M5Stack学习笔记（7）—— 同NTP服务器同步时间
M5Stack里的时钟可以自动和NTP服务器同步时间。
首先设置Wifi连接，才能够连上wifi，这个在设置菜单里有，官方教程有详细介绍。
https://docs.m5stack.com/#/en/quick_start/m5core/m5stack_core_get_started_MicroPython
设置好wifi之后，就可以在MicroPython中连接wifi了。
在MicroPython代码中连上wifi的语句是：
import wifisetup
wifisetup.auto_connect()
注意：这里如果在REPL执行会暴露SSID和相对应的密码。
连接wifi成功之后就可以和NTP服务器同步时间啦。
>>> rtc = machine.RTC()
>>> rtc.ntp_sync(server = "ntp.aliyun.com",tz='CST-8')
>>> rtc.synced()
False
>>> rtc.synced()
True
>>> time.gmtime()
(2019, 6, 9, 11, 5, 45, 1, 160)
>>> time.localtime()
(2019, 6, 9, 19, 5, 45, 1, 160)
>>> time.strftime('%Y/%m/%d %H:%M:%S',time.localtime())
'2019/06/09 19:05:46'
>>>
- 上面NTP服务器用的是阿里云的NTP服务器，也可以用其他的，只要稳定工作连接可靠的服务器即可。NTP服务器网上一搜一大把。
- tz='CST-8’的意思是，当前时间为CST（中国标准时），格林威治时间比当前时区的时间延后8个小时。
- rtc.synced()可以检查是否已同步
- time.gmtime()是GMT时间
- time.localtime()是当前时区的时间
- time.strftime可以得到格式化的时间字符串
M5Stack可以有准确时间后，我就把上次记录温度的程序改了下，加入了准确时间的数据。保存数据的文件名也以启动程序时的日期时间命名。
from m5stack import *
from m5ui import *
import units
import wifisetup
wifisetup.auto_connect()
rtc = machine.RTC()
rtc.ntp_sync(server = "ntp.aliyun.com",tz='CST-8')
while not rtc.synced():
print("Waiting time synced with NTC server.")
wait(0.2)
clear_bg(0x0)
env0 = units.ENV(units.PORTA)
flag_rec = False
flag_disp = True
inteval = 30 # seconds
filename = '/sd/' + time.strftime('%Y%m%d_%H%M%S',time.localtime())+'.csv'
if 'sd' in os.listdir('/'):
flag_sd = True
sd_info = 'SD Mounted'
sd_color = 0x00FF00
else:
flag_sd = False
sd_info = 'SD Not Mounted'
sd_color = 0xFFFF00
btnA = M5Button(name="ButtonA", text="Rec", visibility=True)
btnB = M5Button(name="ButtonB", text="SD", visibility=True)
btnC = M5Button(name="ButtonC", text="Display", visibility=True)
label_t = M5TextBox(0, 0, "Text", lcd.FONT_DejaVu24,0xFFFFFF, rotate=0)
label_h = M5TextBox(0, 25, "Text", lcd.FONT_DejaVu24,0xFFFFFF, rotate=0)
label_p = M5TextBox(0, 50, "Text", lcd.FONT_DejaVu24,0xFFFFFF, rotate=0)
label_s = M5TextBox(0, 100, "REC stopped.", lcd.FONT_DejaVu24,0xFFFF00, rotate=0)
label_mt = M5TextBox(0, 150, sd_info, lcd.FONT_DejaVu24, 0xFFFF00, rotate=0)
def buttonA_pressed():
# Rec Start/Stop
global flag_disp
global flag_rec
global flag_sd
if flag_disp and flag_sd:
if flag_rec:
flag_rec = False
label_s.setText("REC stopped.")
label_s.setColor(0xFFFF00)
else:
flag_rec = True
label_s.setText("REC started.")
label_s.setColor(0xFF0000)
def buttonC_pressed():
# Display On/Off
global flag_disp
if flag_disp:
flag_disp = False
clear_bg(0x0)
lcd.setBrightness(0)
else:
flag_disp = True
lcd.setBrightness(50)
clear_bg(0x222222)
label_t.show()
label_h.show()
label_p.show()
label_s.show()
label_mt.show()
def buttonB_pressed():
# Display On/Off
global flag_disp
global flag_sd
global flag_rec
if flag_disp:
if flag_sd and (not flag_rec):
flag_sd = False
label_mt.setText("SD Not Mounted")
label_mt.setColor(0xFFFF00)
os.umountsd()
else:
flag_sd = True
label_mt.setText("SD Mounted")
label_mt.setColor(0x00FF00)
os.mountsd()
def save_tofile(rec_string):
f = open(filename,'a+')
f.write(rec_string)
f.close()
buttonA.wasPressed(callback = buttonA_pressed)
buttonC.wasPressed(callback = buttonC_pressed)
buttonB.wasPressed(callback = buttonB_pressed)
timesec_start = round(time.time())
time_tick = timesec_start - inteval
#save_tofile("SEC,TEMP,HUMI,PRES\n")
while True:
label_t.setText("TEMP: " + str(env0.temperature()))
label_h.setText("HUMI: " + str(env0.humidity()))
label_p.setText("PRES: " + str(env0.pressure()))
if flag_rec:
if time.time() - time_tick >= inteval:
save_tofile("%s,%s,%s,%s\n" % (time.strftime('%Y/%m/%d %H:%M:%S',time.localtime()), str(env0.temperature()), str(env0.humidity()), str(env0.pressure())))
time_tick = time.time()
wait(1)