sampling mechanism. You can also imagine transforming it into an automatic feeding machine and other works. Look forward to your more wonderful creation!