[英]run code every X seconds
I Have infinite loop that read bytes from serial port, I want to save the read data to firebase database every X seconds. 我有一个从串行端口读取字节的无限循环,我想每X秒将读取的数据保存到Firebase数据库。
I used this code snippet but it's not helping: 我使用了以下代码段,但没有帮助:
import threading
def printit():
threading.Timer(5.0, printit).start()
print "Hello, World!"
printit()
This is my code 这是我的代码
import serial
ser = serial.Serial()
ser.baudrate = 115200
ser.port = "/dev/ttyUSB0"
ser.timeout = 30
try:
try:
while 1:
line = ser.readline().rstrip().decode('utf-8')
# print("save data here every X seconds)
except KeyboardInterrupt:
ser.close() # Close port
pass
except serial.serialutil.SerialException as e:
print(str(e))
I can't use sleep because it blocking the main thread,So how to let the code read continuously and print "data saved" every X seconds (I'll save to database in my case) 我不能使用睡眠,因为它阻塞了主线程,所以如何让代码连续读取并每隔X秒打印“保存的数据”(我将保存到数据库中)
Thanks to Lutz Horn for the suggestion in the comment, I resolve the problem like that : 感谢Lutz Horn在评论中的建议,我解决了这样的问题:
import schedule
import time
import serial
ser = serial.Serial()
ser.baudrate = 115200
ser.port = "/dev/ttyUSB0"
ser.timeout = 30
schedule.every(10).seconds.do(save_db)
try:
try:
while 1:
schedule.run_pending()
line = ser.readline().rstrip().decode('utf-8')
# here every 10 seconds the function save_db will be called
except KeyboardInterrupt:
ser.close() # Close port
pass
except serial.serialutil.SerialException as e:
print(str(e))
I hope i have understood you correctly. 我希望我正确地理解了你。 Use
time.time()
to set timer. 使用
time.time()
设置计时器。
import time
def doEvery_X_Seconds():
print("I do it every X seconds")
time.sleep(1)
TIMER_LIMIT = 5
setTimer = time.time()
while(1):
print("hello world")
if(time.time() - setTimer >= TIMER_LIMIT):
doEvery_X_Seconds()
setTimer = time.time()
There is time.sleep(1)
only to demonstrate, that it works. 这里有
time.sleep(1)
仅用于演示它的工作原理。
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