The values are not always the same when applying the same weight.
Will a scale like this keep a steady measurement without major changes over time?
Thanks for the reply.I already take 30 readings and average them before outputting the data. I didn't think that I needed to play with AREF if I use 5 VDC. Does it help to specify it in programming? Also, as stated above, I am using a low pass filter to help smooth the output. Yours seems to be of the software variety (cool!). Should I use yours instead of or in addition to?The sketch is available if interested.Thanks!
I'm using a transformer to a 7805 regulator to power the circuit, the arduino itself gets power currently from the USB, but will get it from the regulator when I get the networking code done. So power fluctuating shouldn't be an issue. I am concerned with your claim of +/- 1 or 2 bits. That is HUGE. I wanted to avoid and external ADC, but if you are correct, I may have no choice.Thanks for the info.
21.1 Features• 10-bit Resolution• 0.5 LSB Integral Non-linearity• ± 2 LSB Absolute Accuracy• 13 - 260 ?s Conversion Time• Up to 76.9 kSPS (Up to 15 kSPS at Maximum Resolution)• 6 Multiplexed Single Ended Input Channels• 2 Additional Multiplexed Single Ended Input Channels (TQFP and QFN/MLF Package only)• Temperature Sensor Input Channel• Optional Left Adjustment for ADC Result Readout• 0 - VCC ADC Input Voltage Range• Selectable 1.1V ADC Reference Voltage• Free Running or Single Conversion Mode• Interrupt on ADC Conversion Complete• Sleep Mode Noise Canceler
Internal Voltage Reference 1.0 1.1 1.2 V
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