DESIGN AND CONSTRUCTION OF A DIGITAL WEIGHING MACHINE
Abstract
ABSTRACT
This project is designed to handle a wide range of operating forces with high level of reliability. Hence it is most popular in industrial measurements. Using a careful choice of material and structural configuration, a linear relationship between a dimensional change and measured force can be achieved. The project consists of a load cell sensor to measure static & dynamic forces, signal conditioner to amplify the sensor output to 0-5V logic, ADC, LCD &
controller. The stress developed due to the force on Loading is sensed by the load cell (sensor). The load cell is constructed using strain gauge that measures the force applied to the beam. The wheat stone bridge circuit is most frequently used for strain gauge measurements, because of its outstanding sensitivity. The output voltage of the bridge will be very less according to the strain. Typically in millivolts. This output voltage is amplified by a signal conditioner section. The signal conditioner section has an offset and gain control to calibrate the output voltage according to the load applied. The final output of this section is in 0-5V. This signal is applied to the ADC channel for analog to digital conversion. The digital data is fed to the controller, which reads the data and display the output in the LCD display. The load capacity of the testing material is displayed in the 16 x 2 LCD display. These can be designed for load capacities ranging from 0.1 ton to 150 ton.
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