#The 7th Lichuang Electric Competition#5V Ammeter

1. Introduction to project functions
 
1. Check the output voltage, current and power of the USB port
2. Support the input and output of the TYPE_C interface, and check the current, voltage and power of the interface (due to design defects, this function has not been fully realized!)
 
 
 
2. Project attributes
I completed the training camp for the first time, and I was a little excited
 
 
3. Open source protocol
circuit part is open source
 
 
4. The hardware part
uses two INA199A1DCKRs for current sampling of USB and TYPE_C interfaces, and a 90K and a 10K resistor are used for voltage sampling. The power supply uses UMW78L05, and the chip is naturally the N32G430C8L7 of National Technology. Secondly, there is a design defect that L3 and L4 must be replaced with two diodes with the lowest voltage drop, because this place is connected, resulting in voltage at the USB port and the type-c port when the voltage is sampled. The reason why the diode with the lowest voltage drop is because the voltage drop is low, the mcu can work normally, but the screen is dark. If you don't mind the trouble, you can also directly replace this route with a switch that can switch the circuit.
This is when it is working normally.
5. The software part
is based on the routine, so there is nothing much to say. In addition, I would like to thank hongs who has been helping me in this project.
 
6. BOM list
 
7. Competition LOGO verification
 
Please upload the project picture containing the competition logo. The logo is printed on the PCB in the form of silk screen.
Click zip to download the competition logo! (Competition logo).zip
8. Demonstrate your project and record it into a video. Upload
 
video requirements: Please shoot horizontally, with a resolution of not less than 1280×720, in Mp4/Mov format, and a single video size limited to 100M;
video title: Lichuang Electric Race: {Project Name}-{Video Module Name}; such as Lichuang Electric Race: "Autonomous Driving"-Team Introduction.
 
More details: https://diy.szlcsc.com/posts/d76d9cb41705430e9a54e7a5feed07a5