P20F04D-12L display with HUB40A interface and 16×8 2R1G1B pixels (part 2)

original article (roumanian language)

by niq_roAfter I became familiar with P20F04D-12L display module using Arduino develelopment board, I decided to made a weather station (temperature & humidity). The first tests we presented in the previous article named P20F04D-12L display with HUB40A interface and 16×8 2R1G1B pixels.

For test I use 2 module and I create a “picture” with 32×8 pixels for clock data (hours and minutes) imagine0aimagine0and a real case is:eP9260170In movie named afisaj 2R1G1B cu interfata HUB40A controlat de Arduino (8) I try different type of  colours and speed animatrions:

Then I made a new “picture” for temperature:imagine1and I create a string with 512 elements (32 columns & 8 rows): imagine1aNow, on my display I see:P9300173After this, I made a new “picture” for humidity:imagine2and a new string with 512 elements:imagine2aNow, on display I see:


I made a new movie, named afisaj 2R1G1B cu interfata HUB40A controlat de Arduino (9)

I made a weather station with AM2302 (DHT22):arduino weather station on P20 2R1G1B HUB40A display schematic

using an original sketch named hub40a_test4m1s1.ino and I made 2 movies:

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9 Responses

  1. Alecu Mihai says:


    Am realizat primele doua montaje cu leduri in forma experimentala, cele cu tranzistori, primul aprinde ledul la lipsa apei si al doilea montaj aprinde ledul in prezenta apei. Am totusi doua nelamuriri.
    Prima este ca eu doresc sa folosesc aceste 2 montaje simultan, in acelasi vas de expansiune in care se afla antigelul unui motor de scuter, tensiunea de lucru fiind intre 12-14.5V. Am fobia asta, sa nu raman fara lichid de racire si sa stric motorul. E destul de scump, desi nu-i deloc un model nou. Inca nu am testat daca functioneaza in antigel( dar ar trebui deoarece contine apa).
    nelamuririle mele sunt: prima, daca cele doua montaje interactioneaza unul cu altul astfel incat sa nu functioneze corect sau mai rau, sa se incinga sau sa se arda. A doua nelamurire provine din faptul ca la un montaj avem un senzor legat direct la “-“(minus), iar la al doilea montaj avem unul din senzori legat direct la “+”(plus). Intrebarea este: exista cumva riscul sa se produca electroliza, fenomen foarte nedorit, producand presiuni in instalatie, incalzirea lichidului, poate si degradarea antigelului. In acest caz, va trebui sa renunt la unul din montaje, desi nu as vrea.
    As dori opinia dvs de specialist, cunostintele mele fiind limitate, sunt maistru de instalatii termice si sanitare.
    Va multumesc frumos.

  2. Alex says:

    Foarte interesant articolul!

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