A calibrable voltmeter and ammeter (7347744A).

1. Project Function Introduction:

This project is for the CW32 voltmeter and ammeter training camp.
It allows for manual calibration and measurement value setting,
making it a project with practical application value.
More learning materials for this project: https://wiki.lckfb.com/zh-hans/dwx-cw32f030c8t6/training/voltammeter-bootcamp/voltammeter.html
 
2. Project Attributes:

This project is for participation in the "CW32 Voltage and Current Training Camp".
 
3. Hardware:

Switches allow you to set the current state to analog voltage or actual voltage measurement.
A precision multi-turn potentiometer adjusts the analog output voltage.
In actual testing, switches can be used to set the voltage measurement range,
and switches can be used to set whether the current measurement is actual or analog.
A precision multi-turn potentiometer adjusts the analog output current.
 
Learning videos: https://www.bilibili.com/video/BV1mw4m1r7Er/?spm_id_from=333.788&vd_source=66ea5d947e141827003216742d914809
 
4. Software: A

pre-compiled hex file is attached at the bottom. It can be directly burned.
If you wish to learn the code, the Keil software source code is attached (project.zip).
Five working modes are defined. 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, the lower row displays the current value _.**A).
Mode 1: 5V voltage calibration 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 to measure the measured bit. Pressing the K2 key calibrates the current value to 5V.
Mode 2: 15V voltage calibration 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 measured bit. After pressing the K2 key, the current value is calibrated to a 15V voltage value.
Mode 3: Current 0.5A calibration value setting. The upper row of the digital tube displays A.0.5. The lower row displays the current current value _.**A. After pressing the K2 key, the current value is calibrated to a 0.5A current value.
Mode 4: Current 1.5A calibration value setting. The upper row of the digital tube displays A.1.5. The lower row displays the current current value *.**A. After pressing the K2 key, the current value is calibrated to a 1.5A current value.
Learning video: https://www.bilibili.com/video/BV1Fw4m1C7db/?spm_id_from=333.788&vd_source=66ea5d947e141827003216742d914809