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djvas

Afisaj 2x4 ( sau 5) digiti de la colegul SMG

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Am primit niste afisaje de la colegul @smg_1967  si m-am gandit sa fac reverse engineering la schema.

Practic sunt 2 randuri de afisaje cu 7 segmente , fiecare rand fiind populat cu 4 bucati dar se poate adauga si cel de al cincilea daca este necesar.  Pe schema Digit 1 este LSB iar digit 5 nepopulat MSB

Comananda se face serial , pe placi sunt 2 x 4094 shift register cascadate dupa cum se vede in schema. Deci este necesar un cuvant(stream de date ) de 16 biti.  Se poate face usor un voltmetru / ampermetru cu aceste placi.

Daca cineva este interesat pot pune un mic exemplu de cod pentru controlarea lor desi... nu cred ca este vreun programator care nu stie sa comande un shift register si sa faca o multiplexare.

Exista tot la acest coleg si o varianta mai mare cu 3 randuri x 5afisaje. Daca exista interes pot scoate schema si la aceasta.

 

20210422-194603.jpg

sch.png

 

 

afisaj2x4_smg67.pdf

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