Posts: 1
Joined: Fri Mar 06, 2015 9:18 pm

USB Weight scale for Raspberry Pi

Fri Mar 06, 2015 11:16 pm

I've already read through this post and googled with "postal weight scale usb 1g".
http://www.raspberrypi.org/forums/viewt ... 44&t=53437

I'm still looking for weight scales with 1g readibility/precision(the one suggested in the above post is 1oz) that is preferably under 200$ and can read upto 2kgs and sends reading to Raspberry pi over USB. Any suggestions would be appreciated. Thanks!

Posts: 26
Joined: Sat May 19, 2012 9:44 pm

Re: USB Weight scale for Raspberry Pi

Wed Mar 11, 2015 9:57 am

Suggestion: Search ebay for:

And here how to use that one onder linux (But not all the scales use the same communication protocol).
http://coleretailtech.blogspot.nl/2014/ ... cales.html.

here some more clues on how to connect:

Edit: But I see I overlooked your requirement of a 1gr precision scale...

Posts: 1
Joined: Tue Sep 22, 2015 1:58 pm

Re: USB Weight scale for Raspberry Pi

Tue Sep 22, 2015 2:20 pm

I'd recommend getting this scale from Alibaba:
http://www.alibaba.com/product-detail/T ... hZ7UXL&s=p

Then taking out the load cell from it. It will get you the resolution and the capacity you need. You can then take that load cell and put it into an indicator. The load cell will have 4 to 7 wires on it. Two will be Excitation voltage, two will be Signal voltage (these four are guaranteed). The other three will be labeled Sense or Sen and Shield. Hook it up to a cheap indicator. Anything with RS-232 output. Then you get a USB to Serial converter for about $20. The indicator will output a string with the information from the scale depending on how you set it up.

I work for a scale company and do this on the regular. It's not hard at all and requires very little deep programming. If you need any help, let me know!

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