#The7thLiChuangElectronicContest#Metoo USB Meter

Version introduction
V0.2 version improves PD QC detection deception
 
function introduction
TypeC input and output
bidirectional detection
PC communication (communication interface is USB serial port, sending timestamp, current and voltage string.)
PD detection deception
QC detection deception
voltage range 2V-20V
maximum detection current 8A, with temperature display
All hardware and software are open source
 
How to make one? ? ? Most of the resistors and capacitors
 
 
that need to be noted in the hardware part
are in 0402 package. If you find it difficult to weld, you can choose Jiali Chuang SMT patch
INA219. The price is very high now. If you don't have this, you may need to replace other chips
. R1, R37 are BOOT0 and BOOT1 pull-up resistors. Choose to weld
R42 as needed. Weld 0 ohm resistor or solder short-circuit. R41 is not welded.
The thickness of the PCB board is 1mm
(two MOS tubes and pull-down resistors can be unwelded)
(FLASH chip and capacitor are useless and can be unwelded)
SW5 toggle switch pin 2 is cut off and not welded (or you modify the PCB to remove the relevant circuits yourself)
Fix the hexagonal copper column M2*4
fixing screws flat head hexagonal stainless steel M2*3 + M2*8
two 4.7uH inductors are in 0603 package. I bought it, but it has not arrived for testing. The C87640 I use now has a larger package and can be squeezed in. I will test it when the 0603 arrives.
The pads on the side of the TypeC plug and socket are for reinforcement.

 
Some of the software
programs are open source.
Firmware development and

 
 
debugging are provided
. Debugging and serial port (bit number U9) are reserved. You can develop and debug by yourself.

 
 
If you don’t develop or debug, and there is no debugging tool, you just want to download the program and use it directly, that’s fine!
R1 is soldered with a 10k pull-up resistor, and R37 is not soldered .
The communication interface is connected to the computer.
Use Nations MCU Download Tool software to download the firmware (the firmware download software is provided in the attachment) to remove
the R1 resistor. Here is an example of the development board. The normal video demonstration when the chip information is different. B station demonstration video (appearance, interface, main function demonstration) V0.2 version https://www.bilibili.com/video/BV1VV4y1g7Ey/Photo display (Y65 is the production number of Jiali Chuang