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Weight measurement to computer input?
Peeps,
I would like to read the output of a strain gauge (measuring weight (0-5kg) in this instance) from a PC as part of a general experiment but not sure what bit does (and maybe limits), what. So, strain gauge (or gauges) connects to a SG amp and that turns the output into volts? Then you could read said volts with say an Arduino and then have a USB interface to PC, effectively streaming the output of the strain gauge in ASCII (numbers) to the PC (and the rest is software etc) . However, I understand the Arduino's only have a 10(12 with a tweak) bit ADC and so with 10 bits I'm only going to get 1024 output values? eg, If that was a 1kg 'scale' then I could read around 1g increments but if it was a 5kg scale then ~5g would be the smallest increment (that may be fine but I am just testing my understanding here). Or is the output of the little eBay strain gauge amps already serial so if it was a 24 bit device (16777216) it would be resolving down to ~1/3000 of a g (mathematically at least) and so would just use the Arduino to turn it into ASCII over a USB interface (no ADC needed)? I know you can buy commercial strain gauge to ASCII over USB devices but they aren't exactly cheap (~£250+). Cheers, T i m |
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