Caption:
Team troubleshooting inconsistent sensor readings while reviewing code and wiring.

Description:
The obstacle avoidance system continued to behave unpredictably and produced voltage values that did not match expected distance changes. The group modified the program by shifting how the signal was interpreted, moving from a more fluid analog style toward clearer digital boundaries that could force the robot to make decisions with less ambiguity. We redefined trigger points, reviewed pin configurations, and walked through the logic line by line. Multiple instructors were consulted to confirm that the issue was not rooted in assembly mistakes or incorrect electrical routing. Even after these interventions, the voltage floor remained near 3.85V, preventing accurate differentiation between near and far obstacles.

PLTW Step:
Test and Evaluate because we were deliberately running trials, gathering performance evidence, and diagnosing why the design was not meeting expectations.

Outcome:
We eliminated several possible causes and narrowed the failure to calibration or sensor behavior, giving us a clearer path forward.

Caption:
Team strategy meeting to protect timeline and prioritize essential deliverables.

Description:
Recognizing that continued attempts at the same fix were not producing new information, the team paused technical work and shifted into decision making. We reviewed our project agreement, upcoming benchmarks, and grading expectations. By comparing the time remaining against unfinished mechanical and integration tasks, we determined that remaining locked on one malfunction would threaten overall completion. The conversation centered on efficiency, opportunity cost, and sequencing. Rather than abandoning the sensor permanently, we chose to temporarily redirect effort toward components that would unlock future assembly.

PLTW Step:
Identify Problem and Plan because we redefined what the most urgent obstacle truly was.

Outcome:
We regained control of the schedule and ensured progress would continue this week.

Mechanical inspection reveals hinge restriction and door misalignment.

Description:
Attention moved to the dog carrier where operational flaws became obvious during handling. The hinges prevented full travel, contact between surfaces created resistance, and the door stuck when minor pressure was applied. Measurements were retaken, interference points were identified, and hardware positions were adjusted to allow smoother rotation. Reinforcement was added so the pivot would maintain alignment even after repeated use. These improvements transformed the carrier from a fragile prototype into a component capable of real deployment.

PLTW Step:
Improve / Redesign because we modified an existing build to increase reliability.

Outcome:
The carrier now functions with a wider range of motion and predictable performance.

Caption:
Installation of ultrasonic detection system and rotating scan mechanism.

Description:
With mechanical barriers reduced, we returned to obstacle avoidance using a more structured build approach. The ultrasonic sensor was mounted securely, the servo was positioned to enable directional reading, and jumper wiring was organized to prevent tangling during motion. Power distribution and communication paths were double checked before energizing the system. This phase emphasized stability, repeatability, and physical integrity so future programming would rest on dependable hardware.

PLTW Step:
Build because we translated plans into tangible structure.

Outcome:
A complete sensing assembly was ready for live code integration.

Caption:
Tno rials confirming successful object detection and rerouting.

Description:
Programming resumed with the newly stabilized hardware. Distance values were monitored, reaction thresholds were tuned, and repeated passes were conducted across the floor with different obstacle placements. Early attempts showed hesitation, but incremental adjustments improved response time and turning confidence. By the end of testing, the robot consistently identified barriers and redirected itself without manual intervention.

PLTW Step:
Test and Evaluate because performance data guided refinement.

Outcome:
Obstacle avoidance moved from uncertain concept to working capability.