23 lines
470 B
JavaScript
23 lines
470 B
JavaScript
'use strict';
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const i2c = require('../');
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const MCP9808_ADDR = 0x18;
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const TEMP_REG = 0x05;
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const toCelsius = rawData => {
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rawData = (rawData >> 8) + ((rawData & 0xff) << 8);
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let celsius = (rawData & 0x0fff) / 16;
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if (rawData & 0x1000) {
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celsius -= 256;
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}
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return celsius;
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};
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i2c.openPromisified(1).
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then(i2c1 => i2c1.readWord(MCP9808_ADDR, TEMP_REG).
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then(rawData => console.log(toCelsius(rawData))).
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then(_ => i2c1.close())
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).catch(console.log);
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