It runs on mains power and uses a 100dB piezo buzzer for ear-splitting effectiveness to alert [Adam] whenever the freezer is at 32°F/0°C or above. If the Arduino loses sight of the DHT22 ...

Back in 2011, Elektor presented a DIY Ultrasonic Directive Speaker using an array of piezo ultrasonic transducers (up to 200) ...

YouTuber [MechnicalRedPanda] has recreated a DIY STM hack we covered about ten years ago, updating it to be primarily 3D-printed, using modern electronics, making it much more accessible to many ...

Our company manufactures a comprehensive line of audio indicators and transducers in piezo and electro-mechanical varieties, including microphones, speakers, and ...