2012 - Europe Direct Iasi

EUROINVENT 2012
interrupt system of the microcontroller; however, this induces
auxiliary errors in the measured intervals. In order to compensate
these errors, the system uses the TtV method for determination of
the time lag between the transitions of the external signal and the
executed subroutines. The microcontroller counts at the hardware
level the rising edges of the digital signal, which gives the
number or events.
Applications:
The time measuring system is suitable for using in:
- Parameter monitoring such as temperature, motors
speed and light intensity.
- Analysis of the electronic circuits behavior;
- Response time measuring of the analogue and digital
systems;
- Nuclear event counting;
1. Distance calculation using ultra-sounds or
electromagnetic waves.
10.5.
Software Package for High-Precision Time Measuring
Title
Using Microcontrollers
Authors Mircea Hulea, Horia-Nicolai Teodorescu
Institution Gheorghe Asachi Technical University of Iasi
Patent no. O.R.D.A. registration number: 14413/25.11.2011
The software package includes an assembler program for
MICROCHIP PIC18FXXX microcontrollers and a MATLAB
program. The microcontroller program performs high-precision
time interval measurement when two analogue signals are within
Description a bi-dimensional amplitude window. This program controls the
interrupts system, the AD converter, the TIMER of the
microcontroller and an external DA converter that sets the limits
of the measuring window. The main parts of the program are the
interrupt subroutines executed at the beginning and at the end of
the measured event that is defined by a digital signal. Thus,
Class 10
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