Voltmeter and Ammeter Training Camp

This digital voltmeter and ammeter with calibration function was created based on the LCSC CW32F030C8T6 development board.
Calibration is performed using button operation. The specific operation method is as follows:
Define 5 working modes. The K1 key is used to switch display modes. The K2 key sets the parameter value for the corresponding mode and saves it 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: 5V voltage calibration value setting. The upper row of the digital tube displays 5.05. The lower row displays the current voltage value _.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 as a 5V voltage value.
Mode 2: 15V voltage calibration value setting. The upper row of the digital tube displays 5.15. The lower row displays the current voltage value _.V or ._V. In this mode, the multimeter should be set to 15.0V to measure the voltage of the measured part. After pressing the K2 key, the current value is calibrated to 15V.
Mode 3: Current 0.5A calibration setting. The upper row of the digital display shows A.0.5. The lower row displays the current current value _.**A. After pressing the K2 key, the current value is calibrated to 0.5A.
Mode 4: Current 1.5A calibration setting. The upper row of the digital display shows A.1.5. The lower row displays the current current value *.**A. After pressing the K2 key, the current value is calibrated to 1.5A.