AVR-Chat

kernels_nz wrote:
> Hi Rob, 
> 
> Wow, I see to be generating a bit of interest with what I viewed as a
> pretty simple problem. Firstly, in practice, every trade-approved
> weigh-scale that ive seen so far has used at least a 24-bit A2D
> converter. The load-cells are completely passive, they are merely a
> wheatstone bridge made up of four strain guages. Thus, to get 10 000
> divisions from a 3mv/v load-cell with 5v excitation (15mv full scale)
> output, you need 15mv / 10000 = 1.5uv resolution in your measurement
> system. In reality im only looking for 3000 divisions (for trade
> approved weighing), but as you stated, I need some head-room.

If the bridge is 15mV FSD, you should amplify it 100 so you get
more resolution.