The adapter uses an LMR14030 to provide a wide 4-40V input voltage, initially stepping down to 5V; then a TP4510 steps down to 4.2V, providing battery protection.
The lower half of the adapter houses a large battery, providing ample space on the power board, even allowing room for a small battery
This does not affect the adapter's battery indicator lights (the original battery is a high-voltage lithium battery; the power board uses a TP5410 with a charging cutoff voltage of 4.25V, so even when fully charged, only two indicator lights will illuminate)
. [Image 3]
. [Image 4]
Overall connection effect; using a 12V input, the battery current is 1A.
. [Image 3] [Image 4]
PDF_XREAL AR glasses adapter modified power board for simultaneous use and charging.zip
Altium_XREAL AR glasses adapter with modified power board for simultaneous use and charging.zip
PADS_XREAL AR glasses adapter with modified power board for simultaneous use and charging.zip
BOM_XREAL AR glasses adapter modified power board for simultaneous use and charging.xlsx
This program implements the ESP32S3 to drive the screens of ST7789/ST7735/ILI9341, controlling these LCD screens via LVGL to display images, text, and other information.
Connecting the screen using DuPont wires is too cumbersome, so I drew a simple driver board.
**ST7789 physical driver effect**
![0aa.png]
**ST7735 physical driver effect**
![1aa.png]
**ILI9341 physical driver effect**
![2aa.png]
ili9341.mp4
st7789v3.mp4
st7735.mp4
project_Lvgla-drivers.zip
project_Lvgla - copy.zip
main.c
PDF_ESP32S3 driver ST7789-ST7735-ILI9341 screen.zip
Altium_ESP32S3 driver for ST7789_ST7735_ILI9341 screen.zip
PADS_ESP32S3 driver for ST7789_ST7735_ILI9341 screen.zip
BOM_ESP32S3 driver for ST7789_ST7735_ILI9341 screen.xlsx
94439
Resistance comparison test
Compare the resistance values
The LM393 dual voltage comparator is used to detect the resistance value under test. When the voltage at the non-inverting input (IN+) is higher than the voltage at the inverting input (IN-), the output (OUT) will be high; conversely, when the voltage at the non-inverting input is lower than the voltage at the inverting input, the output will be low. The current circuit's non-inverting input (IN+) is input via a voltage divider from the sampling resistor and compared with the resistance value under test (IN-). When the resistance value under test is less than the sampling resistance value, a Darlington relay is driven to output a value.
This can be used for quickly screening products with resistance values within a suitable range.
PDF_Resistor Size Comparison Test.zip
Altium_resistance size comparison test.zip
PADS_Resistor Comparison Test.zip
BOM_Resistor Size Comparison Test.xlsx
94440
potentiometer lamp ring
LED potentiometer ring based on STC8G microcontroller
[Bilibili] https://b23.tv/aceiFyY
The LED driver is TM1637, and the main controller is STC8G1K08A.
**Important!** The LED package is reversed!
upper_video_1712738824945784.MP4
code.7z
PDF_PotentitlerLampRing.zip
Altium_potentiometer lamp ring.zip
PADS_PotentialistorLampRing.zip
BOM_PolypotentiometerLampRing.xlsx
94441
Solar MPPT power panel
This is a solar power module based on the SN3722.
The CN3722 (Note 1) is a PWM buck charging management IC that can be powered by a solar cell and features solar cell maximum power point tracking. The CN3722 is ideal for charging single or multi-cell lithium-ion or lithium iron phosphate batteries, offering advantages such as small package size, fewer external components, and ease of use. The CN3722 features constant current and constant voltage charging modes, making it ideal for charging lithium-ion or lithium iron phosphate batteries. In constant voltage charging mode, the constant voltage is set by an external resistor divider network; in constant current charging mode, the charging current is set by an external resistor. For deeply discharged batteries, when the battery voltage is below 66.7% of the set constant voltage, the CN3722 trickles the battery with 15% of the set constant current. During constant voltage charging, the charging current gradually decreases, and charging ends when the charging current decreases to 9.5% of the set constant current. When the input power supply fails or the input voltage is lower than the battery voltage, the CN3722 automatically enters a low-power sleep mode. Other features include input low voltage latch-up, battery temperature monitoring, battery overvoltage protection, and charging status indication. The CN3722 is packaged in a 16-pin TSSOP package.
7bc47922ec3f5fed5eeb22962d842ca.jpg
db7d70001bdbdc71edcf0f065d0f7b9.jpg
PDF_Solar MPPT Power Board.zip
Altium_Solar MPPT Power Board.zip
PADS_Solar MPPT Power Board.zip
BOM_Solar MPPT Power Board.xlsx
94442
electronic
This does not affect the adapter's battery indicator lights (the original battery is a high-voltage lithium battery; the power board uses a TP5410 with a charging cutoff voltage of 4.25V, so even when fully charged, only two indicator lights will illuminate) 
The side panel has an opening, using an XT30 as the power input interface 
Overall connection effect; using a 12V input, the battery current is 1A. 
The glasses display is normal, with no flickering 
京公网安备 11010802033920号
AM79489-5JC
