supremeOne

Cube-410_USB power meter

Overview

Cube -410_USB power meter

·USB power meter based on ESP32-U4WDH

The main control is ESP32-U4WDH

Support USB3.x gen1 transmission

Maximum current 10A (30 degree temperature rise)

Power supply range: 4.5v - 40v

Maximum measuring voltage: 36V

Screen: st7735 80*160

Data refresh: ~200fps (4ms-20ms)

Data collection: The collection speed depends on the data difference. After stabilization, it will be collected once every 4ms-5ms, and then displayed after first-order low-pass filtering.

Time: The display is accurate to 1ms, the storage/calculation accuracy is 1us, 64-bit unsigned integer, you can calculate the maximum time by yourself

Power: display accuracy 0.01mWh, maximum 999999.99mWh

Since 2.4Ghz and USB3’s 2.5Ghz are prone to interference, this version has the radio frequency circuit cut off.

One side will have a power consumption of 0.23W when it is unloaded. It is recommended that this side be used to measure the discharge of the power bank.

Note: It is recommended to use high-precision low-temperature drift for the sampling resistor.

Program burning: only supports Cube-esp-tool fast burning interface

Burning command:

esptool.py --chip esp32 --port (PORT) --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 80m --flash_size detect 0xe000 boot_app0.bin 0x1000 bootloader_dio_80m.bin 0x10000 USBPower.ino.bin 0x8000 USBPower.ino.partitions.bin

(PORT) Depends on operating system and burning method, for example:

/	Manual USB burning	Cube-esp-tool fast burning
Linux	/dev/ttyACM[X]	/dev/ttyUSB[X]
Windows	COM[X]	COM[X]

The file and address in the corresponding command burned by the GUI

2022.3.4 Ver1.1 firmware update
- Add running days display
- Optimize refresh speed

2022.3.4: Subsequent versions will be placed in the group file (not created yet)

There are many people asking questions in private messages. Here is a unified reply: I really don’t have time recently. I will wait until the college entrance examination is over. If you have any questions, you can figure it out on your own.

PS: The fast burning function of this project is abnormal. The IO0 pull-down time is too short. When burning, you need to manually pull down IO0 or temporarily modify the pull-down time of esptool.py.

Design Files

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Update:2025-05-08 15:17:31

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