#Training Camp# CW32 Voltage and Current Meter

The main function used is the ADC (Analog-to-Digital Converter), also known as an A/D converter or simply ADC, which is an electronic component that converts analog signals into digital signals. A typical ADC converts an input voltage signal into an output digital signal. Since digital signals themselves do not have practical meaning, only representing a relative magnitude, any ADC needs a reference analog quantity as a conversion standard. A common reference standard is the largest convertible signal size. The output digital quantity represents the magnitude of the input signal relative to the reference signal. The CW32F030 integrates a 12-bit precision, 1M SPS (Maximum SPS) successive approximation ADC (SAR ADC), capable of converting up to 16 analog signals into digital signals. Most signals in the real world are analog, such as light, electricity, sound, and image signals, all of which must be converted into digital signals by an ADC before being digitized by the MCU.
In terms of software design, the ADC module of the CW32F030 microcontroller is the core for implementing voltage and current measurement. The ADC module has multiple conversion modes, supporting single conversion, multiple conversions, and continuous conversion, and also features sequential scan conversion and discontinuous sequence conversion. The basic parameters of the ADC include resolution, sampling rate, and sampling range. In software design, the ADC channels need to be configured, and corresponding initialization code is written to complete voltage and current sampling and display the results on the digital tube. For voltage and current measurement accuracy, a mean filtering algorithm can be used to reduce data fluctuations and improve the stability of measurement results. The advanced tutorial for the CW32 digital voltmeter and ammeter software introduces how to perform mean filtering on the real-time displayed voltage and current values ​​to eliminate fluctuations in the original data. Furthermore, to improve measurement accuracy, the voltmeter and ammeter can be calibrated. Calibration is the operation of compensating for instrument system errors by measuring the deviation of a standard. Experiment Nine introduces the implementation method of a digital voltmeter and ammeter with calibration function, including the concept of calibration, explanation of important code, and calibration operation methods.