ThreeSensors2.py Micropython

#all three sensors, OLED, SD, DS18b20 Thu Aug  1 11:24:10 NZST 2024 Worked.
#Combined digikey4 with Tom0Oled to get CD card reader and OLED display in one program. Worked 4:28,30/07/24
#first, do imports for SD card
print("Simple SD card testDigiKey1.1 ")  #Tue Jun 28 17:09:24 NZST 2022
print("Pi Pico and Code with Thonny.")
import machine
import sdcard
import os  #why not uos?
import onewire, ds18x20, time


#Next lines are for CD card. Originally from digikey4
from machine import Pin, I2C #12:04, 30/07/24 Worked
from ssd1306 import SSD1306_I2C

i2c=I2C(0,sda=Pin(0), scl=Pin(1), freq=400000)
oled = SSD1306_I2C(128, 64, i2c)

oled.text("Tom's Hardware69", 0, 0)
oled.show()


# Assign chip select (CS) pin (and start it high)
cs = machine.Pin(9, machine.Pin.OUT)  #does this really start high?

# Intialize SPI peripheral (start with 1 MHz) Check it IS 1000000
spi = machine.SPI(1,
                  baudrate=100000,
                  polarity=0,
                  phase=0,
                  bits=8,
                  firstbit=machine.SPI.MSB,
                  sck=machine.Pin(10),
                  mosi=machine.Pin(11),
                  miso=machine.Pin(8))

# Initialize SD card
sd = sdcard.SDCard(spi, cs)

vfs = os.VfsFat(sd)
os.mount(vfs, "/sd")

# Create a file and write something to it
with open("/sd/test03.txt", "w") as file:
    file.write("Hello,WWWWORX22345 691!! SD World!\r\n")
    file.write("This is a test and seems to work@@022 ABCDEfg\r\n")

# Open the file we just created and read from it
with open("/sd/test03.txt", "r") as file:
    data = file.read()
    print(data)
#Now do DS18b20 temperature stuff. Thethird sensor.
ds_pin = machine.Pin(22)
ds_sensor = ds18x20.DS18X20(onewire.OneWire(ds_pin))

roms = ds_sensor.scan()
print('Found DS devices: ', roms)
while True:
  ds_sensor.convert_temp()
  time.sleep_ms(750)
  for rom in roms:
    print(rom)
    tempC = ds_sensor.read_temp(rom)
    tempF = tempC * (9/5) +32
    print('temperature (ºC):', "{:.2f}".format(tempC))
    print('temperature (ºF):', "{:.2f}".format(tempF))
    print()
  time.sleep(5)