Month: October 2023

Rotate button by Arduino

Refer to , buy from here

2023/10/30 0

MCP4725 I2C DAC Breakout board

Bought from here Testing maximum frequency, around 800us

2023/10/30 0

GY-4725 board

Bought from here. This code test maximum frequency, around 1ms period is peak Documents

2023/10/30 0


Main point: calculate Ib, we can do it by Ib=Ic / Beta min OR Ib=(Vb – 0.7) / Rb

2023/10/27 0

Redis uses its own protocol to communicate between redis-server and redis-client

I thought db client sending plain text command (in SQL) to server and server parse the command. But I found Redis and Mysql client communicate to server via a custom protocol, that prove the client parse the command, not the server socat -v tcp-listen:8001,reuseaddr,fork tcp:localhost:6379

2023/10/15 0

FPGA Research

This is a synthesis of a simple verilog program in vivado

2023/10/14 0


“紅色程序員”又或者”大中華程序員”之定義: “大香港程序員”之定義

2023/10/09 0

Funny Toy : Oscilloscope

I got this electronic toy from Taobao, i want to have more experience on soldering and putting different components on the PCB and making them work. After 3 hours in soldering and 1 hour in debugging, i finally make it works All documents here

2023/10/09 0

砌機 : FPGA

Lattice FPGA比STM32簡單, 我應該可以搞得掂 用户手册: 串口驱动:原理图及源码: 主要component其實得兩個: FGPA同粒Flash

2023/10/05 0


已經同大部份嘅公營機構做過生意, 公營機構嘅IT部技術同hands-on氣氛同以下元素嘅關係 同以下元素有關係, 我解釋唔到點解, 但觀察得之係有一定關係

2023/10/04 0


香港有好多阿叔,業界學界商界全部都係由阿叔為主,同佢地只要係有少少聯絡,你都要好小心,以下是指引 香港唔存在”前輩”呢一層,我唔係話香港無人夠資格稱做前輩,而係真正稱得上係前輩嘅人太少,唔足以叫做一代人。所以要摒棄幻想,唔好諗住搞到啲阿叔去指導你,唔點你都算係咁。香港啲中小學生同年青人未知呢個事實,所以寫呢篇文。

2023/10/01 0