Electronic (digital) scales. I've given up on them.

[frankski]

No, Streaker could have built something actually functional.

Like John Bigboote would do.

https://www.bing.com/videos/search?q...BAE3&FORM=VIRE

[ExFlyinguy]

Uhh, no.

Damn Amish unibomber. I saw that pic of you and your cabin

[R L Suehr]

Like John Bigboote would do.

https://www.bing.com/videos/search?q...BAE3&FORM=VIRE

Nice, I gotta give credit for a buckaroo bonzai reference.

[streaker69]

I got a working load cell in the mail today, took the slow rickshaw from china to get here.



It's much larger than the dead loadcell behind it, not accurate enough for reloading, but at least it proves that the program and the interface works.



I haven't read through the actual program yet to determine what the numbers mean. I'm guessing that it's actual resistance of the load cell, which would then need to be converted into grams, grains, kilograms or whatever. You can see how the cell changed when I was putting pressure on it.

[streaker69]

I'm not sure if you guys realize the truth when you said "if you breathe on the scale it changes". I've just found the actual reason for that, yes, breathing on the scale actually does change the zero. But it's not the load cell, it's the Op-Amp that's causing it. Just breathing warm air on the op-amp changed the zero significantly.

[frankski]

I'm not sure if you guys realize the truth when you said "if you breathe on the scale it changes". I've just found the actual reason for that, yes, breathing on the scale actually does change the zero. But it's not the load cell, it's the Op-Amp that's causing it. Just breathing warm air on the op-amp changed the zero significantly.

Pecking chickens totally boogered my old scale.

[streaker69]

More progress.


I got the load cell mounted to a block so it actually does function as a scale. The output of the load cell is displayed on the LCD screen and there's a "zero" button. The OP-Amp is definitely temperature sensitive, and it really didn't like starting up in the cold garage, it took a while before it stabilized internally and started giving consistent readings.

[abner13]

My 20yrs old PACT digital scale was going nuts , and driving me the same till I realized I needed to TURN THE CEILING FAN OFF!

[streaker69]

A little more progress today, I figured out the calibration process, right now it's manual, but I'm certain I can make it automatic.



I also added a platform for the weight just so that it's easier to test with. Had to find the right kind of screws for that, I don't have a big selection of metric hardware on hand. The nut and bolt that's on the scale right now weighs 22grams according to another scale I have.

When you guys are weighing in grains, how many decimal places are you measuring?

[Brick]

We're only measuring to the nearest 0.1 gr. I think more precise than that (0.01 or even nearest 0.05) would really be superfluous.