在网上查了很多的资料，打算做一个可以按键显示网络时间和天气预报的东西。
手头有WeMos nodeMCU和I2C接口的OLED12864，不打算用时钟模块，因为ESP8266可以上网，完全可以借用网络授时服务器的数据嘛。http://worldtimeapi.org/api/timezone/Asia/Hong_Kong
OLED12864 I2C这里我采用官方版本的驱动
https://github.com/micropython/micropython/tree/master/drivers/display
保存至 /lib文件夹下，然后在根目录下建立文件
from machine import Pin, I2C
from ssd1306 import SSD1306_I2C
import network
import time
net=network.WLAN(network.STA_IF)
if not net.isconnected():
net.active(True)
net.connect("YourWifi","KeyWords") #你的Wifi和密码
while not net.isconnected():
time.sleep(1)
scl=Pin(12,Pin.OUT)
sda=Pin(14,Pin.OUT)
i2c=I2C(scl=scl,sda=sda)
oled=SSD1306_I2C(128, 64, i2c)
oled.fill(0)
oled.text("Hello World",0,0)
oled.show()
先测试一下，让OLED12864出现文字再说。
参考一个完整的网络时钟代码
ESP32+时钟、闹钟、温度+microPython程序 (2020-10-09） - 简书
接下来解决网络天气问题。在
http://wthrcdn.etouch.cn/weather_mini?citykey=101010100
这个网站可以获取天气实况，有预报功能。没有成功。
还有国外的 天气网站 https://openweathermap.org/city/1799397 这个也可以用，自己第一次测试成功，后来失败，是因为密钥问题。
在这个环节使用完整版的python有很多中方案都是成功的，但是因为是阉割版的Micropython，其中的urequests不是很完整，用别的网站在urequests.get(url)环节总是返回 UnicodeError错误，就是urequests中的问题。
最后还是回到国内网站，在知心天气注册免费的账户获得一个私钥，获取免费天气预报。
import network
import urequests
import ujson
import utime
import ssd1306
import machine
from machine import RTC, I2C, Pin
# user data
ssid = "yourWifi" # wifi router name
pw = "yourkey" # wifi router password
# initialization
# SSD1306 OLED display
print("Connecting to wifi...")
oled = ssd1306.SSD1306_I2C(128, 64, I2C(scl=Pin(12), sda=Pin(14)))
oled.fill(0)
oled.text("Connecting", 0, 5)
oled.text(" to wifi...", 0, 15)
oled.show()
# wifi connection
wifi = network.WLAN(network.STA_IF) # station mode
wifi.active(True)
wifi.connect(ssid, pw)
# wait for connection
while not wifi.isconnected():
pass
# wifi connected
print("IP: " + str(wifi.ifconfig()[0]) + "\n")
oled.text("Connected. IP: ", 0, 35)
oled.text(" " + str(wifi.ifconfig()[0]), 0, 45)
oled.show()
url = 'https://api.seniverse.com/v3/weather/daily.json?key=yourkey&location=city&language=en&unit=c&start=0&days=5'
oled.fill(0)
oled.show()
def weather_(_):
result = urequests.get(url)
if not wifi.isconnected():
machine.reset()
j = ujson.loads(result.text)
for i in range(3):
city=j['results'][0]['location']['name']
oled.text(city+" weather", 0, 0)
date=j['results'][0]['daily'][i]['date']
oled.text("Date "+date, 0, 9)
tianqi='D/N:'+j['results'][0]['daily'][i]['text_day']+'/'+j['results'][0]['daily'][i]['text_night']
oled.text(tianqi, 0, 20)
high=j['results'][0]['daily'][i]['high']+' deg'
low=j['results'][0]['daily'][i]['low']+' deg'
oled.text('Low:'+low, 0, 29)
oled.text('High:'+high, 0, 37)
shidu=j['results'][0]['daily'][i]["humidity"]
oled.text('Humidity:'+shidu+'%', 0, 50)
oled.show()
utime.sleep(5)
oled.fill(0)
oled.show()
result.close()
button1 = Pin(4, Pin.IN, Pin.PULL_UP)
button1.irq(trigger=Pin.IRQ_FALLING, handler=weather_)
#以上是显示天气的程序
web_query_delay = 60000 # interval time of web JSON query
retry_delay = 5000 # interval time of retry after a failed Web query
url2 = 'http://worldtimeapi.org/api/timezone/Asia/Hong_Kong'
# internal real time clock
rtc = RTC()
def webtime_(_):
oled.fill(0)
oled.show()
# set timer
for i in range(15):
update_time = utime.ticks_ms() - web_query_delay
if not wifi.isconnected():
machine.reset()
# query and get web JSON every web_query_delay ms
if utime.ticks_ms() - update_time >= web_query_delay:
# HTTP GET data
response = urequests.get(url2)
if response.status_code == 200: # query success
# parse JSON
parsed = ujson.loads(response.text)
# you can also use parsed = response.json()
datetime_str = str(parsed["datetime"])
year = int(datetime_str[0:4])
month = int(datetime_str[5:7])
day = int(datetime_str[8:10])
hour = int(datetime_str[11:13])
minute = int(datetime_str[14:16])
second = int(datetime_str[17:19])
subsecond = int(round(int(datetime_str[20:26]) / 10000))
# update internal RTC
rtc.datetime((year, month, day, 0, hour, minute, second, subsecond))
update_time = utime.ticks_ms()
print("RTC updated\n")
else: # query failed, retry retry_delay ms later
update_time = utime.ticks_ms() - web_query_delay + retry_delay
# generate formated date/time strings from internal RTC
date_str = "{:02}/{:02}/{:4}".format(rtc.datetime()[1], rtc.datetime()[2], rtc.datetime()[0])
time_str = "{:02}:{:02}:{:02}".format(rtc.datetime()[4], rtc.datetime()[5], rtc.datetime()[6])
# update SSD1306 OLED display
oled.fill(0)
oled.text("ESP8266 Clock", 0, 5)
oled.text("Date: " + date_str, 0, 25)
oled.text("Time: " + time_str, 0, 45)
oled.show()
utime.sleep(0.1)
oled.fill(0)
oled.show()
response.close()
button2 = Pin(5, Pin.IN, Pin.PULL_UP)
button2.irq(trigger=Pin.IRQ_FALLING, handler=webtime_)
while True:
pass
这里用两个按键控制，分别通过引脚中断调用两个函数，注意这里的button2 = Pin(5, Pin.IN, Pin.PULL_UP)是GPIO编号不是D5.
在获取知心天气的网页地址中 url = 'https://api.seniverse.com/v3/weather/daily.json?key=yourkey&location=city&language=en&unit=c&start=0&days=5' 把yourkey换成你的私钥，city换成你的城市。这里之所以选择language=en是为了方便显示，如果用默认的language=zh-Hans显示汉字的话，在OLED中还需要构建字模，挺麻烦的，以后有机会再说。
在获取时间时使用的是香港时间，因为和北京位于一个时区，时间是一样的 url2 = 'http://worldtimeapi.org/api/timezone/Asia/Hong_Kong'
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