pxt-calliope/docs/projects/rc-car/code.md
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2018-09-26 09:35:56 -07:00

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# Code
## Step 1: Add the Kitronik extension
Kitronik has an extension with blocks that program their motor driver. We need to add it to our project.
* Click on **Advanced**
* Click **Extensions**
* Type ``kitronik``, press **Enter**
* Select the **kitronik-motor-driver** extension
After the extension is loaded, you should see a new **Kitronik** category in the toolbox.
## Step 2: Round and round we go!
https://youtu.be/pD6tM1nXCPA
The first program has the car drive around in a circle for 5 seconds when the user presses the ``A`` button. This is simply done by turning both motor controllers on for 5 seconds.
```blocks-ignore
input.onButtonPressed(Button.A, () => {
basic.showIcon(IconNames.Happy)
kitronik.motorOn(kitronik.Motors.Motor1, kitronik.MotorDirection.Reverse, 100)
kitronik.motorOn(kitronik.Motors.Motor2, kitronik.MotorDirection.Forward, 100)
basic.pause(5000)
kitronik.motorOff(kitronik.Motors.Motor1)
kitronik.motorOff(kitronik.Motors.Motor2)
basic.showIcon(IconNames.SmallDiamond)
})
```
### ~ hint
**Protect your electronics**
Make sure to unplug the @boardname@ from the edge connector when you're connecting it to your computer. This helps protect everything from potential electrical problems.
### ~
Depending on how your wires are connected to the motor driver, your car may go backward instead of forward. If so, you can either swap the wires or change the ``MotorDirection`` in your code to get it to go the right way.
## Step 3: Figure eight
https://youtu.be/agor9wtiAkE
Instead of stopping after 5 seconds, we reverse the steering motor to turn in the other direction. This will create a figure eight path.
```blocks-ignore
input.onButtonPressed(Button.A, () => {
basic.showIcon(IconNames.Happy)
kitronik.motorOn(kitronik.Motors.Motor1, kitronik.MotorDirection.Reverse, 100)
kitronik.motorOn(kitronik.Motors.Motor2, kitronik.MotorDirection.Forward, 100)
basic.pause(3500)
kitronik.motorOn(kitronik.Motors.Motor2, kitronik.MotorDirection.Reverse, 100)
basic.pause(3500)
kitronik.motorOff(kitronik.Motors.Motor1)
kitronik.motorOff(kitronik.Motors.Motor2)
basic.showIcon(IconNames.SmallDiamond)
})
```
Great! The code to drive the car is done! Now let's get another @boardname@ and control the car remotely.
### ~button /projects/rc-car/connect
Connect
### ~
```package
pxt-kitronik-motor-driver=github:kitronikltd/pxt-kitronik-motor-driver#v0.0.3
```