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| import network | |
| import socket | |
| import time | |
| import struct | |
| from machine import Pin | |
| NTP_DELTA = 2208988800 | |
| host = "pool.ntp.org" | |
| led = Pin("LED", Pin.OUT) | |
| ssid = 'A NETWORK' | |
| password = 'A PASSWORD' | |
| def set_time(): | |
| NTP_QUERY = bytearray(48) | |
| NTP_QUERY[0] = 0x1B | |
| addr = socket.getaddrinfo(host, 123)[0][-1] | |
| s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) | |
| try: | |
| s.settimeout(1) | |
| res = s.sendto(NTP_QUERY, addr) | |
| msg = s.recv(48) | |
| finally: | |
| s.close() | |
| val = struct.unpack("!I", msg[40:44])[0] | |
| t = val - NTP_DELTA | |
| tm = time.gmtime(t) | |
| machine.RTC().datetime((tm[0], tm[1], tm[2], tm[6] + 1, tm[3], tm[4], tm[5], 0)) | |
| wlan = network.WLAN(network.STA_IF) | |
| wlan.active(True) | |
| wlan.connect(ssid, password) | |
| max_wait = 10 | |
| while max_wait > 0: | |
| if wlan.status() < 0 or wlan.status() >= 3: | |
| break | |
| max_wait -= 1 | |
| print('waiting for connection...') | |
| time.sleep(1) | |
| if wlan.status() != 3: | |
| raise RuntimeError('network connection failed') | |
| else: | |
| print('connected') | |
| status = wlan.ifconfig() | |
| print( 'ip = ' + status[0] ) | |
| led.on() | |
| set_time() | |
| print(time.localtime()) | |
| led.off() |
Modified defines for local time and local NTP host
NTP_DELTA = 2208988800 - 3600 # subtract 1 hour = 3600 seconds to get GMT + 1 for Portugal
host = "pt.pool.ntp.org" # using host from Portugal
I'm getting an intermittent failure running the code :
connected
ip = 192.168.3.58
Traceback (most recent call last):
File "", line 52, in
File "", line 24, in set_time
OSError: [Errno 110] ETIMEDOUT
Error message indicates its a time out but not sure what's causing the problem.
Hi Duncan,
I had that error also. That is why I created a try..except block. See the OSError part of it.
I also created extra logic to call set_time() only at: a) start; b) once in an hour. For the rest every second a REPL print of some time.localtime() data. See the next screenshot at the change of an hour:
Added variable tm_gmtoff, offset of GMT for Portugal:
The original script does call set_time() just once. That is OK for an example as this is.
I have the experience that the RTC's of various microcontollers in time deviate from NTP time.
That is why I decided to call set_time() at intervals to synchronize the built-in RTC.
I am still working on the script to have it fit better to my ideas.
I have published my project on the micropython forum:
https://forum.micropython.org/viewtopic.php?f=21&t=12761&p=69363&hilit=ntp#p69363
Paulus
Modified defines for local time and local NTP host NTP_DELTA = 2208988800 - 3600 # subtract 1 hour = 3600 seconds to get GMT + 1 for Portugal host = "pt.pool.ntp.org" # using host from Portugal
This fixed it for me. Thank you! I had to do "+ 21_600" to get to North America Central Time. Thank you again!
You're welcome
You guys have any idea on how to use this on an SSD1306 OLED screen? Nevermind figured it out!!
Thank you for sharing this code.
I've been hitting a error if I I rerun the script. I cannot see why.
I've added a little at the end but do not see why that should cause the upset. I've updated to the current latest uf2s and run on several different boards.
Extra code:
`
print(" ")
year,mon,day,h,m,s,weekday,x = time.localtime()
now = str(h)+":"+str(m)+":"+str(s)
date = str(year)+" "+months[mon]+" "+str(year)
print(now)
print(date)
print(wd[weekday])
`
ERRORs below
`
MPY: soft reboot
connected
ip = 192.168.0.79
(2025, 3, 8, 13, 40, 38, 5, 67)
13:40:38
2025 Apr 2025
Sat
%Run -c $EDITOR_CONTENT
MPY: soft reboot
connected
ip = 192.168.0.79
Traceback (most recent call last):
File "", line 53, in
File "", line 25, in set_time
OSError: [Errno 110] ETIMEDOUT
`
I tried this change: s.settimeout(5) but it did not help.
@tonygo . Did you add this try: ___ except: block into your code?
(From my post/reaction: Jul 18, 2022)
@tonygo . Did you add this try: ___ except: block into your code?
(From my post/reaction: Jul 18, 2022)
When I try this, I get an error on the line val=struct.unpack(...)
local variable referenced before assignment.
Presumably, msg is not set if the exception happens.
Hi, using this script provoked the error "machine" is not defined (line 30)
I changed line 6 into: "import machine".
line 11 into led = machine.Pin("LED", machine.Pin.OUT).
Then the script ran OK.