STC8H Mini Washing Machine Drive Board

The project originated
from a small washing machine that happened to break down while participating in the event. Embracing the idea of ​​DIY, I attempted to repair it. Considering that the touchscreen was perfectly suited for the 8H4K display,
I compared
the features:

a buzzer sounds upon power-on
, and the buzzer sounds again each time the function is switched via touch.

The three functions

are: 10-minute wash
, 15-minute
wash, and 2-minute spin-dry.

The principle
is easy to understand; it's similar to a button-based indicator light . The
graph shows: TD
A [Power-on Initialization] --> B {Touch pressed? }
B -- Yes --> C [Touch Interruption]
C --> D {Counter +1}
D --> E {Counter value is? } E
-- 0 --> F [Standby]
E -- 1 --> G [1 LED on, 10-minute wash]
E -- 2 --> H [2 LEDs on, 15-minute wash]
E -- 3 --> I [3 LEDs on, 2-minute spin-dry]
E -- Greater than 3 --> J [Counter set to 0]

Notes:

For the circuit, it is recommended to remove the P54 reset circuit (it's not needed).
The STC8H4K has no USB download function and requires cold start serial port download.
For this PCB, there is no power switch (cold start is difficult to achieve using a CH340 serial port downloader). It is recommended to use an STC one-click downloader for one-click download.
If there is a replica, it is recommended to adjust according to the actual model size.
(The PCB was built twice; the first time, the speaker interfered with the installation position and could not be installed (laughs)).