Welcome to Tiny:bit Robot Car repository

Learning goal：

In this lesson, we will learn how to read sound sensor data, and switch the light color based on the detected data through Python programming.

Introduction of Sound sensor principle:

The role of the sound sensor is equivalent to a microphone, which can be used to receive sound wave vibration, so as to detect changes in the current ambient sound, but it cannot measure the intensity of noise. Built-in condenser cylindrical microphone that is sensitive to sound, sound waves can vibrate electret films in microphones, causing the capacitance to change, thereby generating a tiny voltage corresponding to it.

The position of the Voice sensor module in the robot.

! ! ! Note: In this experiment, we need to install the jumper cap in the position shown below.

Code:

Please use the MU software to open the Voice control light.py file we provided.

1) Import the library needed for this lesson from micro:bit, display is used for dot matrix display, Image calls the built-in image, pin12 is the pin of the body colorful lights, neopixel drives the body colorful lights, and tinybit controls the car.

display.show (Image.HAPPY): Display a smile on micro:bit dot matrix.

np = neopixel.NeoPixel (pin12, 2): Initialize the body colorful lights. The first parameter is the pins connected to the lights, and the second parameter is the total number of RGB lights.

np.clear (): Clear the body colorful lights.

tinybit.car_HeadRGB (0, 0, 0): Clear the head RGB searchlight.

item = 0: Declare item as a global variable, and initialize it to 0.

Code as shown below:

2) voice = tinybit.getVoicedata()：Read the data of the sound sensor and save it to the variable voice.

If the variable voice> 100, it means that the light needs to be switched. First, a random number of 1 to 6 is generated and stored in the variable item. Then the color of the front RGB searchlight and the body colorful light are randomly set.

Code as shown below:

3) Determine the value of item. Different values display different patterns on the micro:bit dot matrix.

Code as shown below:

Programming and downloading：

1.You should open the Mu software, and enter the code in the edit window, , as shown below.

Note! All English and symbols should be entered in English, and the last line must be a space.

2.You can click the “Check” button to check if our code has an error. If a line appears with a cursor or an underscore, the program indicating this line is wrong.

3.Click “REPL” button,check whether the tinybit library has been downloaded. If not, please refer to the [preparation before class]---> [Python programming]

4.Click the “Flash” button to download the program to micro:bit board.

If the program is wrong or the experimental phenomenon is wrong after downloading, please confirm whether you have downloaded the Buildingbit libraryhex file we provided to the micro: bit board.

For the specific method of adding library files, please refer to 【1.Preparation before class】---【Python programming】

Experimental phenomena:

After download is complete, open the power switch. Micro:bit will display a smile on dot matrix, we need to put robot car on the desk.When we Shooting table, the lights of the robot will be  change color randomly.