Random Noise and Positions on Nokia 5110 LCD Display
i use random screen positioning on refresh , "noise" obscuring characters on nokia 5110. on power screen display correctly, on following display loops position characters wrong, or garble characters. after few minutes, display show total garbage in 1 area , repower fixes (not reset). provide suggestions focus on fix this?:
1) connections - loose in breadboard?
2) voltages
3) software
4) nokia / board problem.
i using arduino uno. nokia 5110 controlled pcd8544 board (pin 1 on left in image). connections follows:
wiring :
name/fun arduino pin pcd8544 pin note
-------- ----------- ------------- ------------------
vcc 3.2v out 1 power: 2.8 - 3.2v
gnd / neg gnd 2 ground
sce 7 3 chip enable / select
rst 6 4 reset
dc 5 5 data/commnd
sdin/dn(mosi) 11 6 serial data out (master)
sclk 13 7 serial clock
backlight n/a 8 backlight - use 330 ohm res. connect gnd
i have soldered header pins , pins stuck in breadboard.
i using 500k (yes, that's took) resistors step down voltage arduino outs inputs 5v 3.3v.
i have tried many libraries , programs , don't display (which separate problem). 1 exception julian ilett's youtube project. adapted code, works, attached.
also image of project attached.
1) connections - loose in breadboard?
2) voltages
3) software
4) nokia / board problem.
i using arduino uno. nokia 5110 controlled pcd8544 board (pin 1 on left in image). connections follows:
wiring :
name/fun arduino pin pcd8544 pin note
-------- ----------- ------------- ------------------
vcc 3.2v out 1 power: 2.8 - 3.2v
gnd / neg gnd 2 ground
sce 7 3 chip enable / select
rst 6 4 reset
dc 5 5 data/commnd
sdin/dn(mosi) 11 6 serial data out (master)
sclk 13 7 serial clock
backlight n/a 8 backlight - use 330 ohm res. connect gnd
i have soldered header pins , pins stuck in breadboard.
i using 500k (yes, that's took) resistors step down voltage arduino outs inputs 5v 3.3v.
i have tried many libraries , programs , don't display (which separate problem). 1 exception julian ilett's youtube project. adapted code, works, attached.
also image of project attached.
you run vcc off 3.3v pin, no need resistors on signal pins. having said picture looks pretty there can't wrong in hardware other perhaps sloppy breadboard.
there library philips - pcd8544.h, , 1 rinky dink henning karlsen. submit wasting time if don't use 1 or other.
i understand 5110 cobbles own software spi, there no need use hardware spi, , might bad idea. philips library not call arduino's spi pins.
pleads read please reads @ head of forumg, , submit code in proper manner using
there library philips - pcd8544.h, , 1 rinky dink henning karlsen. submit wasting time if don't use 1 or other.
i understand 5110 cobbles own software spi, there no need use hardware spi, , might bad idea. philips library not call arduino's spi pins.
pleads read please reads @ head of forumg, , submit code in proper manner using
code: [select]
</> code tags
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