#The 7th Lichuang Electric Competition# Based on N32G430USB voltage and current meter

Functions and features
0.91-inch OLED screen, clear and compact display effect;
PCB board adapts to the public version shell;
low-resistance sampling resistor is used to prevent excessive internal resistance from affecting USB power supply efficiency;
maximum voltage measurement support: 6V
maximum measurement current: 2.8A
support power display
hardware design
main control
N32G430C8L7 microcontroller product adopts high-performance 32-bit ARM Cortex™-M4F core, integrated floating-point unit (FPU) and digital signal processing (DSP), and supports parallel computing instructions. The highest working frequency is 128MHz, integrated up to 64KB on-chip encrypted storage Flash, and supports multi-user partition authority management, and supports 16KB embedded SRAM. It has an internal high-speed AHB bus, two low-speed peripheral clock buses APB and bus matrix, supports 40 reusable I/Os, provides a rich set of high-performance analog interfaces, including a 12-bit 4.7Msps ADC, supports 16 external input channels and 3 internal channels, and provides a variety of digital communication interfaces, including 4 U(S)ARTs, 2 I2Cs, 2 SPI/I2Ss, and 1 CAN 2.0B communication interface. The N32G430C8L7 microcontroller product can work stably in the temperature range of -40°C to +105°C, with a supply voltage of 2.4V to 3.6V, and provides a variety of power consumption modes. Not many resources are used in this case, and the internal clock has been open sourced to meet the design requirements, so there is no need for an external clock circuit. It should be noted that each power pin of the chip needs to be connected to an additional 100nF external filter capacitor, and the 1st pin of the chip needs to be connected to an additional 4.7uf filter capacitor.
Reset circuit, BOOT circuit
burning interface
voltage conversion

current sampling, USB input/output
USB input/output
The USB input uses a Type-A male plug, and the input voltage is 5V. This interface supports a maximum output of 3A. If it is larger, it will be a bit hot. It is recommended not to exceed 3A of current. If you need to use a larger current, please replace the Type-A male plug. The
USB output uses a 4P sinker female socket. In order to adapt to the public version of the shell, the maximum rated current of this female socket is 1.5A. It is measured to 2.5A, but it is not suitable for long-term work at this current. If you need to use a larger current, please replace it yourself.