{
  "id": "keypad-1x4",
  "name": "1x4 membrane keypad (4 keys)",
  "category": "input",
  "pins": [
    {
      "name": "COM",
      "role": "ground",
      "notes": "Common line to GND. On some keypads the common is pin 2: check with a multimeter"
    },
    {
      "name": "K1",
      "role": "digital_out",
      "notes": "Key 1: to a GPIO with INPUT_PULLUP, reads LOW when pressed"
    },
    {
      "name": "K2",
      "role": "digital_out",
      "notes": "Key 2"
    },
    {
      "name": "K3",
      "role": "digital_out",
      "notes": "Key 3"
    },
    {
      "name": "K4",
      "role": "digital_out",
      "notes": "Key 4"
    }
  ],
  "bus": "gpio",
  "voltage": "3.3",
  "model": {
    "shape": "module",
    "size": [
      69,
      20,
      1
    ],
    "color": "#1A1A1A"
  },
  "keywords": [
    "keypad",
    "1x4",
    "membrane",
    "4 keys",
    "buttons",
    "tastierino",
    "pulsanti"
  ],
  "sources": [
    {
      "title": "Arduino reference",
      "section": "pinMode INPUT_PULLUP"
    },
    {
      "title": "Common 1x4 membrane keypad",
      "section": "5-pin ribbon: one common line and one line per key. Pin order varies"
    }
  ]
}