42140-app-controlled-transformation-vehicle: Add extra demo.

- Add additional program.
- Apply formatting.
- Fix image URL.
- Reduce image size.

Fixes https://github.com/pybricks/pybricks-projects/issues/89

sets/technic/42140-app-controlled-transformation-vehicle/index.md

@@ -2,8 +2,8 @@
 title: "App-Controlled Transformation Vehicle"
 number: 42140
 image:
-    local: "42131-app-controlled-transformation-vechicle.jpg"
+    local: "42140-app-controlled-transformation-vehicle.jpg"
     credit: "LEGO"
 layout: set
 description: "Fast-action fun in a model that flips! Build and play with 2 vehicles in 1 model with this App-Controlled Transformation Vehicle that flips when it hits a wall"
----
+---

sets/technic/42140-app-controlled-transformation-vehicle/powered-up-remote/index.md

@@ -22,3 +22,9 @@ Up Remote.
 ```python
 {% include_relative main.py %}
 ```
+
+Additional program submitted by [@mikeyupol](https://github.com/mikeyupol):
+
+```python
+{% include_relative main2.py %}
+```

sets/technic/42140-app-controlled-transformation-vehicle/powered-up-remote/main.py

@@ -38,7 +38,9 @@ while True:
         SPEED = speed_levels[current_speed_index]  # Update SPEED
 
     if right_button_pressed and not prev_right_button_pressed:
-        current_speed_index = min(len(speed_levels) - 1, current_speed_index + 1)  # Increase speed index
+        current_speed_index = min(
+            len(speed_levels) - 1, current_speed_index + 1
+        )  # Increase speed index
         SPEED = speed_levels[current_speed_index]  # Update SPEED
 
     # Store the current state for the next iteration

sets/technic/42140-app-controlled-transformation-vehicle/powered-up-remote/main2.py

@@ -0,0 +1,65 @@
+from pybricks.pupdevices import Motor, Remote
+from pybricks.hubs import TechnicHub
+from pybricks.parameters import Button, Color, Direction, Port
+from pybricks.tools import wait, StopWatch
+
+# This drives like a car.
+# Left +/- control going forwards/backwards, and right +/- turn.
+# When the vehicle is moving turn is gradual, when it's stationary turn is faster.
+
+remote = Remote()
+
+hub = TechnicHub()
+
+# Set very high speed limits to ensure maximum is reached.
+DRIVE_SPEED = 10000
+TURN_SPEED = 650
+DRIVE_ACCELERATION = 7000
+
+# Initialize the motors.
+right_motor = Motor(Port.A, Direction.COUNTERCLOCKWISE)
+left_motor = Motor(Port.B)
+
+left_motor.control.limits(acceleration=DRIVE_ACCELERATION)
+right_motor.control.limits(acceleration=DRIVE_ACCELERATION)
+
+while True:
+    # Check which buttons are pressed
+    wait(10)
+    pressed = remote.buttons.pressed()
+
+    # Choose forward/backward and turn right/left based on pressed buttons
+    left_speed = 0
+    right_speed = 0
+    pitch, roll = hub.imu.tilt()
+    sign = -1 if abs(roll) > 90 else 1
+    speed = sign * DRIVE_SPEED
+    turn = sign * TURN_SPEED
+    if Button.LEFT_PLUS in pressed or Button.LEFT_MINUS in pressed:
+        # Going forwards/backwards
+        left_speed = speed
+        right_speed = speed
+
+        # Turn slowly when moving
+        turn_right = Button.RIGHT_PLUS in pressed
+        turn_left = Button.RIGHT_MINUS in pressed
+        if (turn_right and sign > 0) or (turn_left and sign < 0):
+            right_speed = turn
+        elif turn_right or turn_left:
+            left_speed = turn
+
+        if Button.LEFT_MINUS in pressed:
+            left_speed *= -1
+            right_speed *= -1
+    else:
+        # Not moving, fast turn
+        if Button.RIGHT_PLUS in pressed:
+            left_speed = DRIVE_SPEED
+            right_speed = -DRIVE_SPEED
+        if Button.RIGHT_MINUS in pressed:
+            left_speed = -DRIVE_SPEED
+            right_speed = DRIVE_SPEED
+
+    # Activate the driving motors.
+    left_motor.run(left_speed)
+    right_motor.run(right_speed)