diff --git a/DS1307_/README.md b/DS1307_/README.md
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+
+
+# 时钟模块
+
+## 案例展示
+![](img/20210716185257.jpg)
+
+## 物理连接
+
+### 传感器选择 
+
+![](img/20210716185325.jpg)
+
+   传感器选择如下图所示的型号为DS1307的实时时钟传感器模组。
+
+### 传感器接线 
+
+  传感器与Waffle Nano 之间的接线方式如下表所示，且未在下表中显示的引脚均处于悬空不连装态。
+
+| Waffle Nano |      |
+| ----------- | ---- |
+| 3.3         | VCC  |
+| IO0         | SDA  |
+| IO1         | SCL  |
+| GND         | GND  |
+
+## 传感器库使用
+
+​		可以获取[DS1307.py](https://gitee.com/blackwalnutlabs/waffle-nano-v1-sensor-lib/blob/master/DS1307_/code/DS1307.py),将此库通过[Waffle Maker](https://wafflenano.blackwalnut.tech/ide/index.html#/editor) 的文件上传功能将此库上传到`Waffle Nano`上。
+
+  我们在可以在主函数中使用以下代码导入此库。
+
+```
+import DS1307
+```
+
+  在对象构造函数中，我们需要传入一个已经构造好的`IIC`对象。
+
+```
+# 此处省略IIC对象的构造过程
+ds = DS1307.DS1307(i2c) #构造实时时钟对象
+```
+
+  我们使用实时时钟对象的datetime()方法读取出一个含有八个元素的元组。
+
+```
+current = ds.datetime() #从实时时钟中获取数据
+```
+
+  关于此库相关细节说明详见代码注释
+
+## 案例代码复现
+
+  可以获取[main.py](https://gitee.com/blackwalnutlabs/waffle-nano-v1-sensor-lib/blob/master/DS1307_/code/main.py)函数，将其内容复制到[Waffle Maker](https://wafflenano.blackwalnut.tech/ide/index.html#/editor) 编辑器上传输给`Waffle Nano`，以复现此案例。
+
+  案例相关细节说明详见代码注释
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diff --git a/DS1307_/code/DS1307.py b/DS1307_/code/DS1307.py
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+from micropython import const
+
+DATETIME_REG = const(0) # 0x00-0x06
+CHIP_HALT    = const(128)
+CONTROL_REG  = const(7) # 0x07
+RAM_REG      = const(8) # 0x08-0x3F
+
+class DS1307(object):
+    """Driver for the DS1307 RTC."""
+    def __init__(self, i2c, addr=0x68):
+        self.i2c = i2c
+        self.addr = addr
+        self.weekday_start = 1
+        self._halt = False
+
+    def _dec2bcd(self, value):
+        """Convert decimal to binary coded decimal (BCD) format"""
+        return (value // 10) << 4 | (value % 10)
+
+    def _bcd2dec(self, value):
+        """Convert binary coded decimal (BCD) format to decimal"""
+        return ((value >> 4) * 10) + (value & 0x0F)
+
+    def datetime(self, datetime=None):
+        """Get or set datetime"""
+        if datetime is None:
+            buf = self.i2c.readfrom_mem(self.addr, DATETIME_REG, 7)
+            return (
+                self._bcd2dec(buf[6]) + 2000, # year
+                self._bcd2dec(buf[5]), # month
+                self._bcd2dec(buf[4]), # day
+                self._bcd2dec(buf[3] - self.weekday_start), # weekday
+                self._bcd2dec(buf[2]), # hour
+                self._bcd2dec(buf[1]), # minute
+                self._bcd2dec(buf[0] & 0x7F), # second
+                0 # subseconds
+            )
+        buf = bytearray(7)
+        buf[0] = self._dec2bcd(datetime[6]) & 0x7F # second, msb = CH, 1=halt, 0=go
+        buf[1] = self._dec2bcd(datetime[5]) # minute
+        buf[2] = self._dec2bcd(datetime[4]) # hour
+        buf[3] = self._dec2bcd(datetime[3] + self.weekday_start) # weekday
+        buf[4] = self._dec2bcd(datetime[2]) # day
+        buf[5] = self._dec2bcd(datetime[1]) # month
+        buf[6] = self._dec2bcd(datetime[0] - 2000) # year
+        if (self._halt):
+            buf[0] |= (1 << 7)
+        self.i2c.writeto_mem(self.addr, DATETIME_REG, buf)
+
+    def halt(self, val=None):
+        """Power up, power down or check status"""
+        if val is None:
+            return self._halt
+        reg = self.i2c.readfrom_mem(self.addr, DATETIME_REG, 1)[0]
+        if val:
+            reg |= CHIP_HALT
+        else:
+            reg &= ~CHIP_HALT
+        self._halt = bool(val)
+        self.i2c.writeto_mem(self.addr, DATETIME_REG, bytearray([reg]))
+
+    def square_wave(self, sqw=0, out=0):
+        """Output square wave on pin SQ at 1Hz, 4.096kHz, 8.192kHz or 32.768kHz,
+        or disable the oscillator and output logic level high/low."""
+        rs0 = 1 if sqw == 4 or sqw == 32 else 0
+        rs1 = 1 if sqw == 8 or sqw == 32 else 0
+        out = 1 if out > 0 else 0
+        sqw = 1 if sqw > 0 else 0
+        reg = rs0 | rs1 << 1 | sqw << 4 | out << 7
+        self.i2c.writeto_mem(self.addr, CONTROL_REG, bytearray([reg]))
diff --git a/DS1307_/code/main.py b/DS1307_/code/main.py
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+'''传入库'''
+from machine import I2C, Pin,SPI
+import utime
+import st7789
+import ds1307
+
+'''创建对象'''
+i2c = I2C(1, sda=Pin(0), scl=Pin(1),freq=400000)
+ds = ds1307.DS1307(i2c)
+
+'''屏幕的初始化'''
+spi = SPI(0, baudrate=40000000, polarity=1, phase=0, bits=8, endia=0, sck=Pin(6), mosi=Pin(8))
+display = st7789.ST7789(spi, 240, 240, reset=Pin(11,func=Pin.GPIO, dir=Pin.OUT), dc=Pin(7,func=Pin.GPIO, dir=Pin.OUT))
+display.init()
+display.draw_string(50, 230, "Powered by BlackWalnuut Labs.")
+
+'''将屏幕背景渲染为白色'''
+display.fill(st7789.color565(255, 255, 255))
+
+
+while True:
+    current = ds.datetime()  #获取当下的时刻元组
+    year = current[0]+21  #获取年份
+    month = current[1]  #获取月份
+    day = current[2]  #获取日期
+    date = current[3]  #获取星期
+    hour = current[4]  #获取小时
+    minute = current[5]  #获取分钟
+    second = current[6]  #获取秒
+    former = "%04d/%02d/%02d" % (year,month,day)  #格式化具体某一天
+    later = "%02d:%02d:%02d" % (hour,minute,second)  #格式化一天当中的时刻
+    #将当下时刻累计的步数输出在显示屏上
+    display.draw_string(10, 10,former,size=3,color=st7789.color565(0, 0, 0))
+    display.draw_string(10, 40,later,size=3,color=st7789.color565(0, 0, 0))
+    utime.sleep(1)  #一秒获取一次时刻
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