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Weighing scale connection
Is there a way of connecting a weighing scale to rails application and get the weight readings.
That all depends on what connection options the weighing scale provides e.g. Bluetooth, WiFi, etc. You'll need to figure that out first before trying to connect anything to Rails.
What scale are you trying to use?
That is a serial port so you'll first need to use a gem that allows you to interact with serial ports like ruby-serialport. Then if you can use Rails as a way of displaying that information.