C8T6 UNO

PDF_SL2.1A Taiji USB Expansion Dock (Verified).zip

Altium_SL2.1A Taichi USB Expansion Dock (Verified).zip

PADS_SL2.1A Taiji USB Expansion Dock (Verified).zip

BOM_SL2.1A Taiji USB Expansion Dock (Verified).xlsx

97430

A five-port gigabit switch based on Yutaiwei YT9215S

This is a gigabit, user-friendly switch based on the YT9215S chip. The Ethernet switching chip is the YT9215S from Yutai Microelectronics, and it has 5 Ethernet ports and supports Type-C power delivery.

[Updated 9.12] Fixed incorrect resistor values ​​for the network port.
[Updated 10.26] Updated physical photos
. 0. The schematic diagram and software of this project are for learning and communication purposes only and may not be used for any commercial purposes. Please abide by the relevant open source agreements!
1. I am a beginner, please feel free to give me your guidance.
2. Project Description
This is a gigabit simple switch based on YT9215S. The Ethernet switching chip uses YT9215S from Yutai Microelectronics (theoretically, Pin2Pin is compatible with Realtek RTL8367S, but it cannot boot in practice? Strangely, I couldn't find the problem after checking the datasheet). The interface has 5 Ethernet ports, supports TYPE-C power supply and has reserved DC 12V input
. 3. Tested and working without problems.
4. Configure the resistor
multiplexing pin to read the level when powered on.
5.
The above figure shows the power consumption and temperature of two ports (with heatsinks). The power consumption of three ports is about 1.6W
(it is best to add a heatsink, otherwise the chip will reach 75 degrees Celsius+ without a heatsink).
6. Price
Ethernet chip: 15 RMB on Taobao, network port: a little over 2 RMB each (Taobao knock-off version).

YT9215S_Datasheet_draft_V0.1.pdf

Yutai Microelectronics Product Selection 20230308.pdf

PDF_Five-Port Gigabit Switch Based on YT9215S by Yutai Microelectronics.zip

Altium 5-port gigabit switch based on Yutaiwei YT9215S.zip

PADS_5-Port Gigabit Switch Based on YT9215S from Yutai Microelectronics.zip

BOM_Five-Port Gigabit Switch Based on YT9215S by Yutai Microelectronics.xlsx

97431

Curtain control based on the [LCSC-Liangshanpai Development Board]

The curtains can be controlled by voice and infrared. Using the Liangshanpai development board, along with rain and light sensors to collect weather information, the curtains are controlled by a motor to open and close. The motor is controlled by voice using the HLK-V20 module.

I. Raindrop Detection Principle
The common working principle of raindrop sensors is to determine whether it is raining by detecting the conductivity of water droplets. It utilizes the change in conductivity between two electrodes to measure the presence of water droplets. There is an air gap between these two electrodes, which is normally an open circuit. When a water droplet comes into contact with the electrodes, the conductivity of the water droplet causes current to flow through it, forming a current loop, thereby changing the resistance between the electrodes. By measuring the change in resistance, the presence of water droplets can be determined. ![XVuY7qQLH9rRITbVLPnt6QlfSmZgNOrCZTcEaCff.png]

II. Infrared Remote Control Function
Infrared remote control is used for mode control using the NEC protocol. A complete NEC protocol transmission includes: a preamble, an 8-bit address code, an 8-bit address inverse code, an 8-bit command code, and an 8-bit command inverse code. Here we mainly explain how to receive the NEC protocol content sent by the infrared transmitter.
Preamble: Consists of a 9ms low level followed by a 4.5ms high level.
The 4-byte data consists of: address code + address inverse code + command code + command inverse code. The inverse code is used to verify whether the data transmission was correct and whether there was any packet loss.
Important: When transmitting data bits using the NEC protocol, the distinction between 0 and 1 is based on the duration of the received high and low levels. This is crucial for decoding.
Data transmission 0: 0.56ms low level + 0.56ms high level.
Data transmission 1: 0.56ms low level + 1.68ms high level.
Therefore, the complete time representation of receiving a data bit is as follows:
Data bit 0: 0.56ms low level + 0.56ms high level;
Data bit 1: 0.56ms low level + 1.68ms high level.
Important: When transmitting data bits using the NEC protocol, the distinction between 0 and 1 is based on the duration of the received high and low levels. This is crucial for decoding.
Data transmission code 0: 0.56ms low level + 0.56ms high level;
Data transmission code 1: 0.56ms low level + 1.68ms high level;
Therefore, the complete time representation of receiving a data bit is as follows:
Data bit 0 received: 0.56ms low level + 0.56ms high level;
Data bit 1 received: 0.56ms low level + 1.68ms high level;
There is also a repeat code, which consists of a 9ms low level and a 2.5ms high level. When an infrared signal is continuously transmitted, it can be transmitted quickly by sending repeat codes.
The tick here should be changed to a 1µs timer!
![Screenshot 2023-10-16 214212.png]
III. The
HLK-V20 voice control module is a high-performance, purely offline voice recognition module launched by Hailink Electronics for numerous purely offline control scenarios and products. It can be widely and quickly applied to smart homes, various smart small appliances, 86-type set-top boxes, toys, lighting fixtures, industrial applications, medical devices, IoT devices, automobiles, security and lighting, and other products requiring voice control. The HLK-V20 supports offline recognition of 150 local commands, and allows for free customization of wake-up words, command words, and response broadcast words. It also has rich peripheral interfaces. Offline voice recognition refers to the ability to recognize only fixed command words and does not require a network connection.
This case study comes from the HLK-V20 voice recognition module in section 4.13 of the module porting manual. Following the configuration process of the reference case, the voice module pin settings in this case also select B2P3 as the serial port!![Screenshot 2023-10-16 214154.png] IV. Program Description
1. ADC Acquisition
The raindrop sensor and photosensitive sensor here use an ADC to acquire changes in sensor voltage to determine the sensor status.
![1698285787255.png] The configuration of any peripheral should first configure the clock, then the working mode, etc. The clock of GD32F470 can be configured to 200M, and the maximum clock of ADC is 40M. Care needs to be taken when dividing the frequency.
![1698286129129.png] 2. Serial Port The serial
port configuration is for two reasons: to interact with the voice module and to facilitate debugging. This serial port uses DMA mode. Of course, interrupts can also be used without them. When using interrupts, care should be taken not to print data in the timer in the motor driver, as two interrupts will have an impact, causing the motor to run slowly and not stop.
![1698286302793.png] 3.
Infrared transmission time is very short, so the tick is configured to 1µs, and the high and low level times of the infrared signal are obtained to determine whether the infrared transmission is normal.
![1698286804891.png] 4. Motor drive:
The rotation of the motor is controlled by the high and low levels at different positions. Here, an array and a for loop are used to control the number of loops to make the motor rotate. A timer is used here to make the motor rotate at a regular high speed.
![1698287126209.png] V. Physical demonstration
![a2a6fd735995d03f14fa00e4cbdf847.jpg] Video: ![Uploading_daf7b76e-78d4-46da-b28c-be83f741b5a7]()

video.mp4

GD32F470 template.zip

PDF_Based on [LCSC-Liangshanpai Development Board] Curtain Control.zip

Altium-based curtain control software (based on the LCSC-Liangshanpai development board).zip

PADS_Curtain Control Based on [LCSC-Liangshanpai Development Board].zip

BOM_Based on [LCSC-Liangshanpai Development Board] Curtain Control.xlsx

97432

STC8H8K64U core board

Verification of STC8H8K64U Function Board

This document describes
the design of a minimum system board for the STC8H8K64U. Each I/O pin has an LED for easier pin status monitoring. It utilizes dual Type-C ports for serial or USB download functionality.
 
Features of the chip
include: ● Wide operating voltage range: 1.9~5.5V
● 60 I/O pins
● Common functions such as IIC, SPI, and UART
● Even the most expensive model (LQFP64) costs only 2.5 RMB.
The following is the internal block diagram
 
and schematic of the STC8H8K. The design is
 
based on the STC8H datasheet, with all pins brought out for easy external function verification.
 
 
 
A physical demonstration is also provided.
 

STC8H-20231018.pdf

Demo video.mp4

PDF_STC8H8K64U core board.zip

Altium_STC8H8K64U core board.zip

PADS_STC8H8K64U core board.zip

BOM_STC8H8K64U Core Board.xlsx

97434

NFC Card 2

This is a color-screened NFC card.

This is a beautiful NFC card design.