Saving files to device on Thonny

[cecily555]

I am working on a project to read pressure and temperature data from a sensor, saving it to a .csv file and exporting the data to another application to create a graph. I have written the following code in Thonny. I am using the Raspberry Pi Pico 2 as my microprocessor.

`from machine import Pin, I2C
from utime import sleep
from bmp280 import BMP280I2C

i2c0_sda = Pin(0)
i2c0_scl = Pin(1)
i2c0 = I2C(0, sda=i2c0_sda, scl=i2c0_scl, freq=400000)
bmp280_i2c =BMP280I2C(0x77,i2c0) # address may be different
temp_and_pressure = open("temp_and_pressure_file.csv","a")

while True:
readout = bmp280_i2c.measurements
pressure = readout['p']
temperature = readout['t']
print("reading taken")
try:
temp_and_pressure.write(str(temperature))
temp_and_pressure.write(",")
temp_and_pressure.write(str(pressure))
temp_and_pressure.write("\r\n")
except OSError:
print("Disk full?")
sleep(1.5)`

However, the file is created and saved locally on the pico board, and I cannot work out how to graph this data. Is there any way to write code to create and save the file to my computer instead of the pico? Alternatively, could I directly export the file from my pico into a graphing application on my MacBook? I have already tried using matplotlib, but I am using MicroPython and can't install many of the modules it relies on (like abc). Can anyone help?

[robert-hh]

You cannot write directly from the board into the PC's file system. It always needs some kind of agent to receive data sent by the board. A very simple method to do so is using mpremote mount PC-path, which map the PC directory PC-path as path /remote at the board. Data written to a file at /remote on the board is written to a file with the same name at the PC's PC-path.
Other options would be to just print the data at the board and have a logger at the PC, which captures the data and write it to a file.