USB interface powered Bluetooth color light strip controller

Jane Medium ： For the purchased one USB Power supply 、 The light band controlled by Bluetooth is preliminarily tested . unfortunately , I was originally interested in it, including the control chip with Bluetooth interface , But because the chip information on the circuit board is missing, I can't know . This light band control scheme is a relatively simple one ： be-all RGB LED They are all connected in parallel , Only the overall light color control , Cannot form the effect of running water lamp .

key word ： Lamp with ,USB, bluetooth

 

§01 ask Question proposal

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1.1 problem

   Zhuo Da , Ask you a question ： This is the one I bought recently rgb controller , But I don't know what type of chip it is .

【 TaoBao 】https://m.tb.cn/h.fP2Kziq?sm=a85426?tk=ctX122iI37d「USB Bluetooth voice control colorful RGB Light Bar TV background computer desk display led Smart atmosphere 5V Lamp with 」

   The Bluetooth controller inside is very simple , It's a single-layer board , But the chip screen printing is not clear . Can you make a tweet to see if you have time ？

▲ chart 1 Color light with internal controller

1.2 reply

  1. well .
  2. I also follow the Taobao link you provided , Buy two .
  3. Actually, I was https://mp.weixin.qq.com/s?__biz=MzA5NjQyNjc2NQ==&mid=2452244746&idx=1&sn=4cc22038f91847f7ce0ec0c44ef53c1b&chksm=876ea768b0192e7e128bf6d096cd1fdda5f4be8280d40c2f449001418faedb50009a3b54b59f&token=952383159&lang=zh_CN#rd Introduced a control scheme .

 

§02 blue Dental controller

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   the Have a spring festival , today （2022-02-15） Just received the order before the festival USB Bluetooth color light band . On the one hand, it is to check the controller circuit design , On the other hand, whether it can be used in future engineering design .

2.1 Color light with basic information

   The color light strip delivered includes a length of about 1 Meter soft light strip , The distance between the lamp beads is about ：3.5 centimeter . In addition, it is equipped with a controller , The controller passes USB Interface to get +5V Working power supply .

▲ chart 2.1.1 Colored lights with

2.1.1 Internal structure of lamp strip

   The inside of the light strip contains 3.5 It is composed of independent segmented light-emitting structures of about cm .

• Trichromatic glow LED： Model unknown , Number of luminous colors ：RGB;
• Current limiting resistor ：
  • Red ：331;
  • green ：151;
  • Blue ：151;

▲ chart 2.1.2 Internal structure of lamp strip

   Look through the interface , This light band should be all three colors LED All in parallel ; Three colors LED There are three lines for control lighting . So it belongs to the simpler way . Waiting cannot form something like WS2812 Serial controllable color LED Lamp beads Display mode of water light strip .

▲ chart 2.1.3 Controller housing information

2.1.2 Power on test

   Connect USB After the power supply , The light band changes and starts to automatically change colors ： red → green → blue Transformation . The switching time is about 500ms.

▲ chart 2.1.4 After power on, the light strip changes color

2.2 Light strip controller

   An interesting light strip controller includes SOP-16 Packaged integrated chip , Guess is something MCU. It has Bluetooth interface , In the circuit, the antenna on the circuit board and IC Of PIN19 Connected to a .

▲ chart 2.2.1 The control panel inside the light strip

2.2.1 Master chip

   I was hoping to get this IC model , Unfortunately, there is no model information on it .

▲ chart 2.2.2 There is no model information on the master chip

2.2.2 Control interface

   The wait control interface consists of three NPN SOT-23 Packaged triode , Drive the parallel RGB LED.
   If you need to adjust the light intensity , It should be through PWM To control .

 

※ branch Analysis and summary ※

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   Yes One bought at Yu Gou USB Power supply 、 The light band controlled by Bluetooth is preliminarily tested . unfortunately , I was originally interested in it, including the control chip with Bluetooth interface , But because the chip information on the circuit board is missing, I can't know . This light band control scheme is a relatively simple one ： be-all RGB LED They are all connected in parallel , Only the overall light color control , Cannot form the effect of running water lamp .

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■ Links to related literature :

• USB Bluetooth color light band
• WS2812 Serial controllable color LED Lamp beads

● Related chart Links :

• chart 1 Color light with internal controller
• chart 2.1.1 Colored lights with
• chart 2.1.2 Internal structure of lamp strip
• chart 2.1.3 Controller housing information
• chart 2.1.4 After power on, the light strip changes color
• chart 2.2.1 The control panel inside the light strip
• chart 2.2.2 There is no model information on the master chip