#The7thLiChuangElectricityContest#USB voltage and current meter

 
* 1. Project function introduction
This is a training camp project, fast charging version, supports measuring voltage from 6V to 24V
 
*2. Project attributes
0.91-inch OLED screen, clear and compact display effect;
low-resistance sampling resistor is used to prevent excessive internal resistance from affecting USB power supply efficiency;
maximum voltage measurement support: 24V
maximum measurement current: 2.8A
support power display
* 3. Open source agreement
Open source agreement: GPL 3.0
 
*4. Hardware part
Main control part
Reset circuit, BOOT circuit
voltage sampling
 
 
 
*5. Software part
Compilation parameters
Compiler: ARM Compiler version 5 (-O0)
MDK version: 5.31
Debugger: ST-Link V2
Notes
If the sampled voltage or current is inaccurate, you can modify the values ​​of VOLTAGE_FACTOR and CURRENT_FACTOR in the main.c file according to the actual value. The specific calculation formula is:
VOLTAGE_FACTOR = actual voltage / displayed voltage
CURRENT_FACTOR = actual current / displayed current
*6. BOM list
 
*7. Competition LOGO verification
 
* 8. Demonstrate your project and record it as a video and upload it