Namaste Robot To Greet Automatically | Circuit and Code

The Namaste Robot system relies on a continuous feedback loop between an Arduino Uno, an ultrasonic distance sensor module, and servo motors integrated into a mechanical 3D-printed robot hand. Powered by an external power supply, the ultrasonic sensor periodically emits high-frequency sound waves and measures the echo return time to calculate the precise distance of an approaching person. This distance data is transmitted to the Arduino board via connecting wires. When the microcontroller detects that a visitor has crossed a predefined distance threshold, its internal logic triggers a pre-programmed sequence. The Arduino then generates pulse-width modulation (PWM) signals to drive the servo motors. Because these motors are mechanically linked to the joints of the InMoov-inspired robot hand, the precise angular rotation of the servos translates into a fluid, physical movement that closes the fingers together into a traditional 'Namaste' greeting gesture. Once the visitor moves out of the sensor's detection range, the Arduino commands the servos to return the hand to its resting position, completing the automated interaction cycle.