and buy an HX711 module. You could run it on a wider +/- supply, etc., but you'll never get better than the Arduino's 10bit ADC accuracy.
I misinterpreted the above comment. (also, I didn't look up the HX711 because I didn't have time but after
looking at the datasheet I agree with both of you. It takes the differential input voltage and outputs a 24-bit value , and it runs off 5V instead of a bi-polar supply.
$2.79 from IC Station on a board, just ordered a couple.
http://www.icstation.com/icstation-hx711-weight-sensor-module-p-5251.html
Dear all,
I am new in this comminity and i want your help.
I am trying to create one scale with one arduino Mega and one load cell (CZL - 601 120kg)
I have one ina125P.
the techical data for the load cell are the following
PARAMETERS:
Precision : C2 / C3
Output Resistance(O ) :350±3
Comprehensive Error(%F.S) :
0.03 / 0.02
Insulation Resistance(MO):
≥5000(100VDC)
Rated output(mv/v) : 2.0±0.1
Excitation Voltage(V) : 9～12（DC）
Non-linearity(%F.S) : 0.03 / 0.017
Compensated temp.Range(℃ ) : -10～+40
Hysteresis(%F.S) : 0.03 / 0.02
Use Temp. Range(℃ ) :-35～+65
Repeatability(%F.S) : 0.02 / 0.01
Temp.Effect on Zero(%F.S/10℃) : 0.03 / 0.017
Creep(%F.S/30min) :0.02
Temp.Effect on Span(%F.S/10℃): 0.02 / 0.014
Zero Balance(%F.S) : ±1
Safe Overload (%F.S) : 120
Input Resistance(O) :405±6
Defend Grade: IP65
WIRING SCHEMATIC DIAGRAM:
DIMENSIONS (Unit: mm):
Red: Input ( + ) 111 White: Output ( - )
Black: Input ( - ) 111 Green: Output ( + )
The voltage for the load cell is 9-12 v as i know the arduino has max input the 5v
I thought one solution to put one voltage divider after the signal from the load cell before the arduino
I am asking if someone has any ideas about the above thought.
Thank you for your time
The voltage for the load cell is 9-12 v as i know the arduino has max input the 5v
I thought one solution to put one voltage divider after the signal from the load cell before the arduino
I am asking if someone has any ideas about the above thought.
What's the question ? I think you have the answer with the voltage divider if you are in fact talking about using an analog input to measure a voltage > 5V. I'm not aware of any way to get around that.
The question is if someone has any better idea i tried to find something better and i found the following circuit
and he writes
The INA125 Instrumental Amplifier is powered from the 12v supply, the load cell supply is powered by the INA125s’ built-in 5v regulator. AREF voltage will also be 5v and the analogue voltage range is from Ground to 5V. Other voltage configurations are possible with the INA125 and you may want to refer to the Data Sheet; link at the end of the post.
has anyone tried the above circuit?
