Touch desk lamp design based on RH6616 and EG2808

• Introduction: This project is the final assignment of the basic class of the training camp. Two control ICs, RH6616 and EG2808, are used to realize two different control methods for 24 LEDs. PS: I originally made a hub, and then I found out that the main controller I used The controller was out of stock, and I happened to be missing a lamp, so I came up with this thing.

• Function introduction: 18650 battery powered, built-in charging module with a low battery indicator light and two independent control modes

  1. Segmented control (switch when power off)——100% light, 50% light, 25% light, slow flash (2HZ), fast flash (6.8HZ)
  2. Stepless dimming (touch control)——With brightness memory, the brightness gradually changes each time it is switched on or off

• Component selection ideas: This project is a simple LED small lamp, 18650 plug-in battery box, easy to move, and can be supported by the thickness of the battery box (because there are many idle 18650 batteries on hand) typec interface, easy to use (depends on the size) Stream 2333) The eight-pin three-stop SMD switch is designed to take into account both switching and mode switching at the same time, and to reduce the number of components on the board. 5730 SMD LEDs. When purchasing components, I purchased SMD LEDs in three colors. You can manually adjust RGB, and the EG2808's brightness adjustment function can quickly adjust the desired color.

• PCB design ideas Because the number of components is small and the board space is sufficient, the first thing I consider is the aesthetics of the placement of the original components (I’m an old obsessive-compulsive disorder). Considering the placement during use, I designed the charging port and switch in two places On the narrow side, a side-dial chip switch was selected to minimize the protrusions on the board. At the beginning of the design, the peripheral circuits of each IC were determined, and then the overall placement of the original components was planned. Determined the front: charging management, low battery alarm, back: battery box*2, RH6616, EG2808 and other resistor-capacitor originals. It should be noted that when designing the touch pin of RH6616, the touch pin must be set according to the specifications given in the data sheet. The lead is in the middle because I plan to lead the touch wires to both ends of the battery box. If you have your own ideas, please match the actual situation to determine the position of the original parts and the pad settings of the lead points. EG2808 provides many configuration modes, and I have also prepared regret medicine. Different modes for later selection, detailed mode silkscreen on the back

• Original parts welding

I marked the resistance and capacitance values ​​of almost all the original parts on the silk screen. With the schematic diagram, this is almost a nanny-level tutorial 23333

Finally, a blinding light was requested in the comment area.

• マジやばくね~~