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45 lines
1.9 KiB
Markdown
45 lines
1.9 KiB
Markdown
# Simple micro:bit V2 remote control car
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Since the micro:bit V2 can output 300 mA instead of 90 mA from its 3V pin, you can actually build a motor car with a simple breakout, a L9110S H-bridge motor driver board and a generic, small 5V USB power bank.
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This RC car needs another micro:bit (it can be either V1 or V2) as the remote controller.
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### Required hardware
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* 2 BBC micro:bit V2 (or one V2 and one V1)
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* a L9110s driver board
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* a cheap 2WD robot car chassis
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* a small 5V USB powerbank
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### Wiring
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| L9110S | micro:bit V2 |
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| --- | --- |
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| B-1A | P1 |
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| B-1B | P2 |
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| GND | GND |
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| VCC | 3V |
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| A-1A | P8 |
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| A-1B | P12 |
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And connect your power bank to the micro:bit V2's USB port.
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Be noted that many power banks shut themselves off when there are not enough current draw, which would happen when both motors are not running for a few seconds. You can try to turn on the "always on mode" or buy one of those cheap ones that don't shut off.
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If you have a micro:bit extension board that offer 5V output (either from USB connection or on-board batteries), a micro:bit V1 can be used on the car as well. Simply connect the VCC pin to the 5V pin.
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### Upload code
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Copy the content of following MicroPython code into the [official Python editor](https://python.microbit.org/v/2), connect the board and flash it:
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* [Controller](https://github.com/alankrantas/microbit-micropython-cookbook/blob/master/rc_car/rc_controller.py)
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* [Car](https://github.com/alankrantas/microbit-micropython-cookbook/blob/master/rc_car/rc_car.py)
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In both scripts the ```RADIO_CHANNEL``` variable defines the radio channel shared between the controller and the car. Change it if you are going to operate near other people also using micro:bit's radio functions.
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### Control
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Tilt the controller to different directions
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