I'm working on a relatively small, low power i2c-enabled device for measuring relative force on a load cell.
As a quick test I've got one of those cheap kitchen scales and hooked up the load cell via an ADS1100 to a Raspberry Pi. Vdd is 3.3v.
It works but I'm only getting about 3 bits of resolution instead of something in the range of 10+ bit.
I'm kind of stuck here as it seems to be an analogue amplification problem which unfortunately is beyond my rather basic electronics skills...
Can anyone give me a hint what kind of circuitry could be added to make this work?
ADS1100: http://www.ti.com/lit/ds/symlink/ads1100.pdf
Load-cell: http://www.manyyear.com/Weighing/Weighing_scale_sensor/handle scale load cell MLC611N.html
As a quick test I've got one of those cheap kitchen scales and hooked up the load cell via an ADS1100 to a Raspberry Pi. Vdd is 3.3v.
It works but I'm only getting about 3 bits of resolution instead of something in the range of 10+ bit.
I'm kind of stuck here as it seems to be an analogue amplification problem which unfortunately is beyond my rather basic electronics skills...
Can anyone give me a hint what kind of circuitry could be added to make this work?
ADS1100: http://www.ti.com/lit/ds/symlink/ads1100.pdf
Load-cell: http://www.manyyear.com/Weighing/Weighing_scale_sensor/handle scale load cell MLC611N.html