Development of a remote control car by Joystick with Micro:bit

Purpose of this project:

In this project we will build a remotely controlled car (by radio) controllable by two Micro:bit cards.

The user will be able to drive the car by a joystick controller in three directions (front, right and left) and stop it.

Required components

• two Micro:bit boards
• two GPIO boards
• two relay wires connecting
• car chassis
• two wheel
• two motors
• one wheel

construction of the car

Mounting the joystick joystick with Micro:bit

You can connect:

• The +5V pin of the 3.3V joystick of the micro:bit
• The GND pin of the joystick to the GND of the micro:bit
• The VRx pin of the joystick to the pin P2 of the micro:bit
• VRy pin from joystick to pin P1 from micro:bit
• Pin SW from joystick to pin P0 from micro:bit

Assembling the car with Micro:bit

To make the assembling, one can connect

For the first relay:

• pin S to pin P0 of the Micro:bit board
• the pin (+) to pin 3.3V of the Micro:bit board
• the pin (-) to the GND of the Micro:bit board
• the pin ON to an energy of 5V

For the second relay:

• pin S to pin P1 of the Micro:bit board
• pin (+) to pin 3.3V of the Micro:bit board
• pin (-) to the GND of the Micro:bit board
• pin ON to an energy of 5V

For each of the two motors:

• the first terminal to the COM pin of the relay
• the second terminal to the GND terminal of the Micro:bit board

First makecode program

Here is the makecode program for the micro:bit card connected to the joystick controller:

When the joystick returns to its initial position (neutral): The 2 pins P1 and P2 of the micro:bit return values between 500 and 520 and the micro:bit board radio sends the word ‘stop’ to the Maqueen micro:bit board.

Second Makecode program

Here is the makecode program for the micro:bit card connected to the car.