5V 12864 LCD Display Module 128x64 Dots Graphic Characters Letter Matrix Blue Backlight Compatible with Arduino Copiers Fax Machines Printers 3D Printer

Ecran graphique pour Arduino ça change...

Arrivato con un giorno di anticipo. Scelto per la possibilità di collegarsi con Arduino mediante il protocollo SPI che semplifica notevolmente il cablaggio (solo 3 fili). Inizialmente ho avuto qualche difficoltà perchè nessuno sketch sembrava funzionare ma poi mi sono reso conto che tutto dipendeva dal trimmer VR1 deputato alla regolazione del contrasto. Una veloce messa a punto di questo trimmer e tutto é andato OK. Prodotto consigliato.

Después de mucho investigar pude hacerlo funcionar. Hay que poner un potenciometro de 10K entre masa y 3.3V, y el cursor de este al pin 3, para poder dar contraste y que el interno actúe. Así con sólo 4 cables, más los de alimentación, funciona. Luego usar este código de ejemplo: #include <Arduino.h> #include <U8g2lib.h> #include <avr/dtostrf.h> #include <SPI.h> U8G2_ST7920_128X64_1_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* CS=*/ 10, /* reset=*/ U8X8_PIN_NONE); void setup(void) { u8g2.begin(); u8g2.setContrast(255); // en mi modelo no hace nada u8g2.setPowerSave(1); // en mi modelo no hace nada } uint8_t m = 24; void loop(void) { char m_str[3]; strcpy(m_str, u8x8_u8toa(m, 2)); /* convert m to a string with two digits */ u8g2.firstPage(); do { u8g2.setFont(u8g2_font_logisoso62_tn); u8g2.drawStr(0,63,"9"); u8g2.drawStr(33,63,":"); u8g2.drawStr(50,63,m_str); } while ( u8g2.nextPage() ); delay(1000); m++; if ( m == 60 ) m = 0; }

This display does not function due to having inadequate memory arrangement, you can only display 2 lines of 8 16x16 bit characters, the 128x64 display cannot be used because only half of it is available for display. But it might have some use if all you want to do is display 2 lines of oversized text with maybe a counter. If you need this to experiment or display graphics on a screen the unit is almost completely useless. I've given it 2 stars because the advertising does not properly explain the limitations of this unit but it does have some use if all you want to do is display data but don't want to write it down for display on a piece of paper, which would probably be more interesting.