+3,3V
try&error:
10% of the displays, especially when
they >45°C, show only white screen
after start up. Something went wrong
on their init. C is needed to avoid this.
i = 0,8mA @ BL-PMW 0 ( =0V )
i = 59mA @ BL-PWM 255 ( =4,8V )
10K
Reset circuit of
Arduino NANO
+5V
Reset
SR
1,8“ TFT, 160x128 inkl. SD
R1
2Ω
DTR
ATMEGA
internal pin
(output)
exact value = ?
+5V
what I did...
J3Y
(npn
40V)
10K
1
RST
RS
SDA
CLK
SCK
VCC
CLK
14
GND
1K2
TFT
CS
BL
1K2
MISO
SD
8
510
IN
C1
i = 2,3mA @ 3,3V
nonsense, RST 5V
able due to that
40V transistor
NC
DIN
VCC
1K2
BL
2xLED
white
K
A
D/C
GPIO
NC
inside
Display
ST7735
connector
1
CS
1K2
GND
VCC
10µF
(SMD
kerko)
RST
PWM 0-255
1
LED current limiter
R2
1K
AM1117 OUT
3,3V
GND C2
MOSI
C3
solder strap
to short the
AM1117
CS
NC
NC
Roman Brand (2019)
16