diff --git a/README.md b/README.md
index fcd094c..1c44510 100644
--- a/README.md
+++ b/README.md
@@ -360,3 +360,33 @@ import machine
 adc = machine.ADC(35)
 adc.read()
 ```
+
+
+## **I2C**
+
+---
+```python
+from machine import I2C
+
+i2c = I2C(freq=400000)          # create I2C peripheral at frequency of 400kHz
+                                # depending on the port, extra parameters may be required
+                                # to select the peripheral and/or pins to use
+
+i2c.scan()                      # scan for slaves, returning a list of 7-bit addresses
+
+i2c.writeto(42, b'123')         # write 3 bytes to slave with 7-bit address 42
+i2c.readfrom(42, 4)             # read 4 bytes from slave with 7-bit address 42
+
+i2c.readfrom_mem(42, 8, 3)      # read 3 bytes from memory of slave 42,
+                                #   starting at memory-address 8 in the slave
+i2c.writeto_mem(42, 2, b'\x10') # write 1 byte to memory of slave 42
+                                #   starting at address 2 in the slave
+```
+## **SPI**
+
+---
+
+
+## **UART**
+
+---
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diff --git a/examples/DHT12/dht12.py b/examples/DHT12/dht12.py
new file mode 100644
index 0000000..7a5e925
--- /dev/null
+++ b/examples/DHT12/dht12.py
@@ -0,0 +1,28 @@
+"""
+MicroPython Aosong DHT12 I2C driver
+"""
+
+class DHTBaseI2C:
+    def __init__(self, i2c=None, addr=0x5c):
+        if i2c == None:
+            from machine import I2C
+            self.i2c = I2C()
+        else:
+            self.i2c = i2c
+        self.addr = addr
+        self.buf = bytearray(5)
+    def measure(self):
+        buf = self.buf
+        self.i2c.readfrom_mem_into(self.addr, 0, buf)
+        if (buf[0] + buf[1] + buf[2] + buf[3]) & 0xff != buf[4]:
+            raise Exception("checksum error")
+
+class DHT12(DHTBaseI2C):
+    def humidity(self):
+        return self.buf[0] + self.buf[1] * 0.1
+
+    def temperature(self):
+        t = self.buf[2] + (self.buf[3] & 0x7f) * 0.1
+        if self.buf[3] & 0x80:
+            t = -t
+        return t
\ No newline at end of file
diff --git a/examples/DHT12/main.py b/examples/DHT12/main.py
new file mode 100644
index 0000000..78bbf40
--- /dev/null
+++ b/examples/DHT12/main.py
@@ -0,0 +1,8 @@
+import dht12, time
+sensor = dht12.DHT12()
+
+while True:
+    sensor.measure()
+    print("Temperature:%.2f" % (sensor.temperature()))
+    print("Humidity:%.2f \n" % (sensor.humidity()))
+    time.sleep(1)
\ No newline at end of file
diff --git a/examples/DigitalClock/clock.py b/examples/DigitalClock/clock.py
new file mode 100644
index 0000000..f3f36cf
--- /dev/null
+++ b/examples/DigitalClock/clock.py
@@ -0,0 +1,16 @@
+from m5stack import *
+import time, _thread
+
+def clock():
+    lcd.clear()
+    lcd.font(lcd.FONT_7seg, fixedwidth=True, dist=16, width=2)
+    lcd.setBrightness(200)
+    
+    while True:
+        d = time.strftime("%Y-%m-%d", time.localtime())
+        t = time.strftime("%H:%M:%S", time.localtime())
+        lcd.print(d, lcd.CENTER, 50, lcd.ORANGE)
+        lcd.print(t, lcd.CENTER, 130, lcd.ORANGE)
+        time.sleep(1)
+
+_thread.start_new_thread('Clock', clock, ())
\ No newline at end of file
diff --git a/examples/DigitalClock/main.py b/examples/DigitalClock/main.py
new file mode 100644
index 0000000..aaf9059
--- /dev/null
+++ b/examples/DigitalClock/main.py
@@ -0,0 +1,2 @@
+from m5stack import *
+import clock
\ No newline at end of file
diff --git a/examples/FACES/faces.py b/examples/FACES/faces.py
new file mode 100644
index 0000000..ef644e1
--- /dev/null
+++ b/examples/FACES/faces.py
@@ -0,0 +1,25 @@
+"""
+M5Stack MicroPython FACES keyboard I2C driver
+"""
+
+class Faces:
+  def __init__(self):
+    from machine import I2C
+    self.i2c = I2C()
+    self.addr = 0x08
+    self.cb = None
+
+  def read(self):
+    return self.i2c.readfrom(self.addr, 1)
+
+  def _callback(self, pin):
+    from machine import Pin
+    if pin == Pin(5):
+      self.cb(self.read())
+      
+  def callback(self, cb):
+    from machine import Pin
+    self.pin = Pin(5)
+    self.pin.init(Pin.IN)
+    self.pin.irq(trigger=Pin.IRQ_FALLING, handler=self._callback)
+    self.cb = cb
diff --git a/examples/FACES/main.py b/examples/FACES/main.py
new file mode 100644
index 0000000..77fe317
--- /dev/null
+++ b/examples/FACES/main.py
@@ -0,0 +1,16 @@
+from m5stack import *
+import faces
+
+keyboard = faces.Faces()
+
+# read once
+print("Key value:", end='')
+print(keyboard.read())
+
+# callback
+def keyboard_cb(value):
+  print("Key value:", end='')
+  print(value)
+  lcd.print(value)
+
+keyboard.callback(keyboard_cb)
\ No newline at end of file
diff --git a/examples/clock.py b/examples/clock.py
deleted file mode 100644
index dd32689..0000000
--- a/examples/clock.py
+++ /dev/null
@@ -1,12 +0,0 @@
-from m5stack import *
-import time
-
-lcd.font(lcd.FONT_7seg, fixedwidth=True, dist=16, width=2)
-lcd.setBrightness(200)
-
-while True:
-    d = time.strftime("%Y-%m-%d", time.localtime())
-    t = time.strftime("%H:%M:%S", time.localtime())
-    lcd.print(d, lcd.CENTER, 50, lcd.ORANGE)
-    lcd.print(t, lcd.CENTER, 130, lcd.ORANGE)
-    time.sleep(1)
\ No newline at end of file
diff --git a/examples/main.py b/examples/main.py
deleted file mode 100644
index 694e2fa..0000000
--- a/examples/main.py
+++ /dev/null
@@ -1 +0,0 @@
-import clock
diff --git a/firmwares/m5cloud-20180102-v0.2.5.bin b/firmwares/m5cloud-20180102-v0.2.5.bin
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index 0000000..3bf2e51
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diff --git a/firmwares/m5cloud-psram-20180102-v0.2.5.bin b/firmwares/m5cloud-psram-20180102-v0.2.5.bin
new file mode 100644
index 0000000..2988724
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diff --git a/lib/dht12.py b/lib/dht12.py
new file mode 100644
index 0000000..7a5e925
--- /dev/null
+++ b/lib/dht12.py
@@ -0,0 +1,28 @@
+"""
+MicroPython Aosong DHT12 I2C driver
+"""
+
+class DHTBaseI2C:
+    def __init__(self, i2c=None, addr=0x5c):
+        if i2c == None:
+            from machine import I2C
+            self.i2c = I2C()
+        else:
+            self.i2c = i2c
+        self.addr = addr
+        self.buf = bytearray(5)
+    def measure(self):
+        buf = self.buf
+        self.i2c.readfrom_mem_into(self.addr, 0, buf)
+        if (buf[0] + buf[1] + buf[2] + buf[3]) & 0xff != buf[4]:
+            raise Exception("checksum error")
+
+class DHT12(DHTBaseI2C):
+    def humidity(self):
+        return self.buf[0] + self.buf[1] * 0.1
+
+    def temperature(self):
+        t = self.buf[2] + (self.buf[3] & 0x7f) * 0.1
+        if self.buf[3] & 0x80:
+            t = -t
+        return t
\ No newline at end of file
diff --git a/lib/faces.py b/lib/faces.py
new file mode 100644
index 0000000..ef644e1
--- /dev/null
+++ b/lib/faces.py
@@ -0,0 +1,25 @@
+"""
+M5Stack MicroPython FACES keyboard I2C driver
+"""
+
+class Faces:
+  def __init__(self):
+    from machine import I2C
+    self.i2c = I2C()
+    self.addr = 0x08
+    self.cb = None
+
+  def read(self):
+    return self.i2c.readfrom(self.addr, 1)
+
+  def _callback(self, pin):
+    from machine import Pin
+    if pin == Pin(5):
+      self.cb(self.read())
+      
+  def callback(self, cb):
+    from machine import Pin
+    self.pin = Pin(5)
+    self.pin.init(Pin.IN)
+    self.pin.irq(trigger=Pin.IRQ_FALLING, handler=self._callback)
+    self.cb = cb