DIY sonar scanner (practical experiments)

Starlink, Medical Ultrasound, 5G and my DIY sonar scanner have one thing in common: Phased arrays. Phased what..? My practical experiments convey the physics behind the manipulation of waves in a playful manner. The result is a real DIY sonar scanner. Check it out! Give my sponsor Aisler a try: My board: Browser based simulator: Scanner code: Links to parts and tools (affiliate links): 4 Channel Mosfet Switch: Solenoid: Soldering iron: Miniware Hot Plate: Flux: Syringe Pusher: Variable Power Supply: Arduino Nano clone: ESP32