Electronic Sticky Notes_Memo_8223867A (V1.0 verified by prototyping)

Figure V1.0 has the following problems:
9.10
The power supply schematic IP5306 GND is not connected, the SY8089 enable pin is not supplied with voltage, and the detection resistor is not properly connected; 9.10 After the jumper wire is connected, there is a 3.3V power output;
 
The LED on pin 33 is not lit (it is triggered by a low level, and is lit by default; it can be used as a power indicator).
Inspection suspected a cold solder joint on the CH340X. After multiple reworks and overcoming the difficulty of solder bridging, it was decided to resolutely avoid using microchips in the future (the pins are too dense, making manual work extremely difficult). On
 
September 11th
, the CH340 was still not recognized upon power-up. Upon inspection, no 3.3V power was found. The power supply buzzer was frequently triggered
, leading to suspicion of a buzzer malfunction. The buzzer was removed, and the voltage was checked again, finding it fluctuating between 1.8V and 1.6V;
 
a short circuit was suspected, triggering the SY8089A1AAC protection (this was ruled out).
 
After a period of rest (approximately 3 hours), the SY8089A1AAC again output 3.3V. At
15:32,
with an external independent 3.3V power supply, the computer could recognize the CH340, proving it was working normally (it wasn't damaged by heat; I initially thought it was). At
 
15:35
, the voltage dropped further, fluctuating between 1.64V and 1.58V. Shorting
R23 to ground caused the LED to light up. Could the low voltage be due to an incorrect resistance ratio of the detection resistor?
September 15, 15:35:
Finally, a stable 3.3GHz connection was achieved (the cause was a faulty ground solder joint on the SY8089A1AAC; I thought that as long as the other pins were soldered correctly, leaving one unsoldered wouldn't matter). The computer could also recognize the CH340, and the software could be flashed.
September 16, 20:34:
Multiple download failures were discovered. Upon inspection, an RX and TX connection error was found. After correcting the error with jumper wires, a blue screen appeared on every download attempt.
Apparently, this was because the CH340's storage space was relatively small, causing it to frequently request storage from the CPU. It seems a chip replacement is needed.
V1.1 rewiring improved the above issues. Software debugging will begin once the CH343P chip arrives.
 

Project Description:
 
A server-side push notification feature with a buzzer for timed reminders, such as holiday reminders or work-related reminders. It includes a TF card slot, allowing it to be used as a mini NAS for LAN file transfer and temporary storage.