Hi, this is a script that works well for me.
Context : during an experiment, you want to save data collected from sensors.
You re doing many acquisitions so you need to save data in many files.
Hope it will help.
In this example, data (temperature and humidity) is generated by random numbers.
from m5stack import *
from m5ui import *
from uiflow import *
import os
import time
from random import randint
last_time = 0
Time_Interval = 5 #wait 5 seconds before the new data acquisition
abscisse = [] # the data is collected in 3 lists
temperatures = []
humidities = []
label0 = M5TextBox(50, 140, "", lcd.FONT_DejaVu18,0xFFFFFF, rotate=0)
# don't know why it s works without the sd_mount() instruction
#sd_mount()
# this function for a brand new screen
def refresh_screen():
setScreenColor(0x222222)
lcd.font(lcd.FONT_DejaVu18)
lcd.print("Welcome !", 10 , 20, 0xFFFFFF)
lcd.print("Writing Data on SDCard", 10 , 40, 0xFFFFFF)
lcd.print("Please Press Button B", 10 , 60, 0xFFFFFF)
lcd.print(" to save file", 10 , 80, 0xFFFFFF)
lcd.print("Current File length", 10 , 100, 0xFFFFFF)
wait(0)
# test if a file is already existing
def file_exists(fname):
try:
with open(fname):
pass
return True
except OSError:
return False
refresh_screen()
t0 = time.ticks_ms()
while True:
if (time.ticks_ms()-last_time) >= Time_Interval*1000:
last_time = time.ticks_ms()
new_time = (time.ticks_ms()-t0) // 1000
# when it s time, you can collect a new data from a sensor
# some kind of env.get_temperature, works here with numbers
temp = randint(200,300) / 10 # random number for temperature in °C
humi = randint(40,60) # random number for humidity in %
abscisse.append(new_time) # writing new value in each list
temperatures.append(temp)
humidities.append(humi)
label0.setText(str(len(abscisse)))
wait(0.1)
if btnB.isPressed():
file_path = "/sd/MeasuresTH0.txt"
while file_exists(file_path): # create a new file name if several acquisitions
file_path = file_path.replace("/sd/MeasuresTH"," ")
file_path = file_path.replace(".txt"," ")
file_path = file_path.strip()
file_path = int(file_path) + 1
file_path = "/sd/MeasuresTH"+str(file_path)+".txt"
f1 = open(file_path, 'w+', encoding="utf-8") # the file operations for writing on SDcard all the data in the same file
f1.write("{} \n".format(abscisse))
f1.write("{} \n".format(temperatures))
f1.write("{} \n".format(humidities))
f1.close()
label0.setText("Saved in \n" + file_path)
wait(2)
# reset all stuff and do it again
t0 = time.ticks_ms()
last_time = 0
abscisse = []
temperatures = []
humidities = []
setScreenColor(0x222222)
refresh_screen()
