diff --git a/readme.md b/readme.md
index f0d5a39..48cdebd 100644
--- a/readme.md
+++ b/readme.md
@@ -38,10 +38,10 @@ the RP2040 has some UART interfaces ans a USB port, the USB is used for this des
 ### MAX31865
 the on-board MAX31865 chip supports 2/3/4 wires, PT100/PT1000 RTD. please notice that you should choose the reference resistor(430R/4.3K) and a capacitor(100nF/1uF) based on your RTD value. If you use an 3wire RTD, please connect the FORCE2 pin to PORCE+, otherwise connect it to GND. Please make sure that your wiring is correct. Check the [Datasheet](https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf) and [Here](Document/max31865.md) for more information.
 
-### SHT20
+### SHT21
 This sensor is used to monitor chamber temp.
 
-Though SHT20 is an NRND product now, we have no choice because klipper frimware only support SHT20. DS18B20 sensors are only supported on the "host mcu". A NTC thermistor should work too, so if a RTD sensor is used to measure hotend temp, you can have a try.
+Though SHT21 is an NRND product now, we have no choice because klipper frimware only support SHT21. DS18B20 sensors are only supported on the "host mcu". A NTC thermistor should work too, so if a RTD sensor is used to measure hotend temp, you can have a try.
 
 ### ADXL345
 is for resonances measurement. Both ADXL343 and ADXL345 should work
@@ -68,8 +68,10 @@ You may choose
 
 | Buck converter options |
 | --- |
-| BL9342(by Shanghai Belling) |
-| LMR54410(by TI)(Not tested) |
-| LMR14006(by TI)(Not tested) |
+| LMR14006 |
+| LMR14010 |
+| LMR54410(not tested) |
+| MP2451(not tested) |
+| ~~BL9342(不推荐)~~ |
 
-please check the schmatic for details
\ No newline at end of file
+please check the schmatic and chip datasheet for more details
\ No newline at end of file
diff --git a/readme_cn.md b/readme_cn.md
index eb25341..1de91a4 100644
--- a/readme_cn.md
+++ b/readme_cn.md
@@ -35,8 +35,8 @@ RP2040支持UART和USB，考虑到抗干扰选择了USB连接，不支持CANbus
 ### MAX31865
 板载MAX31865传感器，支持2/3/4线，PT100/1000铂电阻。请自行选择参考电阻(430R/4.3K)和电容(100nF/1uF)，根据需要设置跳线并进行短接，请参考[Datasheet](https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf)，详细设置见[此处](Document/max31865_cn.md)
 
-### SHT20
-用于测量箱温，SHT20目前NRND，可是klipper目前仅支持SHT20，DS18B20只能直接连接到上位机，用不了。如果使用了铂电阻测温可以利用空闲的NTC测量箱温
+### SHT21
+用于测量箱温，SHT21目前NRND，可是klipper目前仅支持SHT21，DS18B20只能直接连接到上位机，用不了。如果使用了铂电阻测温可以利用空闲的NTC测量箱温
 
 ### ADXL345
 共振测量，其实只会用到那么一两次，ADXL343和ADXL345都能用
@@ -61,6 +61,8 @@ RP2040支持UART和USB，考虑到抗干扰选择了USB连接，不支持CANbus
 
 | Options |
 | --- |
-| BL9342(便宜) |
+| LMR14006 |
+| LMR14010 |
 | LMR54410(未测试) |
-| LMR14006(未测试) |
+| MP2451(未测试) |
+| ~~BL9342(不推荐)~~ |