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How can I make an electronic balance that would output a voltage and light a series of LEDs? Answered

The display will be used to represent weight (weight would be between 1 and 100 lbs) and will be used in a competition in which coins will be added into buckets setting on the scales or load cell platforms at varying rates. I will make two identical units and would like for the displays to remain active throughout the competition which should last less than 20 minutes. The purpose will be to represent which bucket has the most weight at any given moment and the accuracy only needs to be the same for each device. In other words, if the buckets were switched, the results would be repeatable (accurate within one LED (or perhaps a better light arrangement may be suggested)).

Thank you

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lemonie

7 years ago


Could you funnel the coins to trip a switch? That way you'd be able to count all the coins.

L

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benglish777lemonie

Answer 7 years ago

Thank you for the idea. Kind of you to respond.

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lemoniebenglish777

Answer 7 years ago


I'm thinking of a big funnel with a small trap-door linked to a micro-switch. You'd need a counter & display (electronics kits)

L

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steveastrouk

7 years ago

First find your load cell. Bathroom scales ?

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benglish777steveastrouk

Answer 7 years ago

That is a good thought. I will look into the bathroom scale idea. I imagine several of the newer scale models us load cells.

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frollardsteveastrouk

Answer 7 years ago

Seconded.

The load cell will output a voltage based on the force applied. It may take some calibration to get it spot on for accuracy.

Then take that signal, feed it (likely) into a computer, likely a microcontroller, and use that to drive your favourite led display.

Each portion of the above has been detailed rather well in several instructables.

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benglish777frollard

Answer 7 years ago

Thanks. I am not sure I know enough about the computer to make use of it but you are probably right on with the microcomputer idea.