load cell ( 3 KG )

What is it?

A 3KG Load Cell is a sensor used to measure weight or force up to 3 kilograms.It works by converting mechanical force into an electrical signal using strain gauges.

Commonly used in digital weighing scales and DIY electronics projects.

How It Works

The load cell is based on the strain gauge principle:

• When weight is applied the metal beam slightly deforms

• Strain gauges attached to the beam change resistance

• This change produces a very small voltage (millivolts)

• The signal is read using an amplifier like HX711 Load Cell Amplifier

Wiring (Typical 4-Wire Load Cell)

These connect directly to the HX711 module

Working Flow

Weight Applied'Metal Beam Deforms'Strain Gauge Resistance Changes'Small Voltage Generated (mV)HX711 Amplifies Signal'Microcontroller Reads Weight

Key Specifications

• Capacity: 3 kg max

• Output: mV/V (millivolt per volt)

• Accuracy: depends on calibration

• Type: Usually single-point load cell

• Material: Aluminum alloy

Important Characteristics

1. Very Small Output Signal

• Output is in millivolts

• Cannot be read directly by Arduino/p

  • Raw values weight

  • Must calculate calibration factor

   

  3. Sensitive Placement

  • Must be mounted properly for accurate results

  Applications

  • Digital weighing machines

  • Smart carts

  • Robotics force sensing

  • Lab measurements

  • IoT weight monitoring systems

   

  Advantages

  • High accuracy

  • Good repeatability

  • Compact size

  • Low cost

   

  Limitations

  • Requires amplifier (HX711)

  • Sensitive to vibration

  • Needs proper mounting

  • Overloading can damage it

   

  Mounting (Very Important)

  Typical setup:

  • One side fixed (bolul>

    Wrong mounting = incorrect readings

    Example Use

    Digital weighing scale:

    • Place object load cell bends

    • Signal changes

    • HX711 reads data

    • Arduino displays weight

    Practical Tips

    • Do not exceed 3KG limit

    • Use a stable base

    • Calibrate with known weights

    • Avoid sudden shocks

    Load Cell + HX711 Combo

    Real-Life Example

    In a kitchen scale:

    • Load cell detects weight of food

    • HX711 processes signal

    • Microcon