#U8GLIB PINOUT FOR ARDUINO MEGA SERIAL#
#U8GLIB PINOUT FOR ARDUINO MEGA SOFTWARE#
#U8GLIB PINOUT FOR ARDUINO MEGA SERIES#

SPI is not hardware mapped, i.e., the protocol does not require specific pins of the Arduino. PSB should be connected to GND and the wires to GND, VCC, VD, BLA and BLK supply power to the display breakout and regulate background light and contrast of pixels versus background. Summarized: SPI’s CLK is supported by pin ‘E’ on the display breakout board, data is supported by pin ‘R/W’ and Chip Select by pin ‘CS’.

#U8GLIB PINOUT FOR ARDUINO MEGA SERIAL#

CLK (clock) and CS (chip select) are necessary and so are the data pin (R/W) and the pin marked PSB (the latter needs to be connected to GND – pin set continuously LOW to inform the display’s controller chip that it should work in serial mode (PSB HIGH means parallel mode). MISO and MOSI are necessary for master/slave mode and do not matter in the present construction. While SPI protocols work with pins marked MISO, MOSI, CLK and CS, the ST7920 breakout board has completely different pin designations while it supports the SPI protocol.

#U8GLIB PINOUT FOR ARDUINO MEGA SERIES#

BLA can be connected to the 5V pin of the Arduino with a 220Ω resistor in series to reduce the voltage, or it can be connected directly to the 3.3V pin of the Arduino. PSB is connected to ground, while BLA needs 3.3V (background LED light of the LCD display) and BLK needs connection to GND. The DB0 through DB7 pins of the breakout board need to be connected only if parallel mode is considered.

GND is wired to GND of the Arduino, 5V to 5V, V0 to the wiper of a 10kΩ potentiometer (this is to adapt the contrast between characters or graphics of the LCD against the background), RS to pin 12, R/W to pin 11 and E to pin 13. The LCD display breakout board has 20 pins for connectivity, labeled GND, VCC, V0, RS, R/W, E, DB0, DB1, DB2, DB3, DB4, DB5, DB6, DB7, PSB, NC, RST, VOUT, BLA and BLK.įigure 1 shows the basic connectivity via the SPI interface (SPI stands for Serial Peripheral Interface). Additional: 1x DHT11 temperature/ relative humidity sensor, 1x Dallas DS18B20 temperature sensor, 1 x 10kΩ resistor, 1x 4.7 k10kΩ resistor. The display shows a few of the graphical features offered by the u8g library: triangles, lines, circles, text.ġx Arduino Nano microcontroller board, breadboard, Dupont jumper wires, 128×64 ST 7920 based LCD display breakout board, 1x 10 kΩ potentiometer, 1x 220 Ω resistor. These pins need to be declared in the display constructor part of the sketch. Here, RS is wired to the Nano’s pin 12, R/W to pin 11 and E to pin 13. Only 3 digital pins of the Arduino are required to get output on the display: pins supporting the functions RS, R/W and E. The u8g library written by Oliver Kraus (‘Olikraus’) offers a selection of graphic functions, special characters and text fonts which makes the use of this kind of display extra attractive.įigure 1: Wiring of a graphic 128×64 LCD display, in SPI mode. The screens are in vertical direction twice as big as 20×4 LCD displays so they offer good readability. This modest ‘pin requirement’ makes the ST7920 display attractive for use in Arduino projects where other pins need to be reserved for all kinds of peripheral devices and actions. In spite of the impressive 20 pins that decorate this board only three pins of an Arduino are essential to make the display work, that is: in SPI mode. In this paper we discuss a very common type of 128×64 LCD display breakout based on the ST7920 controller. One of the solutions to display data collected with sensors attached to an Arduino microcontroller board is via a graphic 128×64 LCD display (Figure 1).Because the pixels are neatly arranged in 128 columns, 64 rows where every individual pixel is addressable these displays offer graphic capabilities where even images can be displayed (of course in monochrome). This display is used to present data collected with a Dallas DS18B20 temperature sensor and a DHT11 relative humidity sensor. Here we discuss the wiring of a ST7920 based 128×64 graphical 12864B LCD breakout display.

#U8GLIB PINOUT FOR ARDUINO MEGA SOFTWARE#

The payoff is presentation with considerable flexibility thanks to the existence of built-in characters and, in software for the Arduino, an extensive u8g graphics library, i.e., the same library that supports display of graphics on OLED displays. These displays are more complicated to program than the ‘common’ 16×2 or 20×4 LCD displays that present two or four rows of fixed character positions. Graphic 128×64 LCD displays are based on (monochrome) LCD technology, yet they offer interesting graphical capabilities because every pixel is individually addressable. By Floris Wouterlood – The Netherlands – August 11, 2017

U8glib pinout for arduino mega