Spring Sale: 5% OFF Over $89, Code: Elephant5; 10% OFF Over $149, Code:Elephant10



Robot Kit for Micro:bit Tutorial: 6.5 Radar detector

Posted by Fiona Su on

Robot Kit for Micro:bit Tutorial: 6.5 Radar detector

1.Preparation

1-1.The position of the Ultrasonic module on the robot car

1-2.Learn about the principle of Ultrasonic module

Programming method:

Mode 1 online programming: First, we need to connect the micro:bit to the computer by USB cable. The computer will pop up a USB flash drive and click on the URL in the USB flash drive: http://microbit.org/ to enter the programming interface. Add the Yahboom package: https://github.com/lzty634158/Tiny-bit to program.

Mode 2 offline programming: We need to open the offline programming software. After the installation is complete, enter the programming interface, click【New Project】, add Yahboom package: 

https://github.com/lzty634158/Tiny-bit, you can program. 

In the picture shown below, the ultrasonic module with red wire frame.

Ultrasonic ranging principle:

The ultrasonic wave has two ultrasonic probes, which are used for transmitting and receiving ultrasonic waves, respectively, and the measurement range is about 3-450 cm. First, input a 15us high level signal to the SCL (TRIG) pin to start the ranging function of module.

After the ranging function is started, the module will automatically send out 8 40 kHz ultrasonic pulses and automatically detect whether there is a signal return. This step is automatically done internally by the module. When the echo signal is detected, the echo terminal SDA (ECHO) pin will output a high level.

The high level duration is the time from the transmission to the return of the ultrasonic wave. We can calculate the current distance by the high level duration.

Formula: Distance = High Time * Sound Speed (340M/S)/2

2.Learning goal

2-1. Learn how to use ultrasonic return distance graphically program building blocks, RGB Searching light graphically program building blocks and music graphically program building blocks

2-2.The function is realized by programming: Tiny-bit will keep moving forward, while the buzzer emits a lower sound "probe", the RGB searching light is green, and the forward arrow is displayed on the micro:bit dot matrix. When there is an obstacle in front of it, the buzzer will make a high sound "start alarm" and the RGB searching light will become red.

3.Search for block

The following is the location of the building blocks required for this programming.

image.png

image.png

image.png

image.png

image.png

4.Combine block

The summary program is shown below:

Note: The speed and time parameters in the program can be adjusted according to the actual situation.

5.Experimental phenomena 

After the program is downloaded, Tiny-bit will keep moving forward, while the buzzer emits a lower sound "probe", the RGB searching light is green, and the forward arrow is displayed on the micro:bit dot matrix. When there is an obstacle in front of it, the buzzer will make a high sound "start alarm" and the RGB searching light will become red.

The code of the experiment: 5.Radar detector.rar

Playing with Tiny bit Microbit Robot Tutorial: 

0 comments

Leave a comment

Please note, comments must be approved before they are published