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Alcoolmetru realizat cu Arduino Leonardo

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Utilizând un Arduino, un senzor MQ-3, un LCD shield 16×2 și trei leduri brick de culori diferite se poate construi un alcoolmetru hobby foarte rapid.

Senzorul MQ-3 are o sensibilitate ridicată, un timp de răspuns rapid și este sensibil la vaporii de alcool care provin de la o sursa din vecinătate. Se alimentează în curent continuu de la o sursa de tensiune de 5V și scoate la ieșire un semnal analogic raportat la concentrația alcoolului.

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Datele privind nivelul de alcool în aerul expirat vor fi afișate pe un LCD având 2 linii și 16 coloane. Ledurile vor indica 3 nivele prestabilite de concentrație astfel pentru o concentrație mică se va aprinde doar ledul verde, pentru o concentrație moderată se vor aprinde ledurile verde și galben iar pentru o concentrație mare se vor aprinde toate cele 3 leduri.

Alcoolmetru realizat Arduino Leonardo Utilizând un Arduino senzor MQ-3

Trebuie să iți spun de la început sa nu te aștepți să obții o concentrație în procente a nivelului de alcool, acest lucru este destul de complicat de realizat, și necesita condiții de calibrare într-un laborator specializat. NU folosi acest alcoolmetru hobby pentru situații în care poți pune vieți în pericol ! Și NU conduce sub influenta băuturilor alcoolice !

OK, acum ca am trecut de partea avertizărilor obligatorii, să trecem la treabă.

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Componentele necesare:

  • Arduino UNO;
  • un LCD shield 16×2;
  • 3 LED-uri brick;
  • Stabilizator 5V brick;
  • un Senzor MQ-3;
  • Sursa de alimentare externă.

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Cum funcționează?

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conectata prin placa Arduino Platforma Arduino se alimentează

Platforma Arduino se alimentează de la o sursă de tensiune externă. Ieșirea VIN (care este conectata prin placa Arduino la intrarea sursei de tensiune externa) a platformei se conectează la intrarea stabilizatorului 5V brick. Stabilizatorul primește la intrare tensiunea de 7.5 V – 9 V și scoate la ieșire 5V, alimentând senzorul MQ-3.

Este necesar sa folosești un stabilizator extern pentru ca senzorul de alcool MQ-3 consuma un curent relativ ridicat (conține în interior o rezistenta care se încinge în timpul funcționării), asa ca dacă l-ai conecta direct la pinul 5V Arduino exista șansa sa arzi placa Arduino.

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Conținutul acestui articol este în format PDF pus la dispoziție de specialiștii RoboFun.ro. Pentru a vizualiza apăsați butonul Preview iar pentru a descărca butonul Download.

Alcoolmetru realizat cu Arduino Leonardo

  • Utilizând un Arduino, un senzor MQ-3, un LCD shield și trei leduri brick de culori diferite se poate construi un alcoolmetru hobby foarte rapid. Senzorul MQ-3 are o sensibilitate ridicata, un timp de raspuns rapid si este sensibil la vaporii de alcool care provin de la o sursa din vecinatate. Se alimenteaza in curent continuu de la o sursa de tensiune de 5V si scoate la iesire un semnal analogic raportat la concentratia alcoolului. Datele privind nivelul de alcool in aerul expirat vor fi afisate pe un LCD avand 2 linii si 16 coloane. Ledurile vor indica 3 nivele prestabilite de concentratie astfel pentru o concentratie mica se va aprinde doar ledul verde, pentru o concentratie moderata se vor aprinde ledurile verde si galben iar pentru o concentratie mare se vor aprinde toate cele 3 leduri. Trebuie sa iti spun de la inceput sa nu te astepti sa obtii o concentratie in procente a nivelului de alcool, acest lucru este destul de complicat de realizat, si necesita conditii de calibrare intr-un laborator specializat. NU folosi acest alcoolmetru pentru situatii in care poti pune vieti in pericol ! Si NU conduce sub influenta bauturilor alcoolice ! OK, acum ca am trecut de partea avertizarilor obligatorii, sa trecem la treaba. Componentele necesare: • Arduino UNO http://www.robofun.ro/arduino/arduino_uno_v3 •

    Cum functioneaza?

    Platforma Arduino se alimenteaza de la o sursa de tensiune externa. Iesirea VIN (care este conectata prin placa Arduino la intrarea sursei de tensiune externa) a platformei se conecteaza la intrarea stabilizatorului 5V brick. Stabilizatorul primeste la intrare tensiunea de 7.5 V – 9 V si scoate la iesire 5V, alimentand senzorul MQ-3. Este necesar sa folosesti un stabilizator extern pentru ca senzorul de alcool MQ-3 consuma un curent relativ ridicat (contine in interior o rezistenta care se incinge in timpul functionarii), asa ca daca l-ai conecta direct la pinul 5V Arduino exista sansa sa arzi placa Arduino.

    Citește și:

    https://crisstel.ro/arduino-software-pwm/ https://crisstel.ro/arduino-comparatorul-intern/

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