ST7735 LCD display  instructions 1.8 inch 128x160 V1.1
By D@CC
On 2021EMay22

LCD-025 pin count: 8

This contains 3 sub-articles
1) too complex
2) Simple Wiring and Software by Jake Walker
	uses SPI and Python-3 on a Raspberry Pi
3) SPI on the WeatherHat-Pro
	used with a Raspberry Pi
********************************************************************************************************************
ignore everything down to Jake walker
Pins on	Pins in		Raspberry	Photo		Description
ST7735	Document	Pi		Label
					ST7735	Pi
LED					
SCK	SPI clock	SLCK				SPI clock
SDA					
A0						18
RESET	RST		GPIO24			19
CS	CS		CEO			23	Chip Select
GND	GND		GND			
VCC	Vin		3V3		1	 1
?					
	
?	D/C		GPIO25				SPI Chip Select
?			MOSI				SPI MOSI
	LITE		3V3				backlight of screen

					Vin
					3V3
					Gnd
					SCC
					SO
					SI
					RST
					D/C
					CCS
					Lite

				GPIO	Pi     1.8 photo		   ST7735	Documentation
				name	phys	pin		name	pin	Description
				Gnd	 6	10	Black	GND	 2	GND ok
				3V3	 1	 9	Red	LED	 8	LITE (connected to 3v3)
				GPIO24	18	 8	Blue	RESET	 4	RST ok
				GPIO25	22	 7	Purple	A0?	 5	D/C SPI Chip Select ok	bit A
					nc	 6
			      SPI-CEO	24	 5	White	CS	 3	CS SPI Chip Select ok	bit B
			      SPI-MOSI	19	 4	Yellow	SDA?	 6	MOSI
			      SPI-SCLK	23	 3	Green	SCK	 7	SPI CLK
					nc	 2
				3V3	 1	 1	Red	VCC	 1	3V ok
			       SPI-MISO	21	nc
			       SPI-CEI	26	nc

Source 01: https://circuitpython.readthedocs.io/en/latest/shared-bindings/displayio/#displayio.FourWire

*******************************************************************************************************************************

This Wiring corresponds to Source 02 below

Screen Pin	Raspberry Pi Pin					Screen Pin  (bottom
his ST7735							my ST7735   to top)
								pin	label
BL		Not connected					 8	LED
SCL		GPIO 11 (pin 23)					 7	SCK
SDA		GPIO 10 (pin 19)					 6	SDA
DC		GPIO 24 (pin 18)					 5	A0	Note: above uses GPIO25 instead
RES		GPIO 25 (pin 22)					 4	RESET	Note: above uses GPIO24 instead
CS		GPIO 8 (pin 24)					 3	CS
GND		Ground (pins 6, 9, 14, 20, 25, 30, 34 or 39)	 2	GND
VCC		5v Power (pins 2 or 4)				 1	VCC

After wiring, the screen should glow white.

His install and setup code:

# inserted by D@CC 

NOTE Be sure to use Python 3 (not Python 2)
>>> sudo apt update
----------------------------------------------------------------------------------------------------------------------------------------
>>> sudo raspi-config
	select '3- Interface Options', then 'Pr-SPI', select 'Yes"
>>> sudo python3 -m pip install Rpi.GPIO spidev Pillow numpy
>>> sudo python3 -m pip install st7735

-----------------------------------------------------------------------------------------------------------------------------------------
progName="st7735-pi.py"
# by jakew.me on 2018/01/19
print(progName)
-----------------------------------------------------------------------------------------------------------------------------------------
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont

import ST7735

disp = ST7735.ST7735(port=0, cs=0, dc=24, backlight=None, rst=25, width=128, height=160, rotation=0, invert=False)

WIDTH = disp.width
HEIGHT = disp.height

img = Image.new('RGB', (WIDTH, HEIGHT))
draw = ImageDraw.Draw(img)

# Load default font.
font = ImageFont.load_default()

# Write some text
draw.text((5, 5), "Hello World!", font=font, fill=(255, 255, 255))

# Write buffer to display hardware, must be called to make things visible on the
# display!
disp.display(img)
# by jakew.me
#source: https://jakew.me/2018/01/19/st7735-pi/
-----------------------------------------------------------------------------------------------
print("end of ", progName)
#end program
------------------------------------------------------------------------------------------------

This appears to match the wiring shown in at the previous web site (above) but GPIO24 and GPIO25 are switched.

This is supposed to show "Hello World" on the ST7735 display.


Source 02 by Jake Walker  ST7735 on a Raspberry Pi
	https://jakew.me/2018/01/19/st7735-pi/
Source 03 (not reviewed by D@CC)
	https://www.ebay.co.uk/usr/karens_e-shop
******************************************************************************
The SPI pins on the WeatherHat-Pro are

Pi		label on		ST7735 
GPIO	WeatherHat-Pro		label

3.3V		3V3		1 VCC
GPIO10		MOSI		6 SDA
GPIO 9		MISO		   nc
GPIO11		SCLK		7 SCK
GPIO 8 CE0?	SP10		5 A0	need to discover
GPIO 7 CE1?	SP11		3 CS	need to verify
GND		GND		2 GND

?		nc		8 LED	unused
?		RESET		4 RESET	need to assign

/ST7735_LCD.txt