Getting Started with BPI-QCar

About BPI-QCar

BPI Q-Car with micro:bit

BPI Q-Car with BPI-Bit

BPI-QCar with BPI-AI board

Banana PI BPI Q-Car,which is a robot focusing on maker education.Compatible with Web:Bit(BPI: Bit) and Micro:Bit development boards.Small car body, highly integrated functions, plug and play, can quickly children's attention, complete the quick start of graphics programming, cultivate independent thinking and logical thinking ability

Key Features

• support Micro:bit, PBI:bit(Web:bit) and BPI-AI(WEB:AI) boards

• support Makecode graphical programming(with micro:bit)，support Webduino graphical programming（with BPI:bit）,and it also support MicroPython arduino（Micro:bit/BPI:bit）

• Compact body, strong integrity

• N20 Miniature reducer

• Infrared emission, infrared reception, line patrol, speed measurement, atmosphere lamp, I2C interface (support 3.3V and 5V), ultrasonic interface, buzzer, steering gear interface, needle row expansion port, expansion screw hole, etc...Fully functional, strong expansibility

• Easy to use it.

BPI-QCar with BPI:Bit for Arduino IDE

Arduino is an open source electronic prototyping platform that is flexible and easy to use.With the help of the community, BPI: BIT can be programmed with the Arduino environment, which you can refer to in the tutorial BPI:bit_for_Arduino

Motor control

Learning Objectives: Master the basic motor control method of Q-CAR

Program effect display: car forward 1 second, stop 100ms, back 1 second, stop 100ms, left 1 second, stop 100ms, right turn 1 second, stop 100ms.

Arduino code link：https://github.com/BPI-STEAM/Q-Car/tree/master/SoftWare/Web_Bit_Arduino/Motor_Demo

Ambient light control

Learning Objectives: To understand the basic usage of Q-CAR RGB atmosphere light

Program effect display: bottom RGB atmosphere light red, green, blue three color mixing gradient display a variety of colors, showing a color breathing effect.

Arduino code link：https://github.com/BPI-STEAM/Q-Car/tree/master/SoftWare/Web_Bit_Arduino/Pixel_Demo

Ultrasonic sensor control

Learning objective: master the use of Q-CAR ultrasonic sensor

Program effect display: serial port display ultrasonic measured distance data.

Arduino code link：https://github.com/BPI-STEAM/Q-Car/tree/master/SoftWare/Web_Bit_Arduino/Ultrasonic_Demo

How to use buzzer

Learning objective: master the use of BPI-QCAR buzzer

Program effect display: the buzzer play "little star music"

Arduino code link：https://github.com/BPI-STEAM/Q-Car/tree/master/SoftWare/Web_Bit_Arduino/Buzzer_Demo

IR control

Objective: To master the infrared remote control of Q-CAR

Program effect display: infrared remote control Q-CAR forward and backward and turn

Arduino code link：https://github.com/BPI-STEAM/Q-Car/tree/master/SoftWare/Web_Bit_Arduino/IR_Control_Demo

Ultrasonic obstacle avoidance

Program effect display: boot the car forward, ultrasonic detection of the front distance, if the distance is less than 8cm, the car left and right to check the obstacles on both sides, choose the direction of the farther distance to turn, to avoid obstacles.

Parts preparation: M2 copper column ×2, M2 screw ×2, SR04 ultrasonic module ×1, ultrasonic bracket ×1, steering gear bracket ×1（Download address of bracket），DuPont line number, insert SR04 interface in front。

Arduino code link：https://github.com/BPI-STEAM/Q-Car/tree/master/SoftWare/Web_Bit_Arduino/Avoidance_Demo

BPI-QCar with Micro:Bit use MakeCode

MakeCode programming to light up the LED on Micro:Bit

Learning Objectives: Familiarize yourself with basic Makecode applications and display some graphics or text on the Micro:Bit 5*5LED matrix.

Open the Makecode programming environment web side of Micro:Bit：https://makecode.microbit.org/

Create a new project and connect the Makecode blocks with the following routine. For example, the first block "Show Leds" can be found in the "Basic" options column. This block can edit the desired graphics

Right-click building blocks to carry out some operations on the building blocks, such as add notes, delete copy building blocks, as well as access to the corresponding documentation of the building blocks, this for the first time people can provide great help.

The MakeCode programming environment has an emulator with its own simulation of the program to view the effect in real time, usually displayed at the top left

The Makecode programming environment also supports importing project files from outside, such as.hex files that are compiled by Makecode

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-display-graphics.hex

Note：The correct way to import *.hex file is to download the.hex file from the link above and then import it into the MakeCode, rather than directly importing the link. External project links import the MakeCode differently

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly

Micro:bit's Button control - Base

Learning Objectives: Use the two buttons A/B on Micro:Bit to control the graphics to be output by the LED matrix

On the basis of the section "Using Makecode Programming to Light Micro:Bit", find the building block "On Button A Pressed" in the "Input" option column of Makecode to program

The routine is shown in the figure below. Press the A button to display the English character "A", press the B button to display the English character "B", and press the AB button to display A pattern shaped like A banana

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-Using_the_button_1.hex

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly

Micro:bit's Button control -advanced

Learning objectives: Makecode programming to achieve a count and display button control procedures

Building on the previous section, create a new variable called "A_was_pressed_times" in the "Variables" section of the Makecode. This will generate multiple building blocks for the variable in the "Variables" section

Combine the addition blocks in the "Math" TAB and the Mosaic blocks in the "Variables" TAB. Refer to the following legend

At this point, we realized in the Makecode programming and made A use of the addition counting program, press A button A count to add 1 at the same time the counting value output to the LED matrix, press A button B count to return to 0 and clear the LED matrix display

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-Using_the_button_2.hex

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly

The wheel speed measurement

Learning Objectives: Using Makecode programming to read the high and low level signals of the infrared pair tube used for wheel speed measurement on BPI-QCAR and calculate the wheel speed with counting method

The routine is as shown in the figure below. The program is burned into Micro:bit, and the Micro:bit is connected to BPI-QCar. At this time, the left and right wheels of Q-CAR can be read from the USB serial port to the left and right wheel speed

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-Q-Car_velocity_measurement_module.hex

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly

Motor control

Learning Objectives: Using Makecode programming to achieve QCar left and right motor forward and reverse control

Routines as shown in the figure below, the program is burned into the Micro: BIT, the Micro: BIT and Q-CAR connection. Press the a button onceleft ,and right motor will be turned to 2s at the same time, reverse 2s at the same time, right motor is turned to 2s alone, left motor is turned to 2s alone,two motors stop.

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-Q-Car_Motor_control_module.hex

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly

Ambient light control

Learning Objectives: Use Makecode programming to control 10 WS2812B color atmosphere lamps on BPI-QCar

The routine is as shown in the figure below. The program is burned into the Micro: BIT, and the Micro: BIT is connected to the Q-CAR. The 10 WS2812B lights on the Q-CAR will simultaneously cycle the rainbow light effect with 1800ms

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-Q-Car_Pixel.hex

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly

Ultrasonic sensor control

Learning Objectives: Using Makecode programming to control the HC-SR04 ultrasonic extension module on BPI-QCar

Routine as shown below, burn the program into Micro:BIT, connect Micro:BIT with BPI-QCar, connect HC-SR04 ultrasonic extension module with BPI-QCar, connect 5V power supply with BPI-QCar

The distance detected by the ultrasonic sensor and the temperature sensor data on the Micro:Bit can be read from the USB serial port of the Micro:Bit. The temperature calibration of the ultrasonic sensor is realized by the routine

Distance=85.815|Temperature=21

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-Q-car_Ultrasonic_ranging.hex

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly

Use the buzzer

Learning Objectives: Write a piece of music with Makecode and play it on the BPI-QCar buzzer

The routine is shown in the figure below. Burn the program into Micro:Bit, connect Micro:Bit to BPI-QCar,press the a button once，and the buzzer on BPI-QCar will play the song twice in a cycle

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-Q-car_Music_Arrangement.hex

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly

Line patrol

Learning Objectives: using makecode programming to realize BPI-QCar line patrol driving, line patrol infrared tube analog value calibration, ultrasonic ranging and parking in case of obstacles

Routine as shown in the figure below, the program burned into the Micro:Bit , will Micro:Bit Connect with BPI-QCar and turn on the power switch,

When the LED matrix displays the right arrow, place the two infrared tubes of Q-car above the white road around the line.

Press button a and wait until the calibration procedure is completed. The LED matrix will display the left arrow. At this time, make the front of Q-car face the line travel direction.

Press button B and Q-car will start line patrol driving. During driving, if the ultrasonic ranging module detects an object with a distance of less than or equal to 10cm in front, Q-car will stop.

Routine project file：https://github.com/Wind-stormger/Makecode/blob/master/microbit-Q-car_Line_tracking.hex

The project file can be imported into Makecode to view and edit after downloading to local, or it can be directly burned into Micro:Bit through USB and run directly