Digital sensor based on timer for embedded systems / Sensor digital baseado em temporizador para sistemas embarcados

Letícia Vieira Guimarães, Celso Maciel da Costa, Alleff Dymytry, Gabrieli M. de Melo

Abstract


Embedded instrumentation needs analog sensors relating to a physical measurement that must be converted to a digital signal (ADC). Most microprocessors feature built-in AD converters, but there are some that do not. In this work, we analyze a digital sensor based on a timer circuit. The timer circuit functions as a signal conditioner using resistive and / or capacitive elements, where an element becomes the sensor, causing a pulse proportional to a physical quantity to be measured. The sampling signal is sent, initiating the process. In order to check the performance of the circuit, some experiments were performed and the results showed that it is a very simple solution for an unavailability of an AD-Converter.

 

 


Keywords


Embedded instrumentation, AD-Converter, Digital Sensor based on Timer.

Full Text:

PDF

References


F. M. Cady Microcontrollers and Microcomputers principles of software and hardware engineering, Oxford University Press, New York, 1997.

555 Timer as an A/D converter. http://bobblick.com/techref/projects/a2d555/a2d555.html.

555 Based Digital Voltmeter, https://undergroundworkbench.wordpress.com/2011/02/21/555-based-digital-voltmeter/

RASPBERRY PI FOUNDATION, RASPBERRY PI DOCUMENTATION, https://www.raspberrypi.org/documentation/

What is Arduino? https://www.arduino.cc/en/Guide/Introduction

The History of 555 Timer IC – Story of Invention by Hans Camenzind - July 5, 2017, http://www.circuitstoday.com/the-history-555-timer-ic




DOI: https://doi.org/10.34117/bjdv7n10-068

Refbacks

  • There are currently no refbacks.