ds18b20 issue

[cristina21r]

var sensor = new sensorObj.DS18B20(0);
^
Trying to run this code:

var sensorObj = require('jsupm_ds18b20');

/************** Main code **************/

console.log("Initializing...");

// Instantiate an DS18B20 instance using the default values (uart 0)
var sensor = new sensorObj.DS18B20(0);

console.log("Found", sensor.devicesFound(), "device(s)");
console.log("");

if (!sensor.devicesFound())
{
process.exit(1);
}

// update and print available values every 2 seconds
setInterval(function()
{
// update our values for all of the detected sensors
sensor.update(-1);

// we show both C and F for temperature for the sensors
for (var i=0; i<sensor.devicesFound(); i++)
{
    console.log("Device:", i, "Temperature:", sensor.getTemperature(i),
                "C /", sensor.getTemperature(i, true), "F");
}

console.log();

}, 2000);

process.on('SIGINT', function()
{
sensor = null;
sensorObj.cleanUp();
sensorObj = null;
console.log("Exiting...");
process.exit(0);
});

And i get this error:

Error: Illegal arguments for construction of _exports_DS18B20
at Error (native)
at Object. (/server/ds18.js:9:14)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Function.Module.runMain (module.js:441:10)
at startup (node.js:139:18)
at node.js:968:3

Some help??

[Propanu]

Hi @cristina21r, you need to use an external circuit with the ds18b20 sensor and it only works on UART pins. There's a handy diagram in our known limitations section and you might find some additional details here: #421.

[Propanu]

Were you able to get it to work?

[cristina21r]

No..still no luck

[cristina21r]

and I tried what you told me

[Propanu]

What board are you trying this on, do you get any error messages from MRAA in the system log (journalctl)?