Design of Multipoint Weighing in Three- Dimensional Object Center of Mass Measurement System Based on Raspberry pi Nuryanti (a*), Afaf Fadhil Rifa^i (a), Mochamad Rivaldo (a)
Department of Manufacturing Automation and Mechatronics
Engineering Bandung Manufacturing Polytechnic
Bandung, West Java, Indonesia
*nuryanti[at]ae.polman-bandung.ac.id
Abstract
Electric motorcycles have a very simple machine
construction consisting of a battery, controller and drive motor.
The placement of these components affects the center of mass,
where all the weight of the motor is centered in one meeting
point or motor weight point. The problem of determining the
position of the center of mass when converting a fuel motor to an
electric motor is one of the things that must be resolved. To solve
these problems, a center of mass measurement system is made
using the multipoint weighing method with 4 load cell sensors,
the center of mass of an object can be determined by placing the
measuring platform under the object to be measured and the
position of the center of mass is obtained from the difference in
mass measurements at the four load cell points. Sensor reading
data is sent to raspberry pi from Arduino nano using serial
communication and measurement results are displayed using
Node-Red as a user interface. The Mass Center Measurement
System was successfully implemented with the multipoint
weighing method. The best position for mass measurement by
varying the nominal load at the same interval is in the center of
the platform with a percentage error rate of 0.00% and a
repeatability value of 0.002. The results of testing the center of
mass with validated objects obtained the percentage level of
error of the measuring instrument below the permissible error
limit of 10% and the percentage of success of measuring the
center of mass of 95.39%. The measurement results of the motor
center of mass before and after conversion obtained the
deviation value of the center of mass based on the x coordinate
of 2.24 cm, based on the y coordinate of 2.34 cm, and the height
of the center of mass has a deviation of 1.53 cm. The position of
the motor center of mass after conversion isstill within the ideal
area
Keywords: Center of Mass, Multipoint Weighing, Load Cell, Raspberry Pi, Arduino
