CW32 Voltage and Current Meter

       The training camp project, a collaboration between LCSC and Wuhan Xinyuan Semiconductor, utilizes the LCSC CW32F030C8Tx development board. This eliminates the need to design a minimum system, replaces the original DC interface with a Type-C interface, and omits the LDO chip, making it more convenient. The connectors have also been modified for greater robustness and reliability, and components have been replaced with surface-mount packages.
       Voltage measurement is DC 0-30V, and current measurement is 0-3A.
       The hardware section primarily focuses on voltage and current sampling circuits.
       The software implementation includes a continuously flashing LED indicator and a digital tube display of current and voltage. A calibration function is also included: defining five operating modes. The K1 key switches between display modes. The K2 key sets the parameter values ​​for the corresponding mode and saves them to FLASH. The K3 key returns to mode 0.
Mode 0: Displays normal voltage and current values ​​(the upper row of the digital tube displays the voltage value *.V or .*V automatically switching, the lower row displays the current value _.**A).
Mode 1: Sets the 5V voltage calibration value. Mode 1: Voltage 15V Calibration Setting. The top row of the digital tube displays 5.05. The next row displays the current voltage value in _V or ._V. In this mode, the multimeter should be set to 5.00V when measuring the measured bit. After pressing the K2 key, the current value is
calibrated to 5V. Mode 2: Voltage 15V Calibration Setting. The top row of the digital tube displays 5.15. The next row displays the current voltage value in _V or ._V. In this mode, the multimeter should be set to 15.0V when measuring the measured bit. After pressing the K2 key, the current value is calibrated to 15V.
Mode 3: Current 0.5A Calibration Setting. The top row of the digital tube displays A.0.5. The next row displays the current current value in _.**A. After pressing the K2 key, the current value is calibrated to 0.5A.
Mode 4: Current 1.5A Calibration Setting. The top row of the digital tube displays A.1.5. The next row displays the current current value in *.**A. Pressing the K2 key will calibrate the current value to 1.5A.
This is the core part of this training camp: calibration to improve the accuracy and precision of instruments or systems.