Python 1Hz measurement temperature - csv

Question

I want to create csv file in python ,storing data from the sensor plus time stamp of the reading .But sensor measures fast and I need exactly 1 measurment from the sensor exactly after 1 sec.For example sensor value is 20 at time 12:34:15.and i need value exactly at 12:34:16 .I do not have to use time.sleep because it creates delay more than second and will affect the log file if i have to take readings more than hundred.

Answer 1

Consumer PCs do not have real-time operating systems and there is no guarantee that a particular process will execute at least once per second and certainly no guarantee that it will be executing at each 1 second interval. If you want precision timed measurements with Python, you should look as Micropython executing on a microcontroller board. It may be able to do what you want. Python on a Raspberry Pi board might also work better than a PC.
On a regular PC, I would start with something using perf_counter.
from time import perf_counter as timer
from somewhere import sensor, save # read temperature, save value
t0 = t1 = timer()
delta = .99999 # adjust by experiment to average 1 sec reading intervals
while True:
while t1 - t0 < delta:
t1 = timer()
value = sensor())
save(value)
t0 = t1