Weighing scale singapore

Digital ADC circuit module for Wheatstone Bridge sensor.This load cell circuit module connects to a load cell sensor and provides a digital sensed value for a microcontroller to process. This circuit is also suitable for many other sensors which are of Wheatstone bridge designed. It is an ADC (analogue to digital converter) for Wheatstone bridge sensors.

A load cell is typically a Wheatstone bridge circuit. Any small change in the resistance (mili-Ohms range) can be measured. This circuit module is able to measure the small change in the resistivity of the load cell with a precision up to digital 24bits. It is able to accept 2 differential input, and selectable gain, converting the analogue sensor signal to digital.

Suitable Sensors and Application

This circuit module is suitable for interfacing to Wheatstone bridge type of sensors. It is widely used for precision measurement of tiny voltage changes from the sensor’s output.

  • Load Cell
  • Strain Gauge
  • Pressure Sensor
  • Light Sensor
  • Digital Weighting Scale

50Kg Load Cell Sensor

Typical load cell 1Kg, 2Kg, 5Kg, 10Kg, 50Kg, 100Kg or 200Kg (±20mV, ±40mV, ±80mV) can all be interfaced to this load cell circuit converting the precision weight pressure sensing into a digital data reading for measurement.

Load Cell Circuit Module Features

The circuit features and specification.

  • 2x differential input channel, A and B
  • Selectable gain x32, x64, x128
  • ADC sampling speed 10Hz, 80Hz
  • Accept input voltage 3.3V to 5V
  • Power consumption < 1.5mA
  • Operating temperature -40℃ to 85℃

Connection from Sensor to Circuit Module

The load cell circuit consists of 6 inputs (E+, E-, A-, A+, B-, B+). It is ok to connect the terminal in the reverse polarity. The Wheatstone bridge (resistive based) sensor will not be damaged. The reading value will be reversed if the terminal is connected with reverse polarity.

Terminal E+ E-

This is the power supply to the load cell sensor or any Wheatstone bridge sensor circuit.

Terminal A+ A-

This is the input terminal of the load cell sensor or any Wheatstone bridge sensor circuit. The gain of terminal A+ A- is selectable between x64 (±40mV) or x128 (±20mV). Default gain is 128.

Terminal B+ B-

This is the input terminal for the 2nd set of load cell sensor or any Wheatstone bridge sensor circuit. The gain of terminal B+ B- is fixed at x32.

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