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Extindere numar intrari analogice


rus_dorin
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Am nevoie de un numar foarte mare de intrari analogice (mai mult de 100) si as vrea sa stiu care ar fi cea mai indicata metoda de extindere: registru deplasare, ADC pe I2C sau alte metode. Bineinteles procesarea datelor(de la senzori ) va fi realizata de un pic. Ms

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Se poate cu multiplexor analogic, de exemplu 74HC4051 care are 8 canale.Daca ai 128 senzori analogici, iti trebuie 16 cipuri dinastea ca sa scoti 16 iesiri analogice, care la randul lor mai intra in 2 cipuri si ies 2 iesiri analogice care intra in 2 intrari ADC la PIC (pentru ca nu merita sa mai irosim inca un cip pentru 2 amarate de intrari :rade: ).Oricum astea-s ieftine, cam 0.5 RON.

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Bineinteles ca da. Fiecare senzor va avea o adresa de la 0 la cati senzori sunt, adresa care va fi trimisa sa zicem de la portul B al PIC-ului ca in imagine, unde am dat un exemplu cu 40 de semzori care vin conectati la intrarile X0-X7 de la cipurile din randul de sus.

 

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