a tiger working in the office.
Xiaomi's temperature and humidity control system was modified to use lithium batteries for power supply.
The Xiaomi 2nd generation thermometer and hygrometer utilizes the TP4056 charging chip and soft-pack lithium battery to achieve a rechargeable solution, supporting USB direct plug-in and battery power switching.
Reference price of core material
model: RT9013-33GB 0.5 TPS3809K33DBVR (for low battery warning, soldering not required) 1 402030 soft-pack lithium battery 5 TP4056 0.5 Mainly for learning Solidworks modeling. To be honest, the materials are not cheap. Nanfu 2030 only costs 2 yuan per unit and can be used for more than a year.
Thermometer back cover.STL
PDF_Xiaomi Temperature and Humidity Modified Lithium Battery Power Supply.zip
Altium_Xiaomi Temperature and Humidity Modified Lithium Battery Powered.zip
PADS_Xiaomi Temperature and Humidity Modified Lithium Battery Powered.zip
BOM_Xiaomi Temperature and Humidity Control Modified Lithium Battery Power Supply.xlsx
95422
Orange Pie LCD Screen Expansion Board
Compatible with the Orange Pie 5 Plus's 1.47-inch 172*320 TFT display, using ST7789V3 driver.
The LCD driver circuit and program are from https://github.com/Temperature6/DevMonitor_for_Pis.
Recommended board thickness: 1.2.
PDF_Orange Pie LCD Screen Expansion Board.zip
Altium Orange Pie LCD Screen Expansion Board.zip
PADS_OrangePie LCD Screen Expansion Board.zip
BOM_OrangePie LCD Screen Expansion Board.xlsx
95423
HDMI to AV signal - MS1836 - for analog video transmission connection development boards
Converts HDMI signals to AV analog signals. The output analog video signal format (PAL/NTSC) is controlled by a switch. Suitable for connecting development boards to airborne video transmission systems for model aircraft. It can convert the HDMI video output of devices such as Orange Pi to analog video output, which can then be connected to an analog video transmission system.
The physical demonstration
compares the size with a USB flash drive.
Connect the HDMI output of a Windows 11 computer to this module, and then connect the AV output of this module to the image transmitter. All devices share a common ground, and finally, connect the module to power. The image below shows the screen of the image transmitter receiver.
Copyright information
modified from the original project: https://oshwhub.com/aknice/ms1836
Original project author: https://oshwhub.com/aknice Original
project open source license: GPL 3.0 This
project author: https://oshwhub.com/newcomer00
This project open source license: GPL 3.0
Product function
Original project function: Converts HDMI signals to AV analog signals. Controls the output analog video signal format (PAL/NTSC) via a switch.
Modified in this project:
Only outputs video signals, no longer outputs audio signals;
reduces PCB size;
suitable for development boards connecting to model aircraft airborne image transmitters. Can convert the HDMI video output of devices such as Orange Pi to analog video output, and then connect it to an analog image transmitter.
Input/Output
Power Supply Input: 5V
Signal Input: HDMI
Signal Output: AV
PCB Size
Considering only PCB size, excluding HDMI and switch dimensions:
38.665mm x 24.967mm
Operating Parameters
Typical operating current with 5V power supply and no HDMI input connected: ~215mA
Typical operating current with 5V power supply and HDMI input connected: ~315mA
PDF_HDMI to AV Signal - MS1836 - Suitable for Analog Video Transmission Connection Development Boards.zip
Altium_HDMI to AV signal-MS1836-for analog video transmission connection development board.zip
PADS_HDMI to AV signal - MS1836 - for analog video transmission connection development boards. zip
BOM_HDMI to AV signal - MS1836 - Suitable for analog video transmission connection development boards.xlsx
95425
USB to TTL converter based on CH343P
Mini USB to TTL adapter based on CH343, integrating Type-C and USB-A interfaces.
This design uses single-sided surface-mount
0402 capacitors and resistors,
with all traces running at a 45-degree arc. All
CH343 pins are exposed.
This double-sided design is strictly prohibited from commercial use without the author's written authorization; otherwise, legal action will be taken. PS: Please refrain from criticism regarding hand-soldered components. Suggestions are welcome. Please use PCB version 1_1, which has been verified.
WeChat image_20240402004142.jpg
WeChat image_20240402004140.jpg
WeChat image_20240402004136.jpg
WeChat image_20240402004132.jpg
WeChat image_20240402004128.jpg
PDF to USB to TTL conversion based on ch343p.zip
Altium USB to TTL converter based on ch343p.zip
PADS_USB to TTL converter based on ch343p.zip
BOM_usb to TTL conversion based on ch343p.xlsx
95427
Xiaohua HC32F460JETA Minimum System Board
Xiaohua HC32F460JETA Minimum System Board
**Xiaohua HC32F460JETA Minimum System Board**
This is the minimum system board. For expansion boards, see the link: [https://oshwhub.com/blucevenn/hc32f460_exp_board](https://oshwhub.com/blucevenn/hc32f460_exp_board).
Xiaohua is a brand under Huada Semiconductor. I've recently used this domestically produced chip for some projects and found it to be quite good. I've built a minimal system board suitable for solution verification.
Xiaohua Semiconductor's official website - HC32F460JETA chip introduction: [https://www.xhsc.com.cn/Productlist/info.aspx?itemid=1852](https://www.xhsc.com.cn/Productlist/info.aspx?itemid=1852).
Based on the official examples, I've compiled related example code, which can be found in the code repository:
[https://gitee.com/tang176084/HC32F460learn](https://gitee.com/tang176084/HC32F460learn).
PDF_Xiaohua HC32F460JETA Minimum System Board.zip
Altium_Xiaohua HC32F460JETA Minimum System Board.zip
PADS_Xiaohua HC32F460JETA Minimum System Board.zip
BOM_Xiaohua HC32F460JETA Minimum System Board.xlsx
95428
electronic
featuring a meeting between a fox and a tiger, and 
a tiger working in the office.
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