Full system — manual, sweep and homing

What do we want to do?

Combine sensing, movement, and touch-controlled operating modes.

Parts

• Arduino Uno + USB cable, breadboard, and jumper wires.
• Potentiometer, servo, and ultrasonic sensor with mounting bracket
• Active-HIGH touch module
• 7 LEDs and 7 × 330Ω resistors
• Suitable 5V servo supply

What to expect

Touch cycles between manual control, automatic sweeping, and homing. Homing stops on an object in the 20–30 cm zone and resumes searching when it leaves that zone. Three LEDs identify the mode; four indicate distance.