digital weight scale

[eyenierazali]

hello. I want to design an electronic blood donor scale.
I'm having problem in searching full circuit diagram for digital weighing circuit in which can convert weight (g/kg) to volume (ml).

And if possible, is there any coding for PIC microcontroller that convert weight to volume? tQ.

[Ttelmah]

Er.
Provided you have the specific gravity of what you are weighing, it is a simple multiplication/division. Otherwise it is impossible.

With blood, it'll vary with some medical conditions, but is typically 1.0621.
1062.1kg/m^3

Best Wishes

[Mike Walne]

Which quantity (mass or volume), do you actually want?

What signals/data do you have available from existing hardware?

Mike

[asmboy]

Other questions like what resolution, granularity and accuracy do you need?
Those issues come to mind too.

[temtronic]

another Q. How the weighing is done.
Commercial units(some/most/all?) actually compute the volume of blood collected then shut off the flow(google 'electronic blood donor scale').