alphacharlie / node-ads1x15 Goto Github PK

// To run this Do the following
//
// install modules
// npm install node-ads1x15 --save
//
//
// nodejs i2c.js
//
// Code test on a Pi3 and a AUTOMATION PHAT unit
// https://shop.pimoroni.com/products/automation-phat

var ads1x15 = require('node-ads1x15');
var chip = 0; //0 for ads1015, 1 for ads1115

//Simple usage (default ADS address on pi 2b or 3):
var adc = new ads1x15(chip);

// Optionally i2c address as (chip, address) or (chip, address, i2c_dev)
// So to use /dev/i2c-0 use the line below instead...:

//var adc = new ads1x15(chip, 0x48, '/dev/i2c-1');

var channel = 0; //channel 0, 1, 2, or 3...
var samplesPerSecond = '250'; // see index.js for allowed values for your chip
var progGainAmp = '4096'; // see index.js for allowed values for your chip

var ChData =[]; //somewhere to store values
var dev = 127; // used to change Ch data to Voltage

var Active = "0, 1, 2, 3"; //channels and the order to scan in
// var Active = "0, 1"; // Only ch 0 and 1
// var Active = "1, 3"; // Only ch 1 and 3
var ActiveCh = Active.split(", ") ;
var Count = 0; // Counter in the loop back

function ChannelRead() {
var ch = ActiveCh[Count]; // Getting the ActiveCh number
adc.readADCSingleEnded(ch, progGainAmp, samplesPerSecond, function(err, data) {
if(err){
//logging / troubleshooting code goes here...
throw err;
}
// if you made it here, then the data object contains your reading!
ChData[ch] = data // Putting data into

// Checking the Loop
if (Count == (ActiveCh.length - 1)) {// Checking if is the last change 
     Count = 0; // Reset the counter and do NOT call ChannelRead 
 // Output the Voltages
     console.log ('CH1: ' + (ChData[0]/dev).toFixed(2) +
               '\tCH2: ' + (ChData[1]/dev).toFixed(2) +
               '\tCH3: ' + (ChData[2]/dev).toFixed(2) +
               '\tCH4: ' + (ChData[3]/dev).toFixed(2) );

}else { // going to read the next channel 
     Count++;
     ChannelRead();  // Calling ChannelRead again with Count +1
}
return 1; // need to return to the starting call to TempRead

});
}

if(!adc.busy)
{

// ChannelRead(); // - one Time Read read all 4 ch

// Active = "0, 1, 2, 3";
// OUTPUT
// CH1: 0.03 CH2: 0.03 CH3: 0.03 CH4: 4.60

// Active = "0, 1";
// OUTPUT
// CH1: 0.03 CH2: 0.03 CH3: NaN CH4: NaN

// Active = "1, 3";
// OUTPUT
// CH1: NaN CH2: 0.03 CH3: NaN CH4: 4.57

iv = setInterval(ChannelRead, 500); // Repeat every 500msec
// 100 (every 100msecs or 10 times a sec) is the max with this program
// will do with 4 ch being run each time and the Sample rate (On a pi3).

// OUTPUT
// CH1: 5.15 CH2: 0.03 CH3: 0.03 CH4: 4.60
// CH1: 5.15 CH2: 0.03 CH3: 0.03 CH4: 4.60
// CH1: 0.03 CH2: 0.03 CH3: 0.03 CH4: 4.60
// CH1: 0.03 CH2: 0.03 CH3: 0.03 CH4: 4.60

}

I think you forgot to call callback function in getLastConversionResults function. After 669th line you can add callback(null, data). I add the line however It was returned NaN value. I realized that this.pga is not set in startContinuousConversion function. I solve that problem by passing argument to getLastConversionResults function.

is ads1115
We've got an Error, Lance Constable Carrot!: Error: Cannot write to device
We've got an Error, Lance Constable Carrot!: Error: Error reading length of bytes

And I am getting some wrong reading from respective channel.

This package is just the thing I need for a project I am working on.

When I try to install node-ads1x15 on my raspberry pi 3, the rebuild of node-gyp fails:

pi@smoke-pi:~/work/tools/node-ads1x15 $ npm install node-ads1x15 --save
\

[email protected] install /home/pi/node_modules/node-ads1x15/node_modules/i2c
node-gyp rebuild

make: Entering directory '/home/pi/node_modules/node-ads1x15/node_modules/i2c/build'
CXX(target) Release/obj.target/i2c/src/i2c.o
../src/i2c.cc: In function ‘void ReadBlock(const v8::FunctionCallbackInfov8::Value&)’:
../src/i2c.cc:162:47: error: no matching function for call to ‘New(int32_t&)’
Local buffer = node::Buffer::New(len);
^
../src/i2c.cc:162:47: note: candidates are:
In file included from ../src/i2c.cc:2:0:
/home/pi/.node-gyp/4.4.3/include/node/node_buffer.h:28:40: note: v8::MaybeLocalv8::Object node::Buffer::New(v8::Isolate_, size_t)
NODE_EXTERN v8::MaybeLocalv8::Object New(v8::Isolate_ isolate, size_t length);
^
/home/pi/.node-gyp/4.4.3/include/node/node_buffer.h:28:40: note: candidate expects 2 arguments, 1 provided
/home/pi/.node-gyp/4.4.3/include/node/node_buffer.h:31:40: note: v8::MaybeLocalv8::Object node::Buffer::New(v8::Isolate_, v8::Localv8::String, node::encoding)
NODE_EXTERN v8::MaybeLocalv8::Object New(v8::Isolate_ isolate,
^
/home/pi/.node-gyp/4.4.3/include/node/node_buffer.h:31:40: note: candidate expects 3 arguments, 1 provided
/home/pi/.node-gyp/4.4.3/include/node/node_buffer.h:36:40: note: v8::MaybeLocalv8::Object node::Buffer::New(v8::Isolate_, char_, size_t, node::Buffer::FreeCallback, void_)
NODE_EXTERN v8::MaybeLocalv8::Object New(v8::Isolate_ isolate,
^
/home/pi/.node-gyp/4.4.3/include/node/node_buffer.h:36:40: note: candidate expects 5 arguments, 1 provided
/home/pi/.node-gyp/4.4.3/include/node/node_buffer.h:43:40: note: v8::MaybeLocalv8::Object node::Buffer::New(v8::Isolate_, char_, size_t)
NODE_EXTERN v8::MaybeLocalv8::Object New(v8::Isolate* isolate,
^
/home/pi/.node-gyp/4.4.3/include/node/node_buffer.h:43:40: note: candidate expects 3 arguments, 1 provided
i2c.target.mk:86: recipe for target 'Release/obj.target/i2c/src/i2c.o' failed
make: *** [Release/obj.target/i2c/src/i2c.o] Error 1
make: Leaving directory '/home/pi/node_modules/node-ads1x15/node_modules/i2c/build'
gyp ERR! build error
gyp ERR! stack Error: make failed with exit code: 2
gyp ERR! stack at ChildProcess.onExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/build.js:276:23)
gyp ERR! stack at emitTwo (events.js:87:13)
gyp ERR! stack at ChildProcess.emit (events.js:172:7)
gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:200:12)
gyp ERR! System Linux 4.4.9-v7+
gyp ERR! command "/usr/local/bin/node" "/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /home/pi/node_modules/node-ads1x15/node_modules/i2c
gyp ERR! node -v v4.4.3
gyp ERR! node-gyp -v v3.3.1
gyp ERR! not ok
npm ERR! Linux 4.4.9-v7+
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "node-ads1x15" "--save"
npm ERR! node v4.4.3
npm ERR! npm v2.15.1
npm ERR! code ELIFECYCLE

npm ERR! [email protected] install: node-gyp rebuild
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] install script 'node-gyp rebuild'.
npm ERR! This is most likely a problem with the i2c package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node-gyp rebuild
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs i2c
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!
npm ERR! npm owner ls i2c
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! /home/pi/work/tools/node-ads1x15/npm-debug.log
pi@smoke-pi:~/work/tools/node-ads1

When I run your sample program, on every call to adc.readADCSingleEnded() it will echo out is ads1115 to STDOUT. Why is this, and how do I disable it?

Looks like it may be coming from node-i2c however not 100% sure.

Thank you for creating this library! Could you please add an explicit LICENSE file to the repo so that it's clear under what terms the content is provided, and under what terms user contributions are licensed?

Per GitHub docs on licensing:

Generally speaking, the absence of a license means that the default copyright laws apply. This means that you retain all rights to your source code and that nobody else may reproduce, distribute, or create derivative works from your work. This might not be what you intend.

Thanks!

The example code you have on the main page is missing } at the end. And you get the following error
/home/user/node/i2c/example.js:29
);
^

SyntaxError: Unexpected token )
at createScript (vm.js:80:10)
at Object.runInThisContext (vm.js:139:10)
at Module._compile (module.js:599:28)
at Object.Module._extensions..js (module.js:646:10)
at Module.load (module.js:554:32)
at tryModuleLoad (module.js:497:12)
at Function.Module._load (module.js:489:3)
at Function.Module.runMain (module.js:676:10)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3

i.e. change it to this at the bottom
if(!adc.busy)
{
adc.readADCSingleEnded(channel, progGainAmp, samplesPerSecond, function(err, data) {
if(err)
{
//logging / troubleshooting code goes here...
throw err;
}
// if you made it here, then the data object contains your reading!
reading = data;
// any other data processing code goes here...
);
}
}

We are using the function "readADCDifferential()" (supposing it happens with others too) with our ads1115 chip in our product. To customers we are providing an npm environment as software interface so customer can use your code easily. It is working excellent.
For us it is obligatory to perform EMC tests to the analog inputs we connected to the ADS chip before we release a final product. During the EMC tests it happens that the I2C bus is disturbed as well and the communication across I2C may get interrupted.

This is why the readADCDifferential() function from time to time returns the error "We've got an Error, Lance Constable Carrot!: Error: Cannot write to device"

self.wire.writeBytes(ADS1015_REG_POINTER_CONFIG, bytes, function(err) {
      if(err)
      {
        self.busy = false;
        callback("We've got an Error, Lance Constable Carrot!: " + err.toString());
      }
    });

This is also fine so far ... but now comes the problem: even if the error was reported in the callback (and the write over I2C was not executed) the readADCDifferential() function continues to setup another I2C command "self.wire.readBytes()" in a setTimeout() function and finally we got another callback(null, data);
So with a single call to "readADCDifferential()", we receive two callbacks which is not ok. Also we are wondering which "data" is provided in the second callback if the previous write command failed.
Should be corrected. In case of a write failed a following read should never be executed.

I've ran your example code and no matter the selected pin by me, if I've select pin A0 and connects the A3 pin on board, the output seems like I've connects the right pin.

I'm trying to install ads-1x15 on an raspberry pi .
node version: v10.16.1
npm version: 6.9.0
uname -m : armv6l

i2c is failing. I went to the i2c GitHub and there is an issue that is resolved with npm install @abandonware/i2c.
I installed this version. How do I tell npm to use it with npm install ads-1x15?

I am trying to use node-ads1x15 on the CHIP (http://www.getchip.com) and CHIP has multiple I2C buses. The one we want to use is /dev/i2c-2. This issue requests the exposure of the parameter that defines the bus on which the device can be found.

the check for pgaADS1x15["6144"] fails even if "6144" is a valid pga cause resulting value equals to zero = ADS1015_REG_CONFIG_PGA_6_144V = 0x0000

I tried your library for raspberry pi and ads1115. But when run I get error failed to set address for line wire.setAddress(address); in i2c.coffee file. I have attach code file and error
code file:

error file:

The version in the npm repository is still 1.0.0

// To run this do the following
//
// install modules
// npm install node-ads1x15 --save
//
//
// nodejs i2c.js
//
// Code test on a Pi3 and a AUTOMATION PHAT unit
// https://shop.pimoroni.com/products/automation-phat

var ads1x15 = require('node-ads1x15');
var chip = 0; //0 for ads1015, 1 for ads1115

//Simple usage (default ADS address on pi 2b or 3):
var adc = new ads1x15(chip);

// Optionally i2c address as (chip, address) or (chip, address, i2c_dev)
// So to use /dev/i2c-0 use the line below instead...:

//var adc = new ads1x15(chip, 0x48, '/dev/i2c-1');

var channel = 0; //channel 0, 1, 2, or 3...
var samplesPerSecond = '250'; // see index.js for allowed values for your chip
var progGainAmp = '4096'; // see index.js for allowed values for your chip

var ChData =[]; //somewhere to store our reading
var dev = 127; // used to change Ch data to Voltage

// Reading the ch data
var ReadCh = function(ch, callback){
adc.readADCSingleEnded(ch, progGainAmp, samplesPerSecond, function(err, data) {
if(err){
//logging / troubleshooting code goes here...
throw err;
}
// if you made it here, then the data object contains your reading!
ChData[ch] = data // Putting data into

//console.log ('channel  ' + ch + ': ' + data);
// Calling the next ch or done
callback();

});
}

// A way to make the reads run one after the other with callbacks
var Readchall = function(){ReadCh(0, Readch1)};
var Readch1 = function(){ReadCh(1, Readch2)};
var Readch2 = function(){ReadCh(2, Readch3)};
var Readch3 = function(){ReadCh(3, ChDone)};
var ChDone = function(){
// This is run after the 4 ch have been read
console.log ('CH1: ' + (ChData[0]/dev).toFixed(2) +
'\tCH2: ' + (ChData[1]/dev).toFixed(2) +
'\tCH3: ' + (ChData[2]/dev).toFixed(2) +
'\tCH4: ' + (ChData[3]/dev).toFixed(2) );
};

if(!adc.busy)
{

// Readchall(); // - one Time Read read all 4 ch

// OUTPUT
// CH1: 0.03 CH2: 0.03 CH3: 0.03 CH4: 4.60

iv = setInterval(Readchall, 500); // Repeat every 500msec
// 100 (every 100msecs or 10 times a sec) is the max with this program
// will do with 4 ch being run each time and the Sample rate (On a pi3).

// OUTPUT
// CH1: 5.15 CH2: 0.03 CH3: 0.03 CH4: 4.60
// CH1: 5.15 CH2: 0.03 CH3: 0.03 CH4: 4.60
// CH1: 0.03 CH2: 0.03 CH3: 0.03 CH4: 4.60
// CH1: 0.03 CH2: 0.03 CH3: 0.03 CH4: 4.60

}

I found strange behaviour of readADCSingleEnded, which produces random result sometimes. After I tried to increase the delay, about 10ms, random results didn't appear anymore. Could you please evaluate the formula which calculates the amount of delay for readADCSingleEnded function? Just curious, maybe it didn't produces proper value.