How to write sensor data so seperate text file (Raspberry Pi, Python)
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I have a pm2.5 sensor attached to a raspberry pi. I got the code working for the sensor but I want to be able to store the values being outputted. I was wondering what I needed to change to be able to write the data to a text file.
Heres my code:
import time
import board
import busio
from digitalio import DigitalInOut, Direction, Pull
import adafruit_pm25
import serial
uart = serial.Serial("/dev/ttyS0", baudrate=9600, timeout=0.25)
print("Found PM2.5 sensor, reading data...")
while True:
time.sleep(1)
try:
aqdata = pm25.read()
# print(aqdata)
except RuntimeError:
print("Unable to read from sensor, retrying...")
continue
print()
print("Concentration Units (standard)")
print("---------------------------------------")
print(
"PM 1.0: %d\tPM2.5: %d\tPM10: %d"
% (aqdata["pm10 standard"], aqdata["pm25 standard"], aqdata["pm100 standard"])
)
print("Concentration Units (environmental)")
print("---------------------------------------")
print(
"PM 1.0: %d\tPM2.5: %d\tPM10: %d"
% (aqdata["pm10 env"], aqdata["pm25 env"], aqdata["pm100 env"])
)
print("---------------------------------------")
print("Particles > 0.3um / 0.1L air:", aqdata["particles 03um"])
print("Particles > 0.5um / 0.1L air:", aqdata["particles 05um"])
print("Particles > 1.0um / 0.1L air:", aqdata["particles 10um"])
print("Particles > 2.5um / 0.1L air:", aqdata["particles 25um"])
print("Particles > 5.0um / 0.1L air:", aqdata["particles 50um"])
print("Particles > 10 um / 0.1L air:", aqdata["particles 100um"])
print("---------------------------------------")
pythonraspberry-pilorashareedit follow flag asked 8 hours agoJohn Hooft1 New contributor
- Just as a minor note, try to use f-Strings if the Python version permits. Instead of doing your
%dthings, just do this:f"PM 1.0: {aqdata["pm10 env"]} ..."– Dustin 7 hours ago
1 Answer
Use this:
measurement_values = [0.3, 0.5, 1.0]
measurement_strings = [f"Particles > {size}um / 0.1L air" for size in measurement_values]
with open("myfile.txt", "w") as f:
# Write block of string
f.write("Block of string")
# Write whole list
f.writelines(L)
shareedit follow flag answered 7 hours agoDustin11066 bronze badges
- 1Did you mean to include the “f” in [f”Particles >….. – John Hooft 6 hours ago
- 1Yes. This is called an f-string, where instead of using %d and format, you can simply write the variable names into your string in the {}. There are other letters you can put before strings, such as u (I believe unicode), r (raw, for instance if you don’t want the \ in filenames to mess up stuff) and likely a few more. – Dustin 6 hours ago
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