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#The7thLiChuangElectricityContest#USB Ammeter

Overview

Introduction
This is the 4-24V version of the official case, but when actually measured, the OLED screen cannot display normally when it is lower than 5V. Therefore, the electrical appliances directly plugged into the laptop cannot be measured... Currently tested, it is possible to measure within 10V, but it does not support the fast charging protocol, and it does not support high current. The PCB groove is not dug enough, and the 3D printed shell is not designed well and does not take into account the height of the pin header, but part of the pin header can be cut off.

![IMG_20220916_165804.jpg]

![IMG_20220916_170450.jpg]

![IMG_20220916_160517.jpg]

Display when not calibrated.

![IMG_20220916_165501.jpg]

Voltage calibration.

![IMG_20220916_165547.jpg]

Current calibration.

Design Files

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Update:2025-06-19 09:01:30

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