ARDUINO PROJECT: LCD on SPI
Posted by kll on February 21 2013 22:50:16

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From DFRobot
( via THAIDUINO ) i got a LCD, its 128 * 64 px

or 4 lines with text each char as 16 * 8 px



for datasheet see ST7920






for order need:

SPI LCD Module 695THB

Interface shield 453THB

Shiftout cable 90THB



its about 27€

there is no documentation available!

but here some pictures:



























on the back of the LCD panel is the connector for the shiftout cable from the

interface shield. In the software Pin 3,8,9 are used,

so its not connected to Arduino SPI

select by switch SPI on and BL (backlight) ON

with a poti can adjust the backlight



for learning i play with the

-- logo ( load a graphic display )

-- writing the 4 lines ( must have each 16 (unsigned) char)

-- show some measurement data



until now i did not find a library to operate graphic









as next step i made a small menu system on the LCD,

-- mainpage, 3 submenu

-- 3 submenupages with each 3 job links



the selected menu line is indicated



operation is by 2 buttons,

Pin6: down....in a loop over the 4 lines,

Pin7: right / select ( submenu or job..)



pls see code



as there are the same questions as i have also in the ARDUINO forum

i come up with the idea to put the big LOGO code and the menu text code
from RAM to FLASH, because the ARDUINO UNO atmega328 only has 2kB SRAM


pls see code