diff --git a/docs/zh_CN/api/lcd.md b/docs/zh_CN/api/lcd.md
index 80049756..31ac839c 100644
--- a/docs/zh_CN/api/lcd.md
+++ b/docs/zh_CN/api/lcd.md
@@ -1608,7 +1608,7 @@ img.deleteSprite();
 
 **功能:**
 
-加载自己的字体
+加载字体
 
 **函数原型:**
 
@@ -1633,7 +1633,7 @@ M5.Lcd.loadFont("filename", SD);
 
 **功能:**
 
-使用您自己的字体完成
+卸载字体
 
 **函数原型:**
 
@@ -1714,7 +1714,7 @@ lcd.drawLine(0,0,12,12,lcd.WHITE)
 
 **功能:**
 
-画一个角色
+绘制字符串
 
 **函数原型:**
 
diff --git a/docs/zh_CN/mpy_api/mpy_api_list.md b/docs/zh_CN/mpy_api/mpy_api_list.md
deleted file mode 100644
index e69de29b..00000000
diff --git a/docs/zh_CN/mpy_api/unit.md b/docs/zh_CN/mpy_api/unit.md
index a21126b6..6a8e318c 100644
--- a/docs/zh_CN/mpy_api/unit.md
+++ b/docs/zh_CN/mpy_api/unit.md
@@ -1,21 +1,546 @@
 # unit
 
-```
+>unit模块中包含着M5Stack-Unit系列周边产品的硬件驱动。
+
+## 添加模块
+
+- **函数原型**
+
+```python
 def get(unit, port, *arg)
-
 ```
 
-引入模块
+- 引入模块
+```python
 
-```
 unit.get(unit.JOYSTICK, unit.PORTA)
 ```
 
-卸载模块
-```
+- 卸载模块
+```python
+
 unit.deinit()
 ```
 
-## ADC Unit
+## I2C
+
+### ENV
+
+- *[查看产品详情](zh_CN/unit/env)*
+
+- 设备类型：I2C
+
+- Chip: **dht12, bmp280**
+
+- Addr: ***0x5c***, ***0x76***
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_env = unit.get(unit.ENV, unit.PORTA)
+
+# temperature: -20 ~ 60, Celsius
+tmp = unit_env.temperature
+# humidity: 20 ~ 95, percentage
+hum = unit_env.humidity
+# pressure: 30000 ~ 110000Pa, pa
+pre = unit_env.pressure
+```
+
+### ADC
+
+- *[查看产品详情](zh_CN/unit/adc)*
+
+- Chip: **ADS1100**
+
+- Addr: ***0x48***
+
+``` python
+# init --- Effective IO: PORTA | PORTC
+unit_adc = unit.get(unit.ADC, unit.PORTA)
+
+# get voltage, value range 0~12, measurement: V
+vol = unit_adc.voltage
+```
+
+### ACCEL Unit
+
+- *[查看产品详情](zh_CN/unit/accel)*
+
+- 设备类型：I2C
+
+- Chip: **ADXL345**
+
+- Addr: **0x53**
+
+```python
+adc0 = unit.get(unit.ADC, unit.PORTA)
+
+x = accel0.acceleration[0]
+y = accel0.acceleration[1]
+z = accel0.acceleration[2]
+```
+
+### DAC
+
+- *[查看产品详情](zh_CN/unit/dac)*
+
+- Chip: **ADS1100**
+
+- Addr: ***0x48***
+
+```python
+# init --- Effective IO: PORTA
+unit_dac = unit.get(unit.DAC, unit.PORTA)
+
+# data: 0~4096, maybe 2640 output is 3.3V, max is 3.7V
+# save: True or False, whether to save to eeprom 
+unit_dac.writeData(data, save=False)
+# vol: 0~3.3
+# save: True or False, whether to save to eeprom 
+unit_dac.setVoltage(vol, save=False)
+```
+
+### Ncir
+
+- *[查看产品详情](zh_CN/unit/ncir)*
+
+- Chip: **MLX90614**
+
+- Addr: ***0x5a***
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_ncir = unit.get(unit.NCIR, unit.PORTA)
+# tmp: -70°C ~ 382.2°C
+tmp = unit_ncir.temperature
+```
+
+### Joystick
+
+- *[查看产品详情](zh_CN/unit/joystick)* 
+
+- 设备类型：I2C
+
+- Chip: **ATmega328P**
+
+- Addr: **0x52**
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_joystick = unit.get(unit.JOYSTICK, unit.PORTA)
+# X direction value, 0 ~ 255
+x = unit_joystick.X
+#  X invert direction value, 0 ~ 255
+x = unit_joystick.InvertX
+# Y direction value, 0 ~ 255
+y = unit_joystick.Y
+# Y invert direction value, 0 ~ 255
+y = unit_joystick.InvertY
+# if press, return 1, else 0
+press = unit_joystick.Press
+```
+
+### Tof
+
+- *[查看产品详情](zh_CN/unit/tof)*
+
+- Chip: **VL53L0X**
+
+- Addr: **0x29**
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_tof = unit.get(unit.TOF, unit.PORTA)
+# distance: 30 ~ 800(mm), other is invalid
+distance = unit_tof.distance
+```
+
+### Color
+
+- *[查看产品详情](zh_CN/unit/color)*
+
+- Chip: **TCS3472**
+
+- Addr: **0x29**
+
+``` python
+# init --- Effective IO: PORTB
+unit_color = unit.get(unit.COLOR, unit.PORTA)
+
+# return: tuple, like (3521, 1515, 1147, 865), (clear, red, green, blue)
+raw = unit_color.rawData
+
+# return red value, range 0~255
+red = unit_color.red
+# return green value, range 0~255
+unit_color.green
+# return blue value, range 0~255
+unit_color.blue
+```
+
+### Extend IO
+
+- *[查看产品详情](zh_CN/unit/extio)*
+
+- Chip: **PCA9554PW**
+
+- Addr: ***0x27***
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_extIO = unit.get(unit.EXT_IO, unit.PORTA)
+# Method
+# mode: unit_extIO.ALL_OUTPUT or unit_extIO.ALL_INPUT
+unit_extIO.setPortMode(mode)
+# pin: 0~7, mode: 1 or 0, 1:output, 0:INPUT
+unit_extIO.setPinMode(pin, mode)
+# state --> 0x00 ~ 0xff, 
+# 0 pin in 0 bit 7 pin in 7 bit
+# singState = (state >> pin) & 0x01
+state = unit_extIO.digitReadPort()
+# pin: 0~7
+# state --> 0: LOW, 1:HIGH
+state = unit_extIO.digitRead(pin)
+# state: 0x00 ~ 0xff
+unit_extIO.digitWritePort(state)
+# pin: 0 ~ 7, value: 0:LOW, 1:HIGH
+unit_extIO.digitWrite(pin, value)
+```
+
+### RFID
+
+- *[查看产品详情](zh_CN/unit/rfid)*
+
+- Chip: **MFRC522**
+
+- Addr: **0x28**
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_rfid = unit.get(unit.RFID, unit.PORTA)
+# if card near return True, else return False
+state = unit_rfid.isCardOn()
+# return card Uid (string), like '73f66c1bf2'
+# if read fail, return ''
+uid = unit_rfid.readUid()
+# block: must (block + 1) % 4 != 0
+# data: string, int, float, will convert to string
+unit_rfid.writeBlock(block, data)
+# return block data (string)
+dataStr = unit_rfid.readBlockStr(block)
+```
+
+### CardKB
+
+- *[查看产品详情](zh_CN/unit/cardkb)*
+
+- Chip: **ATmega328P**
+
+- Addr: ***0x5F***
+
+```python
+# init --- Effective IO: PORTB
+unit_cardKB = unit.get(unit.CARDKB, unit.PORTA)
+
+# isNewKeyPress() --> if press key return True else False
+  unit_cardKB.isNewKeyPress():
+  # return last press key value at once, type: int  
+  key = unit_cardKB.keyData
+  # return press string, len < 50, press ESC clear, press [X] delete last one
+  keyString = unit_cardKB.keyString
+```
+
+### Tracker
+
+- *[查看产品详情](zh_CN/unit/track)*
+
+- Chip: **ATmega328P**
+
+- Addr: ***0x5a***
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_track = unit.get(unit.TRACK, unit.PORTA)
+# pos: 1, 2, 3, 4
+# value: 0 ~ 1024
+value = unit_track.getAnalogValue(pos)
+# pos: 1, 2, 3, 4
+# value: 0 ~ 1024
+unit_track.setAnalogValue(pos, value)
+# pos: 1, 2, 3, 4
+# value: 0, 1
+value = unit_track.getDigitalValue(pos)
+```
+
+### Makey
+
+- *[查看产品详情](zh_CN/unit/makey)*
+
+- Chip: **ATmega328P**
+
+- Addr: **0x51**
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_makey = unit.get(unit.MAKEY, unit.PORTA)
+# data:-1, 0 ~ 15
+data = unit_makey.value
+```
+
+---------------------------------------
+
+## IO
+
+### PIR
+
+- *[查看产品详情](zh_CN/unit/pir)*
+
+- 设备类型：IO
+
+```python
+# init --- Effective IO: PORTA | PORTB | PORTC
+unit_pir = unit.get(unit.PIR, unit.PORTB)
+# return 0 or 1
+state = pir.state
+```
 
 
+## Button
+
+- *[查看产品详情](zh_CN/unit/button)*
+
+- 设备类型：IO
+
+``` python
+# init --- Effective IO: PORTA | PORTB | PORTC
+unit_btn = unit.get(unit.BUTTON, unit.PORTB)
+
+# Method
+# if set the callback param, it will interrupt callback function
+# or if not set param it will return result(True or False) at once
+unit_btn.wasPressed(callback=None)
+unit_btn.wasReleased(callback=None)
+unit_btn.wasDoublePress(callback=None)
+# holdTime: sec
+unit_btn.pressFor(holdTime=1.0, callback=None):
+
+#example 
+def on_wasPressed():
+  lcd.print('Button was Pressed\n')
+
+def on_wasReleased():
+  lcd.print('Button was Released\n')
+
+def on_pressFor():
+  lcd.print('Button press for 1.2s press hold\n')
+  
+def on_doublePress():
+  lcd.print('Button was double press\n')
+
+unit_btn.wasPressed(on_wasPressed)
+unit_btn.wasReleased(on_wasReleased)
+unit_btn.wasDoublePress(on_doublePress)
+unit_btn.pressFor(1.2, on_pressFor)
+```
+
+## Dual Button
+
+- *[查看产品详情](zh_CN/unit/button)*
+
+- 设备类型：IO
+
+```python
+# init --- Effective IO: PORTA | PORTB | PORTC
+unit_dualButton = unit.get(unit.DUAL_BUTTON, unit.PORTB)
+# btnRed, btnRed method like button unit
+btnRed = unit_dualButton.btnRed
+btnRed = unit_dualButton.btnBlue
+```
+
+
+## Relay
+
+- *[查看产品详情](zh_CN/unit/relay)*
+
+```python
+# init --- Effective IO: PORTA | PORTB | PORTC
+unit_relay = unit.get(unit.RELAY, unit.PORTB)
+# select com connect on
+unit_relay.on()
+# select com connect off
+unit_relay.off()
+```
+
+
+## IR
+
+- *[查看产品详情](zh_CN/unit/ir)*
+
+```python
+# init --- Effective IO: PORTA | PORTB | PORTC
+unit_ir = unit.get(unit.IR, unit.PORTB)
+# ir tx 25hz signal with 38khz signal carrier
+unit_ir.txOn()
+# off tx off
+unit_ir.txOff()
+# if receive ir signal return 1 else return 0
+value = unit.rxStatus()
+```
+
+
+## Angle
+
+Analog Device ( *[查看产品详情](zh_CN/unit/angle)*
+
+``` python
+# init --- Effective IO: PORTB
+unit_angle = unit.get(unit.ANGLE, unit.PORTB)
+
+# get raw value, range 0 ~ 4095
+adValue = unit_angle.readraw()
+
+# get filter value, range 0 ~ 1023
+filterValue = unit_angle.read()
+```
+
+### Light
+
+- *[查看产品详情](zh_CN/unit/light)*
+
+```python
+# init --- Effective IO: PORTB
+unit_light = unit.get(unit.LIGHT, unit.PORTB)
+# adc value, range 0 ~ 1024
+analogValue = unit_light.analogValue
+# digital value, only 0 or 1, base rotate the knob 
+digitalValue = unit_light.digitalValue
+```
+
+### Earth
+
+- *[查看产品详情](zh_CN/unit/light)*
+
+```python
+# init --- Effective IO: PORTB
+unit_earth = unit.get(unit.LIGHT, unit.PORTB)
+# adc value, range 0 ~ 1024
+analogValue = unit_earth.analogValue
+# digital value, only 0 or 1, base rotate the knob 
+digitalValue = unit_earth.digitalValue
+```
+
+### Neopixel
+
+- *[查看产品详情](zh_CN/unit/neopixel)*
+
+- 设备类型：GPIO
+
+- Chip: **SK6812**
+
+```python
+# init --- Effective IO: PORTA | PORTB | PORTC, number --> 0 ~ 1023
+unit_Neopixel = unit.get(unit.NEOPIXEL, unit.PORTB, number)
+# pos: 1 ~ number
+# color: 0x000000 ~ 0xffffff rgb888
+unit_Neopixel.setColor(pos, color)
+# 0 < posBegin < posEnd < number
+# color: 0x000000 ~ 0xffffff rgb888
+unit_Neopixel.setColor(posBegin, posEnd, color)
+# color: 0x000000 ~ 0xffffff rgb888
+unit_Neopixel.setColorAll(color)
+# brightness: 0~255
+unit_Neopixel.setBrightness(brightness)
+```
+
+
+
+### RGB
+
+- *[查看产品详情](zh_CN/unit/rgb)*
+
+- Chip: **SK6812**
+
+```python
+# init --- Effective IO: PORTA | PORTB | PORTC
+unit_Rgb = unit.get(unit.RGB, unit.PORTB)
+# pos: 1 ~ number
+# color: 0x000000 ~ 0xffffff rgb888
+unit_Rgb.setColor(pos, color)
+# 0 < posBegin < posEnd < number
+# color: 0x000000 ~ 0xffffff rgb888
+unit_Rgb.setColor(posBegin, posEnd, color)
+# color: 0x000000 ~ 0xffffff rgb888
+unit_Rgb.setColorAll(color)
+# brightness: 0~255
+unit_Rgb.setBrightness(brightness)
+```
+
+
+### Weight
+
+- *[查看产品详情](zh_CN/unit/Servo)*
+
+- Chip: **HX711**
+
+```python
+# init --- Effective IO: PORTA | PORTB | PORTC
+unit_weight = unit.get(unit.WEIGHT, unit.PORTA)
+# 0 ~ 16777216 (24bit)
+rawData = unit_weight.rawData
+# get weight
+weight = unit_weight.weight
+# set weight to zero
+unit_weight.zero()
+```
+
+### Servo
+
+Analog Device ( *[查看产品详情](zh_CN/unit/Servo)*
+
+```python
+# init --- Effective IO: PORTA | PORTB | PORTC
+unit_servo = unit.get(unit.SERVO, unit.PORTA)
+# us: 500 ~ 2500, 50HZ, High level duration
+unit_servo.write_us(us)
+# degrees: 0 ~ 180,  degree
+unit_servo.write_angle(degrees)
+```
+
+---------------------------------------
+
+## UART
+
+### Finger
+
+- *[查看产品详情](zh_CN/unit/finger)*
+
+- Chip: **FPC1020A**
+
+```python
+# init --- Effective IO: PORTA | PORTC
+unit_finger = unit.get(unit.FINGER, unit.PORTC)
+# Method
+# will change if finger state change
+unit_finger.state
+
+# user_id: 0 ~ 255
+# access: 1, 2, 3
+# note: if call this fun, unit_finger.state -> 'Wait add finger'
+# finish: unit_finger.state -> 'Wait add finger'
+# fail: unit_finger.state -> 'Add user fail'
+unit_finger.addUser(user_id, access)
+
+# if read know finger, will callback fingerCb with 2 formal parameter 
+def fingerCb(user_id, access):
+  if user_id == 1 and access == 2:
+    pass
+unit_finger.readFingerCb(callback=fingerCb)
+
+# user_id: 0~255
+# finish: unit_finger.state -> 'Delete user finish'
+# fail: unit_finger.state -> 'Delete user fail'
+unit_finger.removeUser(user_id)
+
+# remove all user data
+unit_finger.removeAllUser()
+```