CW32-based voltage and current meters

The CW32 is a microcontroller based on the ARM Cortex-M0 core, featuring rich peripheral interfaces and high performance, making it ideal for developing measuring devices such as voltage and current meters.

System Overview:

This project aims to design a voltage and current meter based on the CW32 microcontroller, capable of accurately measuring and displaying voltage and current values. The device will feature high precision and low power consumption.

Hardware Design:

- Microcontroller Unit: The CW32 is used as the main control chip, responsible for data acquisition, processing, and display.
- Voltage Measurement Unit: The voltage to be measured is reduced to the acceptable range of the microcontroller's ADC module using a voltage divider circuit, and then sampled by the ADC.
- Current Measurement Unit: The current signal is converted into a voltage signal using a current transformer or shunt resistor, and then sampled by the ADC module.
- Display Unit: The measured voltage and current values ​​are displayed in real time using two 3-digit LED displays.
- Power Management Unit: A stable power supply circuit is designed to provide stable power to the CW32 microcontroller and other peripheral circuits.

Software Design:

- Initialization Program: Includes system clock configuration and peripheral initialization (ADC, GPIO, LCD, etc.).
- Data Acquisition Program: Write the ADC sampling program to periodically read voltage and current signals and perform necessary digital filtering.
- Data Processing Program: Convert the ADC sampled values ​​into actual voltage and current values, including unit conversion and calibration.
- Display Control Program: Format the processed data and output it to the display unit for dynamic display.
- User Interaction Program: Design buttons to allow users to perform operations such as range selection and interface switching.

- Calibration and Testing:

- Calibration Program: Write a calibration program to calibrate the device using standard voltage and current sources to ensure measurement accuracy.
- Testing Program: Conduct comprehensive functional and accuracy tests to ensure the device can measure accurately under various conditions.

- Safety and Reliability:

Ensure the design complies with relevant safety standards and electromagnetic compatibility requirements; conduct necessary safety tests and reliability assessments.