First, regarding the power supply, the adapter for the aquarium light I bought previously was a 21V output, so a step-down circuit was needed. I made a simple step-down circuit using a TL431 and SS8050, which should work with most common 5-25V adapters used in homes. 
Secondly, as a PWM dimming board, the PWM control circuit is essential 
. I added two potentiometers, a tactile switch, and two LEDs for control and interaction. Each pin of the chip is also connected to a header for connecting external modules, such as the OLED module shown in the initial screenshot. 
All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.
It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.
Supported by EEWorld Datasheet
EEWorld
subscription
account
EEWorld
service
account
Automotive
development
community
Robot
development
community
About Us Customer Service Contact Information Datasheet Sitemap LatestNews
Room 1530, 15th Floor, Building B,
No.18 Zhongguancun Street,
Haidian District,
Beijing, Postal Code: 100190
China
Telephone: 008610 8235 0740
京公网安备 11010802033920号
CWR09HB105MPA
