The amplifier gain can be adjusted to a value of 64 of 128 via the GAIN jumper on the module (see picture below).When reporting the resolution of a sensor, we are really reporting the smallest step size that a chosen interface can report from the sensor in question without seeing bit noise. The Load Cell Nanoshield has an integrated signal amplifier, ideal for use with low-amplitude signals like the ones provided by load cells. Use this configuration when a higher sampling rate is strictly needed – for instance when it's necessary to monitor a fast-changing, highly dynamic system. The 80 samples per second configuration offers a higher speed in exchange for a small degradation in the signal-to-noise ration, reducing the effective resolution. This is the factory default configuration, and is recommended whenever a higher sampling rate is not strictly necessary – when developing a typical weighing scale, for example. The operation with 10 samples per second offers the best performance in terms of noise suppression, thereby resulting in a higher effective output resolution. The choice of which sampling rate to use depends on the type of application for which the module is being used. SPEED jumper used to select the sampling rate
Load cell resolution calculator manual#
The picture below shows the position of the manual jumpers on the top side and the solder jumpers on the bottom side of the board. That enables the connection of up to 15 modules simultaneously to a single microcontroller. Besides those 5 options, the module also features 10 pins that are selectable via solder jumpers on the bottom side of the board (2, 3, 5, 6, 9, A0, A1, A2, A4 and A5).
The Load Cell Nanoshield features a set of jumpers on the top side of the board that allows the manual selection of up to 5 different pins for the chip select function (4, 7, 8, 10 and A3) – the default pin is 8. This way, the microcontroller can choose which module it will communicate with, sending a low-level logic signal (0V) to the chip select pin corresponding to that module when needed. However, to each one of them an exclusive chip select pin is assigned. All the modules connected to the bus share the same clock and data lines. The bus features a clock line (SCK), two data lines (SDI and SDO) and a selection pin called chip select (/CS). An advantage of this interface is the possibility to connect several modules simultaneously using just a few microcontroller pins. The Load Cell Nanoshield communicates with a microcontroller through an SPI communication interface. It is possible to connect up to 15 modules simultaneously to an Arduino, for example.Ĭonnection to an Arduino MEGA (click on the image to enlarge) !Using multiple modules simultaneously The module offers a SPI interface, suitable for connection to a microcontroller using just a few pins. It is ideal for applications where measurement of force, mass, tension or compression is needed.
It includes an integrated amplifier, noise filtering circuit and a high-resolution ADC converter. Using the ADS1230 integrated circuit from Texas Instruments, the module contains all the circuitry required to read a load cell. The Load Cell Nanoshield is a complete solution for high-precision, high-resolution load cell measurement. * e.g.: 1g of resolution with a 100kg and 3 mV/V load cell.
Load cell resolution calculator code#
Sample code including weight measurement.Configurable sampling rate: 10 or 80 SPS.Effective output range of up to 100,000 points *.Use it to measure forces like weight, tension or compression.Complete solution for load cell measurement.
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