How to use mcp-spi-adc - 10 common examples
To help you get started, we’ve selected a few mcp-spi-adc examples, based on popular ways it is used in public projects.
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openhomeautomation / smart-homes-pi-zero / 05 / meter_log.js View on Github 
// ID should be 6 characters long
piREST.set_id('34f5eQ');
piREST.set_name('energy_meter');
piREST.set_mode('bcm');
// Variables
current = 0;
power = 0;
// Start server
var server = app.listen(80, function() {
console.log('Listening on port %d', server.address().port);
});
// Sensor measurement loop
var sensor = mcpadc.open(channel, {speedHz: 20000}, function (err) {
if (err) throw err;
// Measurement interval
setInterval(function () {
// Read
sensor.read(function (err, reading) {
if (err) throw err;
// Calculate current
var measuredVoltage = reading.value * 3.3;
var measuredCurrent = (measuredVoltage/resistance) * 2000 / 1.41;
// Calculate power
var power = voltage * measuredCurrent;// ID should be 6 characters long
piREST.set_id('34f5eQ');
piREST.set_name('energy_meter');
piREST.set_mode('bcm');
// Variables
current = 0;
power = 0;
// Start server
var server = app.listen(80, function() {
console.log('Listening on port %d', server.address().port);
});
// Sensor measurement loop
var sensor = mcpadc.open(channel, {speedHz: 20000}, function (err) {
if (err) throw err;
// Measurement interval
setInterval(function () {
// Read
sensor.read(function (err, reading) {
if (err) throw err;
// Calculate current
var measuredVoltage = reading.value * 3.3;
var measuredCurrent = (measuredVoltage/resistance) * 2000 / 1.41;
// Calculate power
var power = voltage * measuredCurrent;// ID should be 6 characters long
piREST.set_id('34f5eQ');
piREST.set_name('energy_meter');
piREST.set_mode('bcm');
// Variables
current = 0;
power = 0;
// Start server
var server = app.listen(80, function() {
console.log('Listening on port %d', server.address().port);
});
// Sensor measurement loop
var sensor = mcpadc.open(channel, {speedHz: 20000}, function (err) {
if (err) throw err;
// Measurement interval
setInterval(function () {
// Read
sensor.read(function (err, reading) {
if (err) throw err;
// Calculate current
var measuredVoltage = reading.value * 3.3;
var measuredCurrent = (measuredVoltage/resistance) * 2000 / 1.41;
// Calculate power
var power = voltage * measuredCurrent;// ID should be 6 characters long
piREST.set_id('34f5eQ');
piREST.set_name('energy_meter');
piREST.set_mode('bcm');
// Variables
current = 0;
power = 0;
// Start server
var server = app.listen(80, function() {
console.log('Listening on port %d', server.address().port);
});
// Sensor measurement loop
var sensor = mcpadc.open(channel, {speedHz: 20000}, function (err) {
if (err) throw err;
// Measurement interval
setInterval(function () {
// Read
sensor.read(function (err, reading) {
if (err) throw err;
// Calculate current
var measuredVoltage = reading.value * 3.3;
var measuredCurrent = (measuredVoltage/resistance) * 2000 / 1.41;
// Calculate power
var power = voltage * measuredCurrent;// ID should be 6 characters long
piREST.set_id('34f5eQ');
piREST.set_name('energy_meter');
piREST.set_mode('bcm');
// Variables
current = 0;
power = 0;
// Start server
var server = app.listen(80, function() {
console.log('Listening on port %d', server.address().port);
});
// Sensor measurement loop
var sensor = mcpadc.open(channel, {speedHz: 20000}, function (err) {
if (err) throw err;
// Measurement interval
setInterval(function () {
// Read
sensor.read(function (err, reading) {
if (err) throw err;
// Calculate current
var measuredVoltage = reading.value * 3.3;
var measuredCurrent = (measuredVoltage/resistance) * 2000 / 1.41;
// Calculate power
var power = voltage * measuredCurrent;// ID should be 6 characters long
piREST.set_id('34f5eQ');
piREST.set_name('energy_meter');
piREST.set_mode('bcm');
// Variables
current = 0;
power = 0;
// Start server
var server = app.listen(80, function() {
console.log('Listening on port %d', server.address().port);
});
// Sensor measurement loop
var sensor = mcpadc.open(channel, {speedHz: 20000}, function (err) {
if (err) throw err;
// Measurement interval
setInterval(function () {
// Read
sensor.read(function (err, reading) {
if (err) throw err;
// Calculate current
var measuredVoltage = reading.value * 3.3;
var measuredCurrent = (measuredVoltage/resistance) * 2000 / 1.41;
// Calculate power
var power = voltage * measuredCurrent;return new Promise((resolve, reject) => {
let tempSensor = Mcpadc.open(0, {speedHz: 20000}, err => {
if (err) reject({ type: 'ERROR', message: 'Could not open mcpadc.', httpCode: 400, data: err })
tempSensor.read((err, reading) => {
if (err) reject({ type: 'ERROR', message: 'Could not read mcpadc.', httpCode: 400, data: err })
// map read value to from range 1(no humidity) - 0.3(max humidity) to range 0 - 100
let humidity = Util.map_range(reading.value, 1, 0.3, 0, 100);
resolve({
message: 'Here is the humidity.',
type: 'SUCCESS',
httpCode: 200,
data: [{"type": "HUMIDITY", "value": humidity}]
})
})
})
})
}RED.nodes.createNode(this,n);
this.pin = n.pin || 0;
this.interval = n.interval || 1000;
this.dnum = parseInt(n.dnum || 0);
this.bus = parseInt(n.bus || 0);
this.dev = n.dev || "3008";
var node = this;
var cb = function (err) { if (err) { node.error("Error: "+err); } };
var opt = { speedHz:20000, deviceNumber:node.dnum, busNumber:node.bus };
var chans = parseInt(this.dev.substr(3));
try {
fs.statSync("/dev/spidev"+node.bus+"."+node.dnum);
if (mcp3xxx.length === 0) {
for (var i=0; i= 0) && (pay < chans)) { pin = pay; }
else { node.warn("Payload needs to select channel 0 to "+(chans-1)); }
}
else { pin = parseInt(node.pin); }this.pin = n.pin || 0;
this.interval = n.interval || 1000;
this.dnum = parseInt(n.dnum || 0);
this.bus = parseInt(n.bus || 0);
this.dev = n.dev || "3008";
var node = this;
var cb = function (err) { if (err) { node.error("Error: "+err); } };
var opt = { speedHz:20000, deviceNumber:node.dnum, busNumber:node.bus };
var chans = parseInt(this.dev.substr(3));
try {
fs.statSync("/dev/spidev"+node.bus+"."+node.dnum);
if (mcp3xxx.length === 0) {
for (var i=0; i= 0) && (pay < chans)) { pin = pay; }
else { node.warn("Payload needs to select channel 0 to "+(chans-1)); }
}
else { pin = parseInt(node.pin); }
if (pin !== null) {this.interval = n.interval || 1000;
this.dnum = parseInt(n.dnum || 0);
this.bus = parseInt(n.bus || 0);
this.dev = n.dev || "3008";
var node = this;
var cb = function (err) { if (err) { node.error("Error: "+err); } };
var opt = { speedHz:20000, deviceNumber:node.dnum, busNumber:node.bus };
var chans = parseInt(this.dev.substr(3));
try {
fs.statSync("/dev/spidev"+node.bus+"."+node.dnum);
if (mcp3xxx.length === 0) {
for (var i=0; i= 0) && (pay < chans)) { pin = pay; }
else { node.warn("Payload needs to select channel 0 to "+(chans-1)); }
}
else { pin = parseInt(node.pin); }
if (pin !== null) {
mcp3xxx[pin].read(function (err, reading) {mcp-spi-adc
MCP3002/4/8, MCP3202/4/8 and MCP3304 SPI analog to digital conversion
