node-dymo

node-dymo is a Node.js wrapper that reads from a Dymo brand USB scale. The wrapper provides several events as well as methods to read measurements from the scale.

Dependencies

Libusb is included as a submodule. On Linux, you'll need libudev to build libusb. On Ubuntu/Debian: sudo apt-get install build-essential libudev-dev

Windows

Use Zadig to install the WinUSB driver for your USB device. Otherwise you will get LIBUSB_ERROR_NOT_SUPPORTED when attempting to open devices.

Quick Examples

dymo.on('online', function() {
  console.log('scale was connected/powered on'); // ## ounces(/grams);
});

dymo.on('weight-change', function(obj) {
  console.log(obj.value + ' ' + obj.system); // ## ounces(/grams);
});

console.log(dymo.getWeight()); // { value: 10, system: 'grams' }

Methods

node-dymo provides three methods you can call at any time:

connect() Connect to the driver, and if a scale isn't immediately online, establish listeners until it becomes online. This method is required in order to gain access to the below methods and listeners
getWeight() Get the current weight on the scale. Returns an object containing the properties value, and system, with the numerical weight and either ounces or grams respectively
getOverweightStatus() In the event the scale is overweight, this method will return true, otherwise false
getStatus() returns either true or false if a scale is available or not.

Events