【MicroPython ESP32】ssd1306 0.96“OLED+网络时钟
【MicroPython ESP32】ssd1306 0.96"OLED+网络时钟
- 本示例基于
Thonny平台开发。 - 显示效果
显示部分
- 使用
ssd 13060.96" OLED屏幕来显示时间。 - 接线说明:
0.96"OLED ----ESP32
SCL ---- 22
SDA ---- 21
- 运行调试代码前，需要将
ssd1306.py保存到micropython设备上，在运行主代码。
ssd1306模块下载地址：:
- 中文下载站：
https://www.cnpython.com/pypi/micropython-ssd1306/download - 官方下载站：
https://pypi.org/project/micropython-ssd1306/ ssd1306.py代码如下;(拷贝下来保存为ssd1306.py到MicroPython设备上)
# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
from micropython import const
import framebuf
# register definitions
SET_CONTRAST = const(0x81)
SET_ENTIRE_ON = const(0xA4)
SET_NORM_INV = const(0xA6)
SET_DISP = const(0xAE)
SET_MEM_ADDR = const(0x20)
SET_COL_ADDR = const(0x21)
SET_PAGE_ADDR = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP = const(0xA0)
SET_MUX_RATIO = const(0xA8)
SET_COM_OUT_DIR = const(0xC0)
SET_DISP_OFFSET = const(0xD3)
SET_COM_PIN_CFG = const(0xDA)
SET_DISP_CLK_DIV = const(0xD5)
SET_PRECHARGE = const(0xD9)
SET_VCOM_DESEL = const(0xDB)
SET_CHARGE_PUMP = const(0x8D)
# Subclassing FrameBuffer provides support for graphics primitives
# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
class SSD1306(framebuf.FrameBuffer):
def __init__(self, width, height, external_vcc):
self.width = width
self.height = height
self.external_vcc = external_vcc
self.pages = self.height // 8
self.buffer = bytearray(self.pages * self.width)
super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB, self.width)
self.init_display()
def init_display(self):
for cmd in (
SET_DISP | 0x00, # off
# address setting
SET_MEM_ADDR,
0x00, # horizontal
# resolution and layout
SET_DISP_START_LINE | 0x00,
SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0
SET_MUX_RATIO,
self.height - 1,
SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0
SET_DISP_OFFSET,
0x00,
SET_COM_PIN_CFG,
0x02 if self.width > 2 * self.height else 0x12,
# timing and driving scheme
SET_DISP_CLK_DIV,
0x80,
SET_PRECHARGE,
0x22 if self.external_vcc else 0xF1,
SET_VCOM_DESEL,
0x30, # 0.83*Vcc
# display
SET_CONTRAST,
0xFF, # maximum
SET_ENTIRE_ON, # output follows RAM contents
SET_NORM_INV, # not inverted
# charge pump
SET_CHARGE_PUMP,
0x10 if self.external_vcc else 0x14,
SET_DISP | 0x01,
): # on
self.write_cmd(cmd)
self.fill(0)
self.show()
def poweroff(self):
self.write_cmd(SET_DISP | 0x00)
def poweron(self):
self.write_cmd(SET_DISP | 0x01)
def contrast(self, contrast):
self.write_cmd(SET_CONTRAST)
self.write_cmd(contrast)
def invert(self, invert):
self.write_cmd(SET_NORM_INV | (invert & 1))
def show(self):
x0 = 0
x1 = self.width - 1
if self.width == 64:
# displays with width of 64 pixels are shifted by 32
x0 += 32
x1 += 32
self.write_cmd(SET_COL_ADDR)
self.write_cmd(x0)
self.write_cmd(x1)
self.write_cmd(SET_PAGE_ADDR)
self.write_cmd(0)
self.write_cmd(self.pages - 1)
self.write_data(self.buffer)
class SSD1306_I2C(SSD1306):
def __init__(self, width, height, i2c, addr=0x3C, external_vcc=False):
self.i2c = i2c
self.addr = addr
self.temp = bytearray(2)
self.write_list = [b"\x40", None] # Co=0, D/C#=1
super().__init__(width, height, external_vcc)
def write_cmd(self, cmd):
self.temp[0] = 0x80 # Co=1, D/C#=0
self.temp[1] = cmd
self.i2c.writeto(self.addr, self.temp)
def write_data(self, buf):
self.write_list[1] = buf
self.i2c.writevto(self.addr, self.write_list)
class SSD1306_SPI(SSD1306):
def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
self.rate = 10 * 1024 * 1024
dc.init(dc.OUT, value=0)
res.init(res.OUT, value=0)
cs.init(cs.OUT, value=1)
self.spi = spi
self.dc = dc
self.res = res
self.cs = cs
import time
self.res(1)
time.sleep_ms(1)
self.res(0)
time.sleep_ms(10)
self.res(1)
super().__init__(width, height, external_vcc)
def write_cmd(self, cmd):
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
self.cs(1)
self.dc(0)
self.cs(0)
self.spi.write(bytearray([cmd]))
self.cs(1)
def write_data(self, buf):
self.spi.init(baudrate=self.rate, polarity=0, phase=0)
self.cs(1)
self.dc(1)
self.cs(0)
self.spi.write(buf)
self.cs(1)
实例代码
# ESP32 MicroPython Web Clock
import network
import urequests
import ujson
import utime
from ssd1306 import SSD1306_I2C #从ssd1306模块中导入SSD1306_I2C子模块
from machine import RTC, I2C, Pin
# user data
ssid = "MERCURY_D268G" # wifi router name
pw = "pba5ayzk" # wifi router password
url = 'http://worldtimeapi.org/api/timezone/Asia/Hong_Kong'
web_query_delay = 60000 # interval time of web JSON query
retry_delay = 5000 # interval time of retry after a failed Web query
# SSD1306 OLED display
print("Connecting to wifi...")
i2c = I2C(1,sda=Pin(21), scl=Pin(22),freq=100000)
oled = SSD1306_I2C(128, 64, i2c,addr=0x3c)
oled.fill(0)
oled.text("Connecting", 0, 0)
oled.text(" to wifi...", 15, 16)
oled.show()
# internal real time clock
rtc = RTC()
# wifi connection
wifi = network.WLAN(network.STA_IF) # station mode
while(not wifi.isconnected()):
wifi.active(True)
try:
wifi.connect(ssid,pw) # wifi网络信息
utime.sleep(1.0)
except OSError:
print("OSError")
utime.sleep(2.0)
# wifi connected
print("IP: " + str(wifi.ifconfig()[0]) + "\n")
oled.text("Connected. IP: ", 0, 30)
oled.text(" " + str(wifi.ifconfig()[0]), 0, 45)
oled.show()
# set timer
update_time = utime.ticks_ms() - web_query_delay
# main loop
while True:
# if lose wifi connection reboot ESP32
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(url)
if response.status_code == 200: # query success
print("JSON response:\n" + response.text)
# 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("ESP32 Clock", 20, 0)
oled.line(0, 14, 128, 14, 1)#划线
oled.text("Date: " + date_str, 0, 25)
oled.text("Time: " + time_str, 0, 45)
oled.show()
utime.sleep(0.1)
更换API接口
- 苏宁API接口：
http://quan.suning.com/getSysTime.do
省掉了毫秒的精度，但是获取比较简单。
# ESP32 MicroPython Web Clock
import urequests
import network
#import urequests
import ujson
import utime
from ssd1306 import SSD1306_I2C #从ssd1306模块中导入SSD1306_I2C子模块
from machine import RTC, I2C, Pin
# user data
ssid = "MERCURY_D268G" # wifi router name
pw = "pba5ayzk" # wifi router password
#url = 'http://worldtimeapi.org/api/timezone/Asia/Hong_Kong'
url ='http://quan.suning.com/getSysTime.do'
'''
{"sysTime2":"2022-08-21 13:31:51","sysTime1":"20220821133151"}
'''
web_query_delay = 60000 # interval time of web JSON query
retry_delay = 5000 # interval time of retry after a failed Web query
# SSD1306 OLED display
print("Connecting to wifi...")
i2c = I2C(1,sda=Pin(21), scl=Pin(22),freq=100000)
oled = SSD1306_I2C(128, 64, i2c,addr=0x3c)
oled.fill(0)
oled.text("Connecting", 0, 0)
oled.text(" to wifi...", 15, 16)
oled.show()
# internal real time clock
rtc = RTC()
# wifi connection
wifi = network.WLAN(network.STA_IF) # station mode
while(not wifi.isconnected()):
wifi.active(True)
try:
wifi.connect(ssid,pw) # wifi网络信息
utime.sleep(1.0)
except OSError:
print("OSError")
utime.sleep(2.0)
# wifi connected
print("IP: " + str(wifi.ifconfig()[0]) + "\n")
oled.text("Connected. IP: ", 0, 30)
oled.text(" " + str(wifi.ifconfig()[0]), 0, 45)
oled.show()
# set timer
update_time = utime.ticks_ms() - web_query_delay
# main loop
while True:
# if lose wifi connection reboot ESP32
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 1分钟更新一次
response = urequests.get(url)
if response.status_code == 200: # query success
print("JSON response:\n" + response.text)
# parse JSON
parsed = ujson.loads(response.text)
# you can also use parsed = response.json()
datetime_str = str(parsed["sysTime2"])
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))# 忽略毫秒
# update internal RTC
rtc.datetime((year, month, day, 0, hour, minute, second, 0))
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("ESP32 Clock", 20, 0)
oled.line(0, 14, 128, 14, 1)#划线
oled.text("Date: " + date_str, 0, 25)
oled.text("Time: " + time_str, 0, 45)
oled.show()
utime.sleep(0.1)
- Shell调试窗口输出信息
