I'm trying to get the MCP3008 to work on my Raspberry Pi 4. I'm getting a fatal error as below. Any ideas?

/home/pi/webserver.js:152
if (err) throw err;
^
Error: ENOENT, No such file or directory

Line 152 is in this bit of code:

const mcpadc = require('mcp-spi-adc');

const tempSensor = mcpadc.open(5, {speedHz: 20000}, err => {
    if (err) throw err;

The installation of the package went like this:

npm install mcp-spi-adc
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN [email protected] No repository field.

+ [email protected]
updated 1 package and audited 140 packages in 2.536s

Hi,
Would you consider a pull request adding support for the ADS1256 from TI?
It's a 24-bit SPI ADC available on a commodity shield called Waveshare High Precision AD/DA.
Proper handling would require multiple SPI transactions and individual pin management (reset, data ready etc).
Additional features are PGA, differential readings etc.
However, basic handling seems to work with minimal changes on top of your current implementation.
Would you take such changes into consideration?

Just wondering if you've tested to see what the actual maximum achievable sampling rate is with this library?

With the overhead of nodejs I'm wondering if it's possible to get 5k samples/sec on a raspberry pi?

I'm trying to use this lib with webpack or react and got this error.

Node: v14.0.0
NPM: v6.14.4

Is it possible to have the type script interface for this library?
This would be great.
Thanks

Is it possible to specify differential mode for any of the channels? This feature is available in the chip. If not, how about adding it?

Thanks,
Tom

This and other Node.js native modules are now not compatible with the electron framework because of that issue: electron/electron#18397 .
I think the solution may be quite easy for library developers, which I am not, so I cannot tell for sure.

Hi Can the MCP3201 be added ?

Hello i get the Error Message

`

And when i try this Script the javascript Instanz crash in IoBroker

`createState('Analogmodul.Channel0',0,read1);
createState('Analogmodul.Channel1',0,read2);
createState('Analogmodul.Channel2',0,read3);
createState('Analogmodul.Channel3',0,read4);

const mcpadc = require('mcp-spi-adc');

function read1(){
const input1 = mcpadc.openMcp3204(0, {busNumber: busNumber, deviceNumber:deviceNumber, speedHz: 20000}, (err) => {
if (err) throw err;

setInterval(() => {
input1.read((err, reading) => {
if (err) throw err;

  setState("Analogmodul.Channel0",(reading.rawValue)),true;
});

}, Interval);
});
}

function read2(){
const input2 = mcpadc.openMcp3204(1, {busNumber: busNumber, deviceNumber:deviceNumber, speedHz: 20000}, (err) => {
if (err) throw err;

setInterval(() => {
input2.read((err, reading) => {
if (err) throw err;

  setState("Analogmodul.Channel1",(reading.rawValue)),true;
});

}, Interval);
});
}

function read3(){
const input3 = mcpadc.openMcp3204(2, {busNumber: busNumber, deviceNumber:deviceNumber, speedHz: 20000}, (err) => {
if (err) throw err;

setInterval(() => {
input3.read((err, reading) => {
if (err) throw err;

  setState("Analogmodul.Channel2",(reading.rawValue)),true;
});

}, Interval);
});
}

function read4(){
const input4 = mcpadc.openMcp3204(3, {busNumber: busNumber, deviceNumber:deviceNumber, speedHz: 20000}, (err) => {
if (err) throw err;`

Has someone an Idea?

Thanks in advance

Which one should I change in order to read from specific one of 2 MCP3008?

Hi

We’re trying to get an information stuff using pulse sensor.
We use MCP3008, Raspberry Pi 4, Pulse Sensor and mcp-spi-adc.

Our code:

//pulse-sensor.js
const mcpadc = require('mcp-spi-adc');

const pulseSensor = mcpadc.openMcp3008(1, {speedHz: 1350000, busNumber: 0, deviceNumber: 0}, err => {
  console.log("Opened")
  if (err) throw err;

  setInterval(_ => {
    pulseSensor.read((err, reading) => {
      if (err) throw err;

      console.log(reading)
      console.log(reading.value);
    });
  }, 1000);
});

We always get 0

Result:

sudo node pulse-sensor.js
Opened
{ rawValue: 0, value: 0 }
0
{ rawValue: 0, value: 0 }
0

Please help🙏

I'm trying to read analog signals with my Raspberry Pi 4 and Node js, and I'm following the instructions to get your module working

It seems like I'm almost there, but I wonder if you could help me with some final troubleshooting.

I have everything connected the same way as in your diagram, and I've enabled SPI on my Raspberry Pi and restarted it. I have an Express server running on the Pi, and running your sample code in there. It seems to be running fine, and it console.logs out the value every second. In my case, because I'm not using a temperature sensor I took out the math. I just log the raw value and I'll do the math later.

I expect that when I connect the 3.3V rail to pin 5 on the MCP3008, the value that the Pi logs should be 1023, right? But no matter what I try, it always outputs 0. I've tried connecting it to each of the input pins on the MCP one at a time in case I was mistaken about which pin I was using, but it always outputs 0. I also checked that I do have 3.3V on that rail, and it's being supplied to pins 15 and 16. I've double-checked all of the connections too.

One thing that I don't understand is that the Pi doesn't throw an error when I disconnect the MCP from it. I'd have thought that if it couldn't communicate with the MCP it would throw an error?

Do you have any suggestions about what steps I could take to troubleshoot it? I'm very stumped and I can't find any helpful resources about it on the internet. Thanks in advance for any help.

Here is the code I'm running, which is pretty much identical to yours except the math that operates on the value is removed:

const mcpadc = require('mcp-spi-adc');

const sensor = mcpadc.open(0, {speedHz: 20000}, err => {
  if (err) throw err;

  setInterval(_ => {
    sensor.read((err, reading) => {
      if (err) throw err;

      console.log(reading.value);
    });
  }, 1000);
});

Is this normal? I was expecting a value between 0 and 1023. Thank you for this repository!

Hi. I try to read one photocell / sensor with MCP3008. Got this error code:

{ Error: ENOENT, No such file or directory errno: 2, code: 'ENOENT', syscall: 'open' }
/home/pi/tests/1/node_modules/mcp-spi-adc/mcp-spi-adc.js:109
  this._device.transfer(message, function (err, message) {
               ^

Error: EPERM, device closed, operation not permitted
    at AdcChannel.read (/home/pi/tests/1/node_modules/mcp-spi-adc/mcp-spi-adc.js:109:16)
    at Timeout._onTimeout (/home/pi/tests/1/index.js:32:15)
    at ontimeout (timers.js:458:11)
    at tryOnTimeout (timers.js:296:5)
    at Timer.listOnTimeout (timers.js:259:5)

My code:

var PhotoCell = mcpadc.open(5, {speedHz: 20000}, function (err) {
  if (err) console.log(err);

  setInterval(function () {
    PhotoCell.read(function (err, reading) {
      if (err) console.log(err);

      console.log((reading.value * 3.3 - 0.5) * 100);
    });
  }, 1000);
});

Wiring is ok - just like in readme. Node v9.5.0. Need some help please.