^{<strong>Robotic Arm</strong>}

<p dir="ltr">We present the design and evaluation of a low‑cost five‑degree‑of‑freedom (5‑DoF) wireless robotic arm suitable for household and light industrial pick‑and‑place tasks. The system employs an Arduino Uno as the main controller, NRF24L01 transceivers for a bidirectional 2.4 GHz link, standard hobby servo motors as actuators, and a joystick‑based human interface at the transmitter (TX). The receiver (RX) integrates a compact DC distribution board to simplify wiring and power delivery. We provide a minimal firmware stack for reliable packetized control, safety bounds on joint motion, and a simple calibration routine. Bench tests demonstrate repeatable point‑to‑point positioning with successful pick‑and‑place cycles and qualitative accuracy in the 90–95% range for repeated target poses within the arm workspace. The proposed architecture emphasizes affordability, ease of replication, and pedagogical clarity while offering a practical baseline for extensions such as sensor feedback (potentiometers, force sensing) and semi‑autonomous behaviors.</p>