Keyboard Control

To stop a moving device, define its behavior when a key is released or communication is lost, as well as when a key is pressed.

Reproduce behavior using an input event list. Connecting a real keyboard or device is a separate step that connects the same processing function to the event receiver.

Starting conditions

$t=\begin{bmatrix}0&0.1&0.2&0.3&0.4&0.5\end{bmatrix}$ s, key=[w,w,release,d,quit,w]. Set w=(1,0) and d=(0,-1) m/s.

Procedure

1. Create a pure function that converts each input into vx, vy, and termination state.
2. Set velocity to 0 on release, and ignore all inputs after quit.
3. Record the command vector and state for each input row.

Results to retain

• A processing table with 6 input rows and a processing function.

Starting conditions

Assume the velocity from activity 1 is maintained until the next input. The initial position is (0,0) m.

Procedure

1. Calculate Δposition=v*Δt for each interval.
2. Create a position table over time and an xy trajectory plot.
3. Compare with the result when all input intervals are changed to .2 s.

Results to retain

• Compare trajectories and final positions under the two interval conditions.

Starting conditions

Add a record with repeated w key events at $t\in\{0,.01,.02\}$ s, followed by .5 s without input. Set the timeout to .2 s.

Procedure

1. Compare the behavior to ensure repeated inputs set velocity rather than accumulate acceleration commands.
2. Add a rule to stop when .2 s has elapsed since the last input.
3. Record how commands and positions differ before and after applying a timeout.

Results to retain

• Plots before and after applying a timeout, and 3 sentences describing the behavior rules.