lsd-mcp3425
mcp3425 adc module for node.js (node-red)
general install
# npm -g install lsd-mcp3425
test program
var sleep = require('sleep');var async = require('async');var MCP3425 = require('lsd-mcp3425'); var mcp3425 = new MCP3425(0x68, '/dev/i2c-2');// init(bits, gain)// bits = 12, 14, 16// gain = 1, 2, 4, 8mcp3425.init(16, 1); async.forever( (callback) => { mcp3425.async_get_voltage((err, res) => { console.log(res); sleep.msleep(1000); callback(null); }); });setup for node-red
edit /root/.node-red/settings.js
functionGlobalContext: {
mcp3425:require('lsd-mcp3425')
// os:require('os'),
// octalbonescript:require('octalbonescript'),
// jfive:require("johnny-five"),
// j5board:require("johnny-five").Board({repl:false})
},
and Reboot
# reboot
node-red's function
var mcp3425 = context.get('mcp3425');if (!mcp3425) { var MCP3425 = global.get('mcp3425'); context.set( 'mcp3425', new MCP3425(0x68, '/dev/i2c-2') ); mcp3425 = context.get('mcp3425'); mcp3425.init(16, 1);}mcp3425.async_get_voltage((err, res) => { var msg = {}; msg.payload = res; node.send(msg);})return null;