Dia antes primera install

node_modules/i2c-bus/example/mcp9808-promise-plain-i2c-buffer.js

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+'use strict';
+
+const i2c = require('../');
+
+const MCP9808_ADDR = 0x18;
+const TEMP_REG = 0x05;
+
+const toCelsius = rawData => {
+  let celsius = (rawData & 0x0fff) / 16;
+  if (rawData & 0x1000) {
+    celsius -= 256;
+  }
+  return celsius;
+};
+
+const wbuf = Buffer.from([TEMP_REG]);
+const rbuf = Buffer.alloc(2);
+
+i2c.openPromisified(1).
+then(i2c1 => i2c1.i2cWrite(MCP9808_ADDR, wbuf.length, wbuf).
+  then(_ => i2c1.i2cRead(MCP9808_ADDR, rbuf.length, rbuf)).
+  then(data => console.log(toCelsius(data.buffer.readUInt16BE()))).
+  then(_ => i2c1.close())
+).catch(console.log);
+