memory allocation error when file size reduces
Posted: Sun May 24, 2020 6:09 am
Hi
I have been working on a project (to go in a water bottle rocket) to log altitude by plugging a micro:bit into an enviro:bit - which has a BME280 pressure sensor.
I have run into memory allocation errors before, but this is a weird one - the code I have work fine until I started removing some lines and then I get a Memory allocation error. Has anyone seen this before?
This is the code that does run:
I have also been having trouble getting good results from the enviro:bit - even leaving it on the floor and recording the altitude results in wildly different results. But this is a secondary problem.
thanks
Simon
I have been working on a project (to go in a water bottle rocket) to log altitude by plugging a micro:bit into an enviro:bit - which has a BME280 pressure sensor.
I have run into memory allocation errors before, but this is a weird one - the code I have work fine until I started removing some lines and then I get a Memory allocation error. Has anyone seen this before?
This is the code that does run:
Code: Select all
from microbit import display, Image, button_a, sleep, running_time
import os
import math
import bme280
delay = 5000
duration = 30000
max_height = 0
display.show(Image.HAPPY)
bme = bme280.bme280()
p0 = bme.pressure()
sleep(delay)
display.show(Image.YES)
if not button_a.is_pressed():
p0 = bme.pressure()
bme.set_qnh(p0)
n = len(os.listdir())
data = open("alt{}.csv".format(n-2), "w")
data.write("time,altitude,pressure,hyposometric,h2\n")
while True:
td = running_time() - delay
if not td % 500:
h = bme.altitude()
p = bme.pressure()
t = bme.temperature()
h1 = ((math.pow((p0/p), 1.0/5.257) - 1.0) * (t + 273.15)) / 0.0065
h2 = math.log(p0/p) * ((287.058 * (t + 273.15)) / 9.80665)
max_height = h2 if h2 > max_height else max_height
data.write("{},{},{},{},{}\n".format(td, h, p, h1, h2))
if td > duration:
break
data.close()
display.scroll("{:.2f}".format(max_height), loop=True)
else:
display.show(Image.NO)thanks
Simon