Voltmeter and Ammeter

Main Functions
: Voltage Measurement and Display: Capable of measuring voltage values ​​within a certain range and displaying them in real-time via a digital tube. The measurement range can be adjusted according to specific designs, such as 5-30V.
Current Measurement and Display: Capable of measuring current values ​​within a certain range and displaying them in real-time via a digital tube. The measurement range can also be adjusted according to specific designs, such as 0.1-3A.
Design Considerations :
1. Main Control Chip Selection: A CW32 series microcontroller is used as the main control chip, utilizing its powerful data processing capabilities and rich peripheral interfaces to achieve voltage and current measurement and control.
2. Voltage Acquisition Circuit: The voltage to be measured is reduced to an acceptable range for the ADC through a voltage divider circuit for sampling. The selection of the voltage divider resistor needs to consider factors such as the maximum value of the measured voltage, the ADC reference voltage, and power consumption.
3. Current Acquisition Circuit: A low-side current sampling circuit is used for current detection. The selection of the sampling resistor needs to consider factors such as the maximum value of the measured current, the voltage difference caused by the current sensing resistor, and power consumption.