Electronic Redesign of an Industrial Lift

This project, realized at the company ABER Ltd, describes the process followed for the developing of an electronic control system for a hydraulic elevator. The previous control system was based on relay logic, and the company wanted to change it to a microcontroller based technology. To do so, different approaches were studied and finally the selected technology for the development was the Raspberry Pi. After, the software needed for all the elevator types was developed, and the interface hardware was selected. In the end, several test were made to adjust the software and the hardware and to prove the good operation of the system.

Using a prioritized MAC protocol to execute the database operation join in networked embedded computer systems

Database query languages on relations (for example SQL) make it possible to join two relations. This operation is very common in desktop/server database systems but unfortunately query processing systems in networked embedded computer systems currently do not support this operation; specifically, the query processing systems TAG, TinyDB, Cougar do not support this. We show how a prioritized medium access control (MAC) protocol can be used to efficiently execute the database operation join for networked embedded computer systems where all computer nodes are in a single broadcast domain.