Low cost voltage and ammeter with dual electronic potentiometer (personally modified version)

The project is not my own original work. If there is any infringement, please contact me and delete it.
This project is modified based on Mr. Taoyuanke 886's low-cost voltage and ammeter with dual-channel electronic potentiometer - Jialichuang EDA open source hardware platform (oshwhub.com). Since the original screen model is FM1721625, it is difficult to buy on the market. Therefore, the screen package was modified to be a 12864-758 of a certain Bosmeiwe, and some of the wiring was optimized.
The silk screen is temporarily broken. You can find welding auxiliary tools in the professional version of EDA for component positioning.
 
PS:
According to the original author, TP09 should be replaceable with other rail-to-rail op amps.
 
Possible problems:
1. Maybe it’s because I rarely use STC, and I don’t understand why this watch requires a minimal system to write the firmware program. If all components are welded, they can only be recognized, but the program cannot be downloaded.
2. The current on my hand can be adjusted, but the display is abnormal and cannot accurately display the current. If the output current has reached 2A, only 0.4-0.5A will be displayed.
3. The accuracy has a certain relationship with the op amp used. If the op amp is defective, it may be difficult to calibrate it.