{
  "id": "piezo-disc",
  "name": "Piezo disc 27 mm",
  "category": "output",
  "pins": [
    {
      "name": "+",
      "role": "digital_in",
      "needsOutput": true,
      "notes": "Red wire. To a PWM-capable GPIO (ledc / tone). Quiet: a piezo needs a high voltage to be loud"
    },
    {
      "name": "-",
      "role": "ground",
      "notes": "Black wire"
    }
  ],
  "bus": "gpio",
  "voltage": "3.3-5",
  "model": {
    "shape": "led",
    "size": [
      27,
      27,
      0.5
    ],
    "color": "#D9B45A"
  },
  "keywords": [
    "piezo",
    "piezo disc",
    "buzzer",
    "knock",
    "tone",
    "disco piezoelettrico",
    "cicalino"
  ],
  "sources": [
    {
      "title": "Murata piezoelectric sounder (7BB-27-4) datasheet",
      "section": "Resonant frequency about 4.6 kHz"
    },
    {
      "title": "Espressif ESP-IDF Programming Guide",
      "section": "LEDC (LED PWM controller)"
    }
  ]
}