One of the four load cells had a built in micro switch (auto on/off function). You will recognise it as it has four wires going to it. Cut them off and terminate your own micro switch.
I believe error is gained by the leverage ratio. 4:1 means it has 4x more error. Before pretend it was 1lb off at 200 that is 0.5%, times 4 = 2% with this unit assuming it's full scale error.
Hi Mate great work I have be trying to work out how to do this myself without spending hundreds. Just one question how do you work out the length of the lever? Thanks again for making this video! 👍
Consider the rod as a multiplier or devider. In other words, if you make one side of the rod/lever ten times longer than the other (eg: 1cm x 10cm) your reading will be ten times less than your actual weight. ie: 100kg will read as 10kg. Hope it makes sense.
@@charlescarter9270 it would be beneficial to double check but theoretically if you devide the fulcrum into 10 your reading should be accurate (devided by 10 of course).
oh that's cool, I have never seen inside a digital one only the old ones with a big spring. Don't you need 4 though? or can you just weigh each "corner" and add them together?
It would be preferable to have four scales but you can weigh each corner separately as long as the opposite wheel is standing at the same height as the one you're measuring. Theoretically you only need to weigh one front and one rear side then multiply it by two but I have found some differences in weight between left and right.
Does your on/off switch over ride the auto on/off function? If so, can you provide detail on what terminals to solder to? Thanks.
One of the four load cells had a built in micro switch (auto on/off function). You will recognise it as it has four wires going to it. Cut them off and terminate your own micro switch.
How accurate is it? For example, if you put different weights on it, that were measured before by another scale, what's the difference?
I believe error is gained by the leverage ratio. 4:1 means it has 4x more error. Before pretend it was 1lb off at 200 that is 0.5%, times 4 = 2% with this unit assuming it's full scale error.
Hi Mate great work I have be trying to work out how to do this myself without spending hundreds. Just one question how do you work out the length of the lever?
Thanks again for making this video! 👍
Consider the rod as a multiplier or devider. In other words, if you make one side of the rod/lever ten times longer than the other (eg: 1cm x 10cm) your reading will be ten times less than your actual weight. ie: 100kg will read as 10kg.
Hope it makes sense.
Thanks mate👍
@@BroughBuiltso you would need a known weight to calibrate, correct?
@@charlescarter9270 it would be beneficial to double check but theoretically if you devide the fulcrum into 10 your reading should be accurate (devided by 10 of course).
Hi what a great build i just cannot get my head around how the 10x ratio works did you have a set of drawings/sketch of what ypu did
Barry
Hi Barry. Had couple people ask the same question so I made a short video to explain. Hope it helps! ruclips.net/user/shortsjBpo7crRWXE
oh that's cool, I have never seen inside a digital one only the old ones with a big spring. Don't you need 4 though? or can you just weigh each "corner" and add them together?
It would be preferable to have four scales but you can weigh each corner separately as long as the opposite wheel is standing at the same height as the one you're measuring. Theoretically you only need to weigh one front and one rear side then multiply it by two but I have found some differences in weight between left and right.
Brilliant idea but may have been over budget in materials.
Lekker bru 🙂
Nice idee! Mis jou gepraat however:-)
Thanks man! Ja ek dink nie ek sal weer 'n silent movie maak nie😜