This is the Linux app named ArdWeighno whose latest release can be downloaded as Ardweighno.zip. It can be run online in the free hosting provider OnWorks for workstations.
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ArdWeighno
DESCRIPTION:
A load cell bridge can be driven by two Arduino Nano outputs configured as an H bridge. An AC coupled op-amp amplifier is used to amplify the signal and synchronous detection used to measure the signal.
Timer 2 is used to drive the bridge and timer 0 is used to trigger the analog to digital converter.
The hardware consists of a Nano, a single general purpose op-amp, a feedback resistor, coupling capacitor, compensation capacitor and bypass capacitor.
Measurement speed is 122 Hz with four measurements per cycle. 512 measurements are averaged resulting in a stable and precise output.
A more complex version using a chopper input and a six wire connection is also shown. This version should be more stable and precise and requires only a few more resistors and two H11F1M analog switches. These switches are near ideal with no charge injection and optical isolation and are ideal for measuring microvolt level signals.
Features
- Ultra simple, low cost Arduino load cell interface.
- Uses a single commodity CMOS op-amp.
- USB powered.
- High precision relative to it's simplicity and fast measurement speed.
This is an application that can also be fetched from https://sourceforge.net/projects/ardweighno/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.