Automated check weighing system based on PIC microcontroller

Non in motion weighing has applications in most of production based industries. Usually a packages travelling on a conveyor are measured for its weights and non acceptable packages are detected as over weight and under weight. The system discussed here will only differentiate packages as correct weight and incorrect weight, where incorrect weight includes both under weight and over weight packages. This system is based on PIC microcontroller and uses readily available static weighing scale to measure weight. Pneumatic cylinders are used as actuators to handle packages.

Introduction
Proposed system
System Hardware
Software design
Software flowcharts
Practical Aspects and Potential Implementation Issues
Discussion
Schematic Diagram
PIC Assembly code listing
PIC Assembly code listing - macros and functions