First steps into micropython and rpi pico. Need help with error OSError: [Errno 110] ETIMEDOUT

[machasm1]

Hi all.
I have just built a mini space invader game using a rpi pico and ssd1306 screen as shown here.
https://www.printables.com/model/72272-rpi-pico-arcade
Unfortunately I get an error when running the code and no output on the display.
Here is the error in Thonny
Traceback (most recent call last): File "<stdin>", line 28, in <module> File "/lib/ssd1306.py", line 110, in __init__ File "/lib/ssd1306.py", line 36, in __init__ File "/lib/ssd1306.py", line 71, in init_display File "/lib/ssd1306.py", line 115, in write_cmd OSError: [Errno 110] ETIMEDOUT

Here is a copy of the program I copy and pasted from the author
`#Pico Invaders!

TODO : Implement alien shots, Shields, Sound

from machine import Pin, I2C, ADC, PWM
from ssd1306 import SSD1306_I2C
from time import sleep
import framebuf
import random

WIDTH = 128 # oled display width
HEIGHT = 64 # oled display height

#up = Pin(2, Pin.IN, Pin.PULL_DOWN) # for future games
#down = Pin(3, Pin.IN, Pin.PULL_DOWN) # for future games
left = Pin(4, Pin.IN, Pin.PULL_UP)
right = Pin(5, Pin.IN, Pin.PULL_UP)
button1 = Pin(14, Pin.IN, Pin.PULL_UP)

#removed for conversion to buttons

#Pot = ADC(26)
#conversion_factor = 3.3 / (65535) # Conversion from Pin read to proper voltage

speaker = PWM(Pin(18))

i2c = I2C(0) # Init I2C using I2C0 defaults, SCL=Pin(GP9), SDA=Pin(GP8), freq=400000

oled = SSD1306_I2C(WIDTH, HEIGHT, i2c) # Init oled display

lowres = True

if lowres == True:
#smaller alien sprites. set spritex to 5 and spritey to 5
inv1a = bytearray(b"\xd0xPx\xf0")
inv1b = bytearray(b"\xf0xPx\xd0")
inv2a = bytearray(b"\xe0P\xf8P\xe0")
inv2b = bytearray(b"\xd0x\xd0")
spritex = 5 #how big are your alien sprites?
spritey = 5
aliencountx = 4 #How many rows and columns of aliens
aliencounty = 5
alienspacingx = 5
alienspacingy = 3
else:
#sprite definitions for Aliens. set spritex and spritey to 7
inv1a = bytearray(b"\xd8\x88\xf8\x88\xd8")
inv1b = bytearray(b"|\xda\xc8\xf8\xc8\xda|")
inv2a = bytearray(b"\x88\:\x1e:\\x88")
inv2b = bytearray(b"\x08\\xba\x1e\xba\\x08")
spritex = 7 #how big are your alien sprites?
spritey = 7
aliencountx = 4 #How many rows and columns of aliens
aliencounty = 4
alienspacingx = 3
alienspacingy = 3
logo = bytearray(b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1f\xff\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1f\xff\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1f\xff\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xbd\xe0\x00\x00\x00\x00\xff\xfc\x00\x00\x00\x00\x00\x00\x00\x07\xbd\xe0\x00\x00\x00\x00\xff\xfc\x00\x00\x00\x00\x00\x00\x00\x07\xbd\xe0\x00\x00\x00\x00\xff\xfc\x00\x00\x00\x01\xff\x80\x00\x07\xbd\xe0\x00\x00\x00\x00\x03\xe0\x00\x00\x00\x01\xff\x80\x00\x00\x00\x00\x00\x00\x00\x00\x1f\x00\x00\x00\x00\x01\x08\x80\x00\x00\x01\xef\x00\x00\x00\x00\xff\xfc\x00\x00\x00\x01\x08\x80\x00\x00\x01\xef\x00\x00\x00\x00\xff\xfc\x07\xff\xe0\x01\x08\x80\x00\x00\x01\xef\x00\x00\x00\x00\xff\xfc\x07\xff\xe0\x01\x08\x80\x00\x00\x01\xef\x00\x00\x00\x00\x00\x00\x07\xff\xe0\x01\xff\x80\x00\x00\x00\x00\x00\x00\x00\x00\x05\x00\x008\xe0\x00\xf7\x00\x00\x07\xbd\xefx\x1e\x00\x02\xff\x00\x00\x18\xe0\x00\x00\x00\x00\x07\xbd\xefx\x1e\x00?\xff\x00\x00?\xe0\x00\x0c\x00\x00\x07\xbd\xefx\x1e\x00?\xd0\x00\x00\x1f\xc0\x08<\x00\x00\x07\xbd\xefx\x1e\x00<\x00\x00\x00\x0f\x80\x0c\xf0\x00\x00\x00\x00\x00\x00\x00\x00?\xff\x00\x00\x00\x00\x07\xc0\x00\x00\xf0=\xe0{\xc0\x00?\xff\x00\x00\x00\x00\x03\xc0\x00\x00\xf0=\xe0{\xc0\x00\x00\xbf\x00\x00\x00\x00\x00\xf0\x00\x00\xf0=\xe0{\xc0\x00\x00\x00\x00\x00\x00\x00\x00<\x00\x00\xf0=\xe0{\xc0\x00\x00\x00\x00\x00\x00\x00\x0c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x7f\xc0\x07\xff\xe0\x00\x00\x00\x00\xf0=\xefx\x00\x00\x00\x7f\xfe\x07\xff\xe0\x00\x00\x00\x00\xf0=\xefx\x00\x00\x00\x1e\xfe\x07\xff\xe0\x00\x00\x00\x00\xf0=\xefx\x00\x00\x00\x18\x1e\x00\x00\x00\x00\x00\x00\x00\xf0=\xefx\x00\x00\x00?\xfe\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x7f\xfe\x00\x00\x00\x01\xff\x80\x00\x00=\xefx\x00\x00\x00\x7f\x80\x00\x00\x00\x01\xff\x80\x00\x00=\xefx\x00\x00\x00@\x00\x00\x00\x00\x00\x10\x80\x00\x00=\xefx\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10\x80\x00\x00=\xefx\x00\x00?\xff\x00\x01\xff\x80\x00\x10\x80\x00\x00\x00\x00\x00\x00\x00?\xff\x00\x03\xff\xc0\x00\x10\x80\x00\xf0=\xefx\x00\x00?\xff\x00\x07\xff\xe0\x00\x1f\x80\x00\xf0=\xefx\x00\x008\x07\x00\x07\x00\xe0\x00\x0f\x00\x00\xf0=\xefx\x00\x000'\x00\x06\x00\xe0\x00\x00\x00\x00\xf0=\xefx\x00\x00?\xff\x00\x07\xe7\xe0\x01\xfc\x00\x00\x00\x00\x00\x00\x00\x00\x1f\xfe\x00\x03\xe3\xc0\x01\xfc\x00\x00\xf0=\xe0{\xc0\x00\x0f\xfc\x00\x01\xe3\x80\x00\x04\x00\x00\xf0=\xe0{\xc0\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\xf0=\xe0{\xc0\x00\x00\x7f\xfe\x00\x00\x00\x01\xfc\x00\x00\xf0=\xe0{\xc0\x00\x00\x7f\xfe\x00\x00\x00\x01\xf8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x7f\xfe\x00\x00\x00\x00\x00\x00\x00\x07\xbd\xefx\x1e\x00\x00q\xce\x01\xff\x80\x00\x00\x00\x00\x07\xbd\xefx\x1e\x00\x00\xc6\x03\xff\xc0\x01\xff\x80\x00\x07\xbd\xefx\x1e\x00\x00p\x8e\x07\xff\xe0\x01\xff\x80\x00\x07\xbd\xefx\x1e\x00\x00\x00\x00\x07\x00\xe0\x00\x10\x80\x00\x00\x00\x00\x00\x00\x00\xff\xfc\x00\x06\x04\xe0\x00\x10\x80\x00\x00\x01\xef\x00\x00\x00\xff\xfc\x00\x07\xff\xe0\x00\x10\x80\x00\x00\x01\xef\x00\x00\x00\xff\xfc\x00\x03\xff\xc0\x00\x10\x80\x00\x00\x01\xef\x00\x00\x00\x03\x9c\x00\x01\xff\x80\x00\x1f\x80\x00\x00\x01\xef\x00\x00\x00\t\x9c\x00\x00\x00\x00\x00\x0f\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfc\x00\x00\x00\x00\x00\x00\x00\x00\x07\xbd\xe0\x00\x00\x00\xfe\xf8\x00\x00\x00\x00\x00\x00\x00\x00\x07\xbd\xe0\x00\x00\x00\xfep\x00\x00\x00\x00\x00\x00\x00\x00\x07\xbd\xe0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xbd\xe0\x00\x00\x00\x00\x1cx\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00<\xfc\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00|\xfe\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00q\xce\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x7f\xde\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00?\x9c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1f\x18\x00\x00\x00")

ship = bytearray(b" p\xf8l>//>l\xf8p ")
ufo = bytearray(b"\x0c\x00>\x80\x1d\x80\r\xe0\x1d\xc0\x15\x80>\x80\x0c\x00")

num0 = bytearray(b"\x7f\x80\xff\xc0\x80@\x80@\xff\xc0\x7f\x80")
num1 = bytearray(b"\x00\x00\x00\x80\x00\x80\xff\xc0\xff\xc0\x00\x00")
num2 = bytearray(b"\xe1\x80\xf1\xc0\x98@\x8c@\x87\xc0\x83\x80")
num3 = bytearray(b"@\x80\xc0\xc0\x84@\x84@\xff\xc0{\x80")
num4 = bytearray(b"0\x00<\x00/\x00#\x80\xff\xc0\xff\xc0")
num5 = bytearray(b"O\xc0\xcf\xc0\x84@\x84@\xfc@x@")
num6 = bytearray(b"\x7f\x80\xff\xc0\x84@\x84@\xfc\xc0x\x80")
num7 = bytearray(b"\x00@\xe0@\xfc@\x1f@\x03\xc0\x00\xc0")
num8 = bytearray(b"{\x80\xff\xc0\x84@\x84@\xff\xc0{\x80")
num9 = bytearray(b"G\x80\xcf\xc0\x88@\x88@\xff\xc0\x7f\x80")

aliens = []
class Alien(object):

def __init__(self, type, x, y):
    self.visible = True
    self.type = type
    self.x = x
    self.y = y
    self.origx = x
    self.origy = y

def create_alien(type, x, y):
alien = Alien(type, x, y)
return alien

def define_aliens():
type = "inv1a" #First row is type 1.
for x in range (1, aliencountx + 1):
for y in range (1, aliencounty + 1):
aliens.append(create_alien(type, (120 - ((x * (spritex + alienspacingx)) - spritex)), (y * (spritey + alienspacingy)) - spritey))
if type == "inv1a":
type = "inv2a" #Second row is type 2
else:
type = "inv1a"

def reset_aliens(visibility): # Used to reset aliens to starting position and, optionally, visibility
x = 1
y = 1
for c in aliens:
if visibility:
c.visible = True

    c.x = c.origx
    c.y = c.origy

Load images into framebuffer

inv1aBuff = framebuf.FrameBuffer(inv1a, 7, 7, framebuf.MONO_HLSB)
inv1bBuff = framebuf.FrameBuffer(inv1b, 7, 7, framebuf.MONO_HLSB)
inv2aBuff = framebuf.FrameBuffer(inv2a, 7, 7, framebuf.MONO_HLSB)
inv2bBuff = framebuf.FrameBuffer(inv2b, 7, 7, framebuf.MONO_HLSB)

ufoBuff = framebuf.FrameBuffer(ufo, 12, 8, framebuf.MONO_HLSB)

logoBuff = framebuf.FrameBuffer(logo, 128, 64, framebuf.MONO_HLSB)

#Dictionary for lookup of digits for score, level, possibly lives
numbers = {
'0': framebuf.FrameBuffer(num0, 10, 6, framebuf.MONO_HLSB),
'1': framebuf.FrameBuffer(num1, 10, 6, framebuf.MONO_HLSB),
'2': framebuf.FrameBuffer(num2, 10, 6, framebuf.MONO_HLSB),
'3': framebuf.FrameBuffer(num3, 10, 6, framebuf.MONO_HLSB),
'4': framebuf.FrameBuffer(num4, 10, 6, framebuf.MONO_HLSB),
'5': framebuf.FrameBuffer(num5, 10, 6, framebuf.MONO_HLSB),
'6': framebuf.FrameBuffer(num6, 10, 6, framebuf.MONO_HLSB),
'7': framebuf.FrameBuffer(num7, 10, 6, framebuf.MONO_HLSB),
'8': framebuf.FrameBuffer(num8, 10, 6, framebuf.MONO_HLSB),
'9': framebuf.FrameBuffer(num9, 10, 6, framebuf.MONO_HLSB)}

shipBuff = framebuf.FrameBuffer(ship, 8, 12, framebuf.MONO_HLSB)

Clear the oled display in case it has junk on it.

oled.fill(0)
oled.blit(logoBuff, 0, 0)

Finally update the oled display so the image & text is displayed

oled.show()

sleep(2)

addy = 3 #pixels of movement per turn on aliens

shotx = 1
shoty = 140
loopCount = 0
define_aliens()
score = 0
difficulty = 1
showufo = False
ufoy = 0
ufoCount = 0
soundfreq = 160
shippos = 30
while True:
if showufo:
if soundfreq == 1100: soundfreq = 2000
else: soundfreq = 1100
speaker.freq(soundfreq)
speaker.duty_u16(2000)
if shotx > 36 and showufo == False: speaker.duty_u16(0)
ufoChance = random.randrange(1, 350, 1) # 1 in 1000 chance of running this loop that UFO will appear
if ufoChance == 123 and showufo == False:
showufo = True
ufoy = 0
if showufo:
ufoy = ufoy + 1
if ufoy > 64:
showufo = False
loopCount = loopCount + 1
oled.fill(0)
if loopCount > 16 - difficulty:
if showufo == False:
if soundfreq == 180: soundfreq = 160
elif soundfreq == 160: soundfreq = 140
elif soundfreq == 140: soundfreq = 120
else: soundfreq = 180
speaker.freq(soundfreq)
speaker.duty_u16(2000)

    dropdown = False
    loopCount = 0
    for c in aliens:
        if c.visible == True: #switch between sprites to animate aliens
            if c.type == "inv1a": c.type = "inv1b"
            elif c.type == "inv1b": c.type = "inv1a"
            elif c.type == "inv2a": c.type = "inv2b"
            elif c.type =="inv2b": c.type = "inv2a"
            if c.y + addy > 56 or c.y + addy < 0: #are any of the visible invaders at the edge of the screen?
                if c.x - 3 < 20: #If they're at the bottom, reset their position
                    reset_aliens(False)
                    dropdown = False
                dropdown = True
    if dropdown == True: #move the aliens down if any of the visible ones hit the screen edge
        addy = addy * -1
        for c in aliens:
            c.x = c.x - 3 
    else:
        for c in aliens:
            c.y = c.y + addy
            
if left.value() == 0:
    if shippos > 1:
        shippos = shippos - 1

if right.value() == 0:
    if shippos < 60:
        shippos = shippos + 1

shotx = shotx + 2
foundVisible = False #By default, assume all the aliens are dead
if showufo:
    if shotx > 120 and shotx < 140:
        if shoty >= ufoy:
            if shoty < ufoy + 12:
                score = score + 50
                showufo = False
                ufoy = 0
                shotx = 140
                shoty = int(shippos) + 6
                
for c in aliens:
    if shotx >= c.x and c.visible == True: #Collision detection for aliens with the shots
        if shotx - 4 <= c.x + 8:
            if shoty > c.y:
                if shoty <= c.y + 7: #You hit an alien!
                    c.visible = False 
                    score = score + 10
                    shotx = 140
                    shoty = int(shippos) + 6
    if c.visible == True:
        foundVisible = True
        if c.type == "inv1a": #Display aliens
            oled.blit(inv1aBuff, c.x, c.y) #display animation frame 1, set to frame 2 for next time
        elif c.type == "inv1b":
            oled.blit(inv1bBuff, c.x, c.y) #display animation frame 2, set to frame 1 for next time
        elif c.type == "inv2a":
            oled.blit(inv2aBuff, c.x, c.y) #display animation frame 1, set to frame 2 for next time
        elif c.type == "inv2b":
            oled.blit(inv2bBuff, c.x, c.y) #display animation frame 2, set to frame 1 for next time
    if showufo:
        oled.blit(ufoBuff, 120, ufoy)
if shotx > 130:
    if button1.value() == 0:
        shotx = 32
        shoty = int(shippos) + 6
    else:
        shotx = 140

if foundVisible == False: # You finish the level! Increase the difficulty and reset the aliens
        if difficulty < 10:
            difficulty = difficulty + 1
        reset_aliens(True)

oled.blit(shipBuff, 18, int(shippos)) # draw the ship
oled.line(shotx, shoty, shotx - 4, shoty, 1) #draw the laser

numcount = 0 #keeps track of the number of times through the loop!

for c in str(score):
    oled.blit(numbers[c], 1, ((numcount * 7) + 2)) #Display the score, 1 digit at a time
    numcount = numcount + 1

numcount = 0

for c in str(difficulty):
    oled.blit(numbers[c], 1, 48 + ((numcount * 7) + 2)) #Display the level, 1 digit at a time
    numcount = numcount + 1
              
oled.show()
if shotx == 32 and showufo == False:
    speaker.duty_u16(0)
    speaker.freq(1000)
    speaker.duty_u16(2000)

sleep(0.001)

`

Any help greatly appreciated.
Thanks.

[ned-pcs]

It sounds like you are having I2C problems. Maybe you haven't got pull-up resistors on your I2C SCL and SDA lines?
Try this to see if you have communications:

from machine import I2C, Pin
i2c = I2C(0, scl=Pin(9), sda=Pin(8), freq=400000)
i2c.scan()  

This will print the I2C bus addresses of each I2C peripheral found.
You should see at least one number printed out (and it should be the address of your display).
Per the datasheet:
There should also be external pull-ups on the board as the internal pad pull-ups may not be strong enough to pull up external circuits.

[machasm1]

Pull up resistors did the trick