设置 serial.readline() 的采样率

Question

如何以可控的速度执行 ser.readline()，比如说每 0.002 秒一次？下面的代码在 Python returns 每个运行之后的不同大小的列表中，这意味着采样率每次都不同。我想知道在给定所需采样率为 500 scans/second:

的情况下是否有一种从串口读取的受控方式

import numpy as np
from time import time
import serial

ser = serial.Serial('COM3', 115200, timeout=1)
ser.flushInput()

digital_data = np.array([])

# Set the end time 60 seconds from start
te = time() + 60

# While loop runs for 60 seconds
while time() <= te:
    digital_data = append(digital_data, ser.readline().decode('utf-8'))

print(len(digital_data)) # Varies in size for each run

Answer 1

这可能不准确，具体取决于 OS 您运行...

import numpy as np
import time
import serial

ser = serial.Serial('COM3', 115200, timeout=1)
ser.flushInput()

digital_data = np.array([])

# Set the end time 60 seconds from start
te = time.time() + 60

delay = 0.002

while time.time() <= te:
    start = time.time()
    digital_data = append(digital_data, ser.readline().decode('utf-8'))
    duration = time.time() - start
    if duration < delay:
        time.sleep(delay - duration)

print(len(digital_data)) # Varies in size for each run

设置 serial.readline() 的采样率

Setting sampling rate of serial.readline()

python

serial-port