lsd-mcp3425

mcp3425 adc module for node.js (node-red)

general install

``

npm -g install lsd-mcp3425

`

test program

`test.js
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, 8
mcp3425.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

`node.js
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;
``