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Weight sensor 0 - 1Kg + HX711 load cell amplifier, Gravity

WEIGHT-SENSOR-1Kg

Weight / Force sensor

  • 0 to 1 Kg
  • HX711 amplifier - amplifier for load cell
  • Gravity interface
  • SEN0160

More details

In stock

17,44 € tax incl.

Description

Force / load sensor to measure weight from 0 to 1 Kg - Load cell and HX711 cell amplifier

The HX711 integrated circuit also called "Load Cell Amplifier" is used to measure a load cell and, therefore, to measure a weight. By connecting the amplifier to a microcontroller, it is then possible to read the resistance of the load cell. Note that a calibration process is necessary to be able to make very precise weight measurements.

The load cells + amplifier are really very practical for creating your own scales, process control or simple presence detector.

The HX711 uses a two wire interface to transmit the data and clock signal (clock/sck and data/dout) to communicate with any microcontroller. Many libraries exist on the Internet, which makes it very easy to read data from the HX711.

A load cell uses a 4-wire H-Bridge heatstone (Wikipedia, english version), which wires are connected to the HX711 amplifier. These wires follow a standardized color code to facilitate connections Red (RED), Black (BLK), White (WHT), Green (GRN). Colors which, in the case of a load cell, follow a coding convention:

  • Red (Excitation+ or VCC)
  • Black (Excitation- or GND)
  • White (Amplifier+, Signal+ or Output+)
  • Green (A-, S- or O-)
  • Yellow (When present. Mass)

If the HX711 module works with a voltage of 2.7 to 5V, the load cell does not!
This requires an excitation voltage of 5 to 15V. Therefore, this board must absolutely be supplied with 5V and therefore only suitable for 5V microcontrollers like an Arduino UNO.

For use with 3.3V microcontroller, a logic level converter must be used for the data signals.

Technical details

HX711 specifications

  • Analog to Digital converter
  • Two selectable differential input channels
  • On-chip active low noise PGA with selectable gain of 32, 64 and 128
  • On-chip power supply regulator for load-cell and ADC analog power supply
  • On-chip oscillator requiring no external component with optional external crystal
  • On-chip power-on-rest
  • Simple digital control and serial interface: pin-driven controls, no programming needed
  • Selectable 10SPS or 80SPS output data rate
  • Simultaneous 50 and 60Hz supply rejection
  • Supply Voltage: 2.6V~5.5V
  • Current: < 1.6mA
  • Working temperature: -40~85°C
  • 16 pin SOP-16 package

Load cell

  • Range:1kg
  • Excitation voltage: 5-15 V
  • Output sensitivity: 1.0 +/- 0.15mV/V
  • Synthetical error: 1 per thousand cent of full scale
  • Zero shift: 0.05/0.03 (30min)%F.S
  • Zero temperature shift: 0.05/0.03 %F.S/10°C
  • Zero output: +/- 0.1mV/V
  • Input impedance: 1055 +/- 15 Ohms
  • Output impedance: 1000 +/- 5 Ohms
  • Overload capability: 200 %F.S
  • Output: Analog output
  • Size: 33mm x 38mm

Mechanical assemblies

The weight sensor is not reversible!
Please, follow the assembly indication (positionning, screwing, arrow) with care!

Capteur de pesage - montage mécanique
An arrow do indicate the side of the sensor where the weight must be applied and the direction to the force to be applied by the weight.

Tutorial

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