LOAD CELL WITH ADC OUTPUT

DESCRIPTION

PROJECT NAME: LOAD CELL with

PROJECT  DESCRIPTION:

                            A load cell is a transducer that is used to convert a force into electrical signal. The most common use of this sensor is in weighing machine. Every weighing machine which shows weight has a loadcell as sensing element.   This conversion is indirect and happens in two stages. Through a mechanical arrangement, the force being sensed deforms a strain gauge. The strain gauge measures the deformation (strain) as an electrical signal, because the strain changes the effective electrical resistance of the wire. A load cell usually consists of four strain gauges in a Wheatstone bridge configuration. Load cells of one strain gauge (quarter bridge) or two strain gauges (half bridge) are also available. The electrical signal output is typically in the order of a few millivolts and requires amplification by an instrumentation amplifier before it can be used. The output of the transducer is plugged into an algorithm to calculate the force applied to the transducer. Load cells are used in several types of measuring instruments such as weighing scales, universal testing machines.

Features:

  • The HX711 uses a two wire interface (Clock and Data) for communication.
  • Any microcontroller’s GPIO pins will work and numerous libraries have been written making it easy to read data from the HX711.
  • 3.3 to 5V interface compactable to any microcontrollers
  • Sutable for any load values

Specifications:

Parameter

Value

Type

Single Point Load Cell

Total Precision

C3 class

Material

Aluminum Alloy

Surface

Anodized Treatment

Protection

IP65

Suggested Platform Size

350 x 350 mm

Applications

Weighing Scales, Retail, Bench & Counting Scales

Rated Load

40 Kg. Max

Rated Output

2.0mV/V+/- 5%

Zero Balance

+/- 1% Full Scale

Input Resistance

405 +/- 6 Ohm

Output Resistance

350 +/- 3 Ohm

Excitation Voltage

5-12V DC

Nonlinearity

0.017% Full Scale

Hysteresis

0.02% Full Scale

Repeatblity

0.01% Full Scale

Creep(30min)

0.015% Full Scale

Operating Temperature

-20 °C to +65 °C

Temperature Effect on Zero

0.017% Full Scale / 10 °C

Temperature Effect on Span

0.014% Full Scale / 10 °C

Insulation Resistance

5000 Mega Ohm(50V DC)

Safe Overload

150% Full Scale

Ultimate Overload

200% Full Scale

Cable

420mm(3mm dia 4 wire shielding cable)

PIN DETAILS:

Pin

Name

Details

1

Vcc

5V dc supply

2

Data

Data out from HX711

3

Clk

Clock input for HX711

4

Gnd

GND