ADS1115 and javascript

[Kimlorentz]

How do I write commands to ads1115 and read data?

How to set: SPS = 32 PGA = 2/3 *DIFF0_1

After setup how do I ask for DIFF0_1 data

[Propanu]

The base ADS1x15 class provides all the functionality you need. You can set the sample rate with the setSPS() function and the gain with setGain(). In your case you would use:

setSPS(32)
setGain(GAIN_TWOTHIRDS)

After setting it up you can get the data with getSample() which returns DIFF_0_1 data by default. For further details please refer to the javascript API page for the ADS1x15 module.

[Kimlorentz]

I tryed this code.

var mraa = require('mraa');
var version = mraa.getVersion();

if (version >= 'v0.6.1') {
    console.log('mraa version (' + version + ') ok');
}
else {
    console.log('mraa version(' + version + ') is old - this code may not work');
}

// Instantiate on I2C bus
var ADS1X15 = require('jsupm_ads1x15');
var ads1115 = new ADS1X15.ADS1115(1, 0x48); 
ads1115.setSPS(32);
ads1115.setGain(GAIN_TWOTHIRDS);

setInterval(function(){

    console.log("*********************");
    console.log("Sample: " + ads1115.getSample()); // Read DIFF 0-1
    console.log("Gain: " + ads1115.getGain());
    console.log("SPS: " + ads1115.getSPS());
    console.log("*********************");

}, 1000); 

Only got this error:

Upload Complete 
mraa version (v0.9.4) ok  

ERROR: /home/root/.node_app_slot/main.js:15 
ERROR: ads1115.setGain(GAIN_TWOTHIRDS);
    ERROR:             ^
ERROR: ReferenceError: GAIN_TWOTHIRDS is not defined
    at Object.<anonymous> (/home/root/.node_app_slot/main.js:15:17)    
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10) 
    at startup (node.js:119:16)
    at node.js:935:3

[yannickadam]

I don't have this device so I can't really try it. However, GAIN_TWOTHIRDS is not defined on the global scope. You probably need to use something like ADS1X15.GAIN_TWOTHIRDS

[Propanu]

Yeah, the enum is nested in the class, try ADS1X15.ADS115.GAIN_TWOTHIRDS, and for SPS it should be ADS1X15.ADS115.SPS_32.

[Propanu]

Considered solved.