Advanced Robots Challenge Card Ideas¶
Ideas for challenge cards built around richer robot sensors and actuators — servos, steppers, H-bridges, gyroscopes, sound, robot expression, and IoT — plus the USB power and workshop practices that support them (Chapters 18 and 20). These build on the drive-function and control-loop skills from Basic Robots.
Beginning¶
Servo Sweep Demo¶
Wire and program a servo motor to sweep back and forth between two fixed angles on a timer, introducing pulse-width control on its own before attaching the servo to any robot arm or gripper. Stretch goal: change the sweep so it pauses briefly at each end before reversing.
USB Power Check¶
Using a multimeter and the chapter's USB-A vs. USB-C comparison, correctly identify a robot's cable and connector type, measure its actual output voltage, and confirm it can safely power the robot's electronics. Stretch goal: compare the measured voltage of two different USB cables from the kit bin.
Gyroscope Orientation Reader¶
Wire a gyroscope or IMU sensor and print live tilt and orientation readings to the console, without yet using the data to control anything, to see the raw sensor output firsthand. Stretch goal: identify which reading changes when the sensor is tilted forward versus rolled sideways.
Robot Emotion Face (Static)¶
Wire a small display to show one fixed "face" — happy, confused, alert — representing the robot's current status, introducing the idea that a robot can communicate its state to a person without speaking. Stretch goal: design a second face and switch between them with a button.
Workshop Parts Labeling Station¶
Organize and label a bin of loose robot parts — motors, sensors, screws — following the chapter's storage and documentation practices, then write a one-page inventory so the next student can find everything without asking. Stretch goal: propose one change to the bin's organization that would have saved time during this challenge.
Intermediate¶
Stepper Motor Precision Turn¶
Wire and program a stepper motor to rotate a precise number of degrees, not just "spin," using the chapter's step-sequence concept, then verify the accuracy with a marked protractor. Stretch goal: chain two precise turns in a row and check whether the error compounds.
H-Bridge Speed and Direction Control¶
Wire a single DC motor through an H-bridge chip and write code that controls both its direction and its speed via PWM from one program, rather than only turning it on and off. Stretch goal: create a smooth ramp-up from stopped to full speed instead of an instant jump.
Gyroscope-Balanced Alert¶
Use live gyroscope readings to detect when a robot has been tipped past a set angle, triggering a buzzer or LED alert — turning raw sensor data from the earlier Gyroscope Orientation Reader challenge into a reactive behavior. Stretch goal: make the alert stop automatically once the robot is leveled again.
Sound Spectrum Visualizer¶
Read a sound sensor and display a simple live bar-graph or LED representation of loudness, or a basic frequency band, based on the chapter's frequency-spectrum work. Stretch goal: make the display react differently to a low hum versus a sharp clap.
Robot Voice Cue¶
Wire a small speaker or buzzer so the robot plays a distinct short sound cue for two different events — task complete versus obstacle detected — giving the robot an audible "voice" alongside any visual feedback. Stretch goal: add a third, different cue for a low-battery warning.
Advanced¶
Full Emotion Display Robot¶
Combine a display and a sound cue so the robot shows a matching "face" and plays a matching sound for at least three states — idle, thinking, alert — all driven by real sensor conditions rather than manually triggered. Stretch goal: add a fourth state for "task complete" with its own face and sound.
IoT Environmental Monitor Robot¶
Combine an IoT sensor kit reading — temperature or humidity — with a mobile robot chassis so the robot patrols a set path and logs or reports readings from multiple locations along the way. Stretch goal: flag any location where the reading crosses a chosen threshold.
Differential-Drive Precision Docking¶
Using timed-step precision or an encoder, program a robot to drive to a specific marked location and stop within a small tolerance — a "docking" maneuver combining differential-drive math with careful calibration. Stretch goal: dock successfully from two different starting positions without changing the code.
Multi-Sensor Fusion Robot¶
Combine at least three sensor types — for example gyroscope, sound, and distance — on one robot chassis, with priority logic deciding which sensor's data controls behavior at any given moment. A substantial paired build given the wiring and logic involved. Stretch goal: log which sensor "won" at each decision point during a test run.
USB-Powered Autonomous Demo Station¶
Design a complete, documented, self-contained robot station — correct USB power source, clearly labeled wiring, written setup instructions — that another mentor or student could power on and run with zero verbal explanation. Stretch goal: hand the station to someone who has never seen it and time how long it takes them to get it running from the instructions alone.