Somnos

IoT USB power measurement and on/off switch.

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The device has USB C input and standard USB A output.

It is capable of measuring USB bus voltage, current and power as well as switching the power on and off.

When requested, the measurement result can be sent over ethernet (UDP) to a receiver, for example to a PC.

⚠️ Power consumed by the device itself is also included in this measurement, which may be unwanted in some use cases.

Building Firmware

Setup build environment:

./project.py submodules
./project.py setup

Build the project:

./project.py build

Hardware Used

• Raspberry Pi Pico microcontroller,
• INA219 I2C Current/Power Monitor breakout board,
• Enc28J60 Ethernet Controller board,
• MOSFET breakout board,
• Custom breakout PCB,
• 3D printed enclosure and 4 M3x8 screws.